diff --git a/packages/react-devtools-extensions/src/SourceMapMetadataConsumer.js b/packages/react-devtools-extensions/src/SourceMapMetadataConsumer.js
new file mode 100644
index 0000000000000..e42fd9e0bc466
--- /dev/null
+++ b/packages/react-devtools-extensions/src/SourceMapMetadataConsumer.js
@@ -0,0 +1,197 @@
+/*
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow strict-local
+ */
+
+import type {Position} from './astUtils';
+import type {
+  ReactSourceMetadata,
+  IndexSourceMap,
+  BasicSourceMap,
+  MixedSourceMap,
+} from './SourceMapTypes';
+import type {HookMap} from './generateHookMap';
+import * as util from 'source-map/lib/util';
+import {decodeHookMap} from './generateHookMap';
+import {getHookNameForLocation} from './getHookNameForLocation';
+
+type MetadataMap = Map<string, ?ReactSourceMetadata>;
+
+const HOOK_MAP_INDEX_IN_REACT_METADATA = 0;
+const REACT_METADATA_INDEX_IN_FB_METADATA = 1;
+const REACT_SOURCES_EXTENSION_KEY = 'x_react_sources';
+const FB_SOURCES_EXTENSION_KEY = 'x_facebook_sources';
+
+/**
+ * Extracted from the logic in source-map@0.8.0-beta.0's SourceMapConsumer.
+ * By default, source names are normalized using the same logic that the
+ * `source-map@0.8.0-beta.0` package uses internally. This is crucial for keeping the
+ * sources list in sync with a `SourceMapConsumer` instance.
+ */
+function normalizeSourcePath(
+  sourceInput: string,
+  map: {+sourceRoot?: ?string, ...},
+): string {
+  const {sourceRoot} = map;
+  let source = sourceInput;
+
+  // eslint-disable-next-line react-internal/no-primitive-constructors
+  source = String(source);
+  return util.computeSourceURL(sourceRoot, source);
+}
+
+/**
+ * Consumes the `x_react_sources` or  `x_facebook_sources` metadata field from a
+ * source map and exposes ways to query the React DevTools specific metadata
+ * included in those fields.
+ */
+export class SourceMapMetadataConsumer {
+  _sourceMap: MixedSourceMap;
+  _decodedHookMapCache: Map<string, HookMap>;
+  _metadataBySource: ?MetadataMap;
+
+  constructor(sourcemap: MixedSourceMap) {
+    this._sourceMap = sourcemap;
+    this._decodedHookMapCache = new Map();
+    this._metadataBySource = null;
+  }
+
+  /**
+   * Returns the Hook name assigned to a given location in the source code,
+   * and a HookMap extracted from an extended source map.
+   * See `getHookNameForLocation` for more details on implementation.
+   *
+   * When used with the `source-map` package, you'll first use
+   * `SourceMapConsumer#originalPositionFor` to retrieve a source location,
+   * then pass that location to `hookNameFor`.
+   */
+  hookNameFor({
+    line,
+    column,
+    source,
+  }: {|
+    ...Position,
+    +source: ?string,
+  |}): ?string {
+    if (source == null) {
+      return null;
+    }
+
+    const hookMap = this._getHookMapForSource(source);
+    if (hookMap == null) {
+      return null;
+    }
+
+    return getHookNameForLocation({line, column}, hookMap);
+  }
+
+  hasHookMap(source: ?string) {
+    if (source == null) {
+      return null;
+    }
+    return this._getHookMapForSource(source) != null;
+  }
+
+  /**
+   * Prepares and caches a lookup table of metadata by source name.
+   */
+  _getMetadataBySource(): MetadataMap {
+    if (this._metadataBySource == null) {
+      this._metadataBySource = this._getMetadataObjectsBySourceNames(
+        this._sourceMap,
+      );
+    }
+
+    return this._metadataBySource;
+  }
+
+  /**
+   * Collects source metadata from the given map using the current source name
+   * normalization function. Handles both index maps (with sections) and plain
+   * maps.
+   *
+   * NOTE: If any sources are repeated in the map (which shouldn't usually happen,
+   * but is technically possible because of index maps) we only keep the
+   * metadata from the last occurrence of any given source.
+   */
+  _getMetadataObjectsBySourceNames(sourcemap: MixedSourceMap): MetadataMap {
+    if (sourcemap.mappings === undefined) {
+      const indexSourceMap: IndexSourceMap = sourcemap;
+      const metadataMap = new Map();
+      indexSourceMap.sections.forEach(section => {
+        const metadataMapForIndexMap = this._getMetadataObjectsBySourceNames(
+          section.map,
+        );
+        metadataMapForIndexMap.forEach((value, key) => {
+          metadataMap.set(key, value);
+        });
+      });
+      return metadataMap;
+    }
+
+    const metadataMap = new Map();
+    const basicMap: BasicSourceMap = sourcemap;
+    const updateMap = (metadata: ReactSourceMetadata, sourceIndex: number) => {
+      let source = basicMap.sources[sourceIndex];
+      if (source != null) {
+        source = normalizeSourcePath(source, basicMap);
+        metadataMap.set(source, metadata);
+      }
+    };
+
+    if (
+      sourcemap.hasOwnProperty(REACT_SOURCES_EXTENSION_KEY) &&
+      sourcemap[REACT_SOURCES_EXTENSION_KEY] != null
+    ) {
+      const reactMetadataArray = sourcemap[REACT_SOURCES_EXTENSION_KEY];
+      reactMetadataArray.filter(Boolean).forEach(updateMap);
+    } else if (
+      sourcemap.hasOwnProperty(FB_SOURCES_EXTENSION_KEY) &&
+      sourcemap[FB_SOURCES_EXTENSION_KEY] != null
+    ) {
+      const fbMetadataArray = sourcemap[FB_SOURCES_EXTENSION_KEY];
+      if (fbMetadataArray != null) {
+        fbMetadataArray.forEach((fbMetadata, sourceIndex) => {
+          // When extending source maps with React metadata using the
+          // x_facebook_sources field, the position at index 1 on the
+          // metadata tuple is reserved for React metadata
+          const reactMetadata =
+            fbMetadata != null
+              ? fbMetadata[REACT_METADATA_INDEX_IN_FB_METADATA]
+              : null;
+          if (reactMetadata != null) {
+            updateMap(reactMetadata, sourceIndex);
+          }
+        });
+      }
+    }
+
+    return metadataMap;
+  }
+
+  /**
+   * Decodes the function name mappings for the given source if needed, and
+   * retrieves a sorted, searchable array of mappings.
+   */
+  _getHookMapForSource(source: string): ?HookMap {
+    if (this._decodedHookMapCache.has(source)) {
+      return this._decodedHookMapCache.get(source);
+    }
+    let hookMap = null;
+    const metadataBySource = this._getMetadataBySource();
+    const normalized = normalizeSourcePath(source, this._sourceMap);
+    const metadata = metadataBySource.get(normalized);
+    if (metadata != null) {
+      const encodedHookMap = metadata[HOOK_MAP_INDEX_IN_REACT_METADATA];
+      hookMap = encodedHookMap != null ? decodeHookMap(encodedHookMap) : null;
+    }
+    if (hookMap != null) {
+      this._decodedHookMapCache.set(source, hookMap);
+    }
+    return hookMap;
+  }
+}
diff --git a/packages/react-devtools-extensions/src/SourceMapTypes.js b/packages/react-devtools-extensions/src/SourceMapTypes.js
index 6e6d62580d2ab..744cc7d309251 100644
--- a/packages/react-devtools-extensions/src/SourceMapTypes.js
+++ b/packages/react-devtools-extensions/src/SourceMapTypes.js
@@ -27,8 +27,8 @@ export type BasicSourceMap = {|
   +x_react_sources?: ReactSourcesArray,
 |};
 
-export type IndexMapSection = {
-  map: IndexMap | BasicSourceMap,
+export type IndexSourceMapSection = {
+  map: IndexSourceMap | BasicSourceMap,
   offset: {
     line: number,
     column: number,
@@ -37,14 +37,14 @@ export type IndexMapSection = {
   ...
 };
 
-export type IndexMap = {|
+export type IndexSourceMap = {|
   +file?: string,
   +mappings?: void, // avoids SourceMap being a disjoint union
   +sourcesContent?: void,
-  +sections: Array<IndexMapSection>,
+  +sections: Array<IndexSourceMapSection>,
   +version: number,
   +x_facebook_sources?: FBSourcesArray,
   +x_react_sources?: ReactSourcesArray,
 |};
 
-export type MixedSourceMap = IndexMap | BasicSourceMap;
+export type MixedSourceMap = IndexSourceMap | BasicSourceMap;
diff --git a/packages/react-devtools-extensions/src/SourceMapUtils.js b/packages/react-devtools-extensions/src/SourceMapUtils.js
new file mode 100644
index 0000000000000..008a1821487e6
--- /dev/null
+++ b/packages/react-devtools-extensions/src/SourceMapUtils.js
@@ -0,0 +1,34 @@
+/*
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow strict-local
+ */
+
+import type {
+  BasicSourceMap,
+  MixedSourceMap,
+  IndexSourceMap,
+} from './SourceMapTypes';
+
+export function sourceMapIncludesSource(
+  sourcemap: MixedSourceMap,
+  source: ?string,
+): boolean {
+  if (source == null) {
+    return false;
+  }
+  if (sourcemap.mappings === undefined) {
+    const indexSourceMap: IndexSourceMap = sourcemap;
+    return indexSourceMap.sections.some(section => {
+      return sourceMapIncludesSource(section.map, source);
+    });
+  }
+
+  const basicMap: BasicSourceMap = sourcemap;
+  return basicMap.sources.some(
+    s => s === 'Inline Babel script' || source.endsWith(s),
+  );
+}
diff --git a/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/fb-sources-extended/index-map/ComponentUsingHooksIndirectly.js b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/fb-sources-extended/index-map/ComponentUsingHooksIndirectly.js
new file mode 100644
index 0000000000000..6925712d17c7c
--- /dev/null
+++ b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/fb-sources-extended/index-map/ComponentUsingHooksIndirectly.js
@@ -0,0 +1,45 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.Component = Component;
+
+var _react = _interopRequireWildcard(require("react"));
+
+function _getRequireWildcardCache() { if (typeof WeakMap !== "function") return null; var cache = new WeakMap(); _getRequireWildcardCache = function () { return cache; }; return cache; }
+
+function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } if (obj === null || typeof obj !== "object" && typeof obj !== "function") { return { default: obj }; } var cache = _getRequireWildcardCache(); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) { var desc = hasPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : null; if (desc && (desc.get || desc.set)) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } newObj.default = obj; if (cache) { cache.set(obj, newObj); } return newObj; }
+
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow
+ */
+function Component() {
+  const countState = (0, _react.useState)(0);
+  const count = countState[0];
+  const setCount = countState[1];
+  const darkMode = useIsDarkMode();
+  const [isDarkMode] = darkMode;
+  (0, _react.useEffect)(() => {// ...
+  }, []);
+
+  const handleClick = () => setCount(count + 1);
+
+  return /*#__PURE__*/_react.default.createElement(_react.default.Fragment, null, /*#__PURE__*/_react.default.createElement("div", null, "Dark mode? ", isDarkMode), /*#__PURE__*/_react.default.createElement("div", null, "Count: ", count), /*#__PURE__*/_react.default.createElement("button", {
+    onClick: handleClick
+  }, "Update count"));
+}
+
+function useIsDarkMode() {
+  const darkModeState = (0, _react.useState)(false);
+  const [isDarkMode] = darkModeState;
+  (0, _react.useEffect)(function useEffectCreate() {// Here is where we may listen to a "theme" event...
+  }, []);
+  return [isDarkMode, () => {}];
+}
+//# sourceMappingURL=ComponentUsingHooksIndirectly.js.map
\ No newline at end of file
diff --git a/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/fb-sources-extended/index-map/ComponentUsingHooksIndirectly.js.map b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/fb-sources-extended/index-map/ComponentUsingHooksIndirectly.js.map
new file mode 100644
index 0000000000000..376b695484d04
--- /dev/null
+++ b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/fb-sources-extended/index-map/ComponentUsingHooksIndirectly.js.map
@@ -0,0 +1 @@
+{"version":3,"sections":[{"offset":{"line":0,"column":0},"map":{"version":3,"sources":["ComponentUsingHooksIndirectly.js"],"names":["Component","countState","count","setCount","darkMode","useIsDarkMode","isDarkMode","handleClick","darkModeState","useEffectCreate"],"mappings":";;;;;;;AASA;;;;;;AATA;;;;;;;;AAWO,SAASA,SAAT,GAAqB;AAC1B,QAAMC,UAAU,GAAG,qBAAS,CAAT,CAAnB;AACA,QAAMC,KAAK,GAAGD,UAAU,CAAC,CAAD,CAAxB;AACA,QAAME,QAAQ,GAAGF,UAAU,CAAC,CAAD,CAA3B;AAEA,QAAMG,QAAQ,GAAGC,aAAa,EAA9B;AACA,QAAM,CAACC,UAAD,IAAeF,QAArB;AAEA,wBAAU,MAAM,CACd;AACD,GAFD,EAEG,EAFH;;AAIA,QAAMG,WAAW,GAAG,MAAMJ,QAAQ,CAACD,KAAK,GAAG,CAAT,CAAlC;;AAEA,sBACE,yEACE,yDAAiBI,UAAjB,CADF,eAEE,qDAAaJ,KAAb,CAFF,eAGE;AAAQ,IAAA,OAAO,EAAEK;AAAjB,oBAHF,CADF;AAOD;;AAED,SAASF,aAAT,GAAyB;AACvB,QAAMG,aAAa,GAAG,qBAAS,KAAT,CAAtB;AACA,QAAM,CAACF,UAAD,IAAeE,aAArB;AAEA,wBAAU,SAASC,eAAT,GAA2B,CACnC;AACD,GAFD,EAEG,EAFH;AAIA,SAAO,CAACH,UAAD,EAAa,MAAM,CAAE,CAArB,CAAP;AACD","sourcesContent":["/**\n * Copyright (c) Facebook, Inc. and its affiliates.\n *\n * This source code is licensed under the MIT license found in the\n * LICENSE file in the root directory of this source tree.\n *\n * @flow\n */\n\nimport React, {useEffect, useState} from 'react';\n\nexport function Component() {\n  const countState = useState(0);\n  const count = countState[0];\n  const setCount = countState[1];\n\n  const darkMode = useIsDarkMode();\n  const [isDarkMode] = darkMode;\n\n  useEffect(() => {\n    // ...\n  }, []);\n\n  const handleClick = () => setCount(count + 1);\n\n  return (\n    <>\n      <div>Dark mode? {isDarkMode}</div>\n      <div>Count: {count}</div>\n      <button onClick={handleClick}>Update count</button>\n    </>\n  );\n}\n\nfunction useIsDarkMode() {\n  const darkModeState = useState(false);\n  const [isDarkMode] = darkModeState;\n\n  useEffect(function useEffectCreate() {\n    // Here is where we may listen to a \"theme\" event...\n  }, []);\n\n  return [isDarkMode, () => {}];\n}\n"],"x_facebook_sources":[[null,[{"names":["<no-hook>","count","darkMode","isDarkMode"],"mappings":"CAAD;aqBCA,AWDA;iBbEA,AeFA;oCVGA,AeHA"}]]]}}]}
\ No newline at end of file
diff --git a/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/fb-sources-extended/index-map/ComponentWithCustomHook.js b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/fb-sources-extended/index-map/ComponentWithCustomHook.js
new file mode 100644
index 0000000000000..e326d7a4962d5
--- /dev/null
+++ b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/fb-sources-extended/index-map/ComponentWithCustomHook.js
@@ -0,0 +1,41 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.Component = Component;
+
+var _react = _interopRequireWildcard(require("react"));
+
+function _getRequireWildcardCache() { if (typeof WeakMap !== "function") return null; var cache = new WeakMap(); _getRequireWildcardCache = function () { return cache; }; return cache; }
+
+function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } if (obj === null || typeof obj !== "object" && typeof obj !== "function") { return { default: obj }; } var cache = _getRequireWildcardCache(); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) { var desc = hasPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : null; if (desc && (desc.get || desc.set)) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } newObj.default = obj; if (cache) { cache.set(obj, newObj); } return newObj; }
+
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow
+ */
+function Component() {
+  const [count, setCount] = (0, _react.useState)(0);
+  const isDarkMode = useIsDarkMode();
+  (0, _react.useEffect)(() => {// ...
+  }, []);
+
+  const handleClick = () => setCount(count + 1);
+
+  return /*#__PURE__*/_react.default.createElement(_react.default.Fragment, null, /*#__PURE__*/_react.default.createElement("div", null, "Dark mode? ", isDarkMode), /*#__PURE__*/_react.default.createElement("div", null, "Count: ", count), /*#__PURE__*/_react.default.createElement("button", {
+    onClick: handleClick
+  }, "Update count"));
+}
+
+function useIsDarkMode() {
+  const [isDarkMode] = (0, _react.useState)(false);
+  (0, _react.useEffect)(function useEffectCreate() {// Here is where we may listen to a "theme" event...
+  }, []);
+  return isDarkMode;
+}
+//# sourceMappingURL=ComponentWithCustomHook.js.map
\ No newline at end of file
diff --git a/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/fb-sources-extended/index-map/ComponentWithCustomHook.js.map b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/fb-sources-extended/index-map/ComponentWithCustomHook.js.map
new file mode 100644
index 0000000000000..a353f2d57c941
--- /dev/null
+++ b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/fb-sources-extended/index-map/ComponentWithCustomHook.js.map
@@ -0,0 +1 @@
+{"version":3,"sections":[{"offset":{"line":0,"column":0},"map":{"version":3,"sources":["ComponentWithCustomHook.js"],"names":["Component","count","setCount","isDarkMode","useIsDarkMode","handleClick","useEffectCreate"],"mappings":";;;;;;;AASA;;;;;;AATA;;;;;;;;AAWO,SAASA,SAAT,GAAqB;AAC1B,QAAM,CAACC,KAAD,EAAQC,QAAR,IAAoB,qBAAS,CAAT,CAA1B;AACA,QAAMC,UAAU,GAAGC,aAAa,EAAhC;AAEA,wBAAU,MAAM,CACd;AACD,GAFD,EAEG,EAFH;;AAIA,QAAMC,WAAW,GAAG,MAAMH,QAAQ,CAACD,KAAK,GAAG,CAAT,CAAlC;;AAEA,sBACE,yEACE,yDAAiBE,UAAjB,CADF,eAEE,qDAAaF,KAAb,CAFF,eAGE;AAAQ,IAAA,OAAO,EAAEI;AAAjB,oBAHF,CADF;AAOD;;AAED,SAASD,aAAT,GAAyB;AACvB,QAAM,CAACD,UAAD,IAAe,qBAAS,KAAT,CAArB;AAEA,wBAAU,SAASG,eAAT,GAA2B,CACnC;AACD,GAFD,EAEG,EAFH;AAIA,SAAOH,UAAP;AACD","sourcesContent":["/**\n * Copyright (c) Facebook, Inc. and its affiliates.\n *\n * This source code is licensed under the MIT license found in the\n * LICENSE file in the root directory of this source tree.\n *\n * @flow\n */\n\nimport React, {useEffect, useState} from 'react';\n\nexport function Component() {\n  const [count, setCount] = useState(0);\n  const isDarkMode = useIsDarkMode();\n\n  useEffect(() => {\n    // ...\n  }, []);\n\n  const handleClick = () => setCount(count + 1);\n\n  return (\n    <>\n      <div>Dark mode? {isDarkMode}</div>\n      <div>Count: {count}</div>\n      <button onClick={handleClick}>Update count</button>\n    </>\n  );\n}\n\nfunction useIsDarkMode() {\n  const [isDarkMode] = useState(false);\n\n  useEffect(function useEffectCreate() {\n    // Here is where we may listen to a \"theme\" event...\n  }, []);\n\n  return isDarkMode;\n}\n"],"x_facebook_sources":[[null,[{"names":["<no-hook>","count","isDarkMode"],"mappings":"CAAD;a4BCA,AWDA;clBEA,AeFA;gCbEA,AeFA"}]]]}}]}
\ No newline at end of file
diff --git a/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/fb-sources-extended/index-map/ComponentWithExternalCustomHooks.js b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/fb-sources-extended/index-map/ComponentWithExternalCustomHooks.js
new file mode 100644
index 0000000000000..05aedb938b715
--- /dev/null
+++ b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/fb-sources-extended/index-map/ComponentWithExternalCustomHooks.js
@@ -0,0 +1,26 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.Component = Component;
+
+var _react = _interopRequireDefault(require("react"));
+
+var _useTheme = _interopRequireDefault(require("./useTheme"));
+
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
+
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow
+ */
+function Component() {
+  const theme = (0, _useTheme.default)();
+  return /*#__PURE__*/_react.default.createElement("div", null, "theme: ", theme);
+}
+//# sourceMappingURL=ComponentWithExternalCustomHooks.js.map
\ No newline at end of file
diff --git a/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/fb-sources-extended/index-map/ComponentWithExternalCustomHooks.js.map b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/fb-sources-extended/index-map/ComponentWithExternalCustomHooks.js.map
new file mode 100644
index 0000000000000..2054964189586
--- /dev/null
+++ b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/fb-sources-extended/index-map/ComponentWithExternalCustomHooks.js.map
@@ -0,0 +1 @@
+{"version":3,"sections":[{"offset":{"line":0,"column":0},"map":{"version":3,"sources":["ComponentWithExternalCustomHooks.js"],"names":["Component","theme"],"mappings":";;;;;;;AASA;;AACA;;;;AAVA;;;;;;;;AAYO,SAASA,SAAT,GAAqB;AAC1B,QAAMC,KAAK,GAAG,wBAAd;AAEA,sBAAO,qDAAaA,KAAb,CAAP;AACD","sourcesContent":["/**\n * Copyright (c) Facebook, Inc. and its affiliates.\n *\n * This source code is licensed under the MIT license found in the\n * LICENSE file in the root directory of this source tree.\n *\n * @flow\n */\n\nimport React from 'react';\nimport useTheme from './useTheme';\n\nexport function Component() {\n  const theme = useTheme();\n\n  return <div>theme: {theme}</div>;\n}\n"],"x_facebook_sources":[[null,[{"names":["<no-hook>","theme"],"mappings":"CAAD;cgBCA,AUDA"}]]]}}]}
\ No newline at end of file
diff --git a/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/fb-sources-extended/index-map/ComponentWithMultipleHooksPerLine.js b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/fb-sources-extended/index-map/ComponentWithMultipleHooksPerLine.js
new file mode 100644
index 0000000000000..c657f3eb54551
--- /dev/null
+++ b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/fb-sources-extended/index-map/ComponentWithMultipleHooksPerLine.js
@@ -0,0 +1,30 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.Component = Component;
+
+var _react = require("react");
+
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow
+ */
+const A = /*#__PURE__*/(0, _react.createContext)(1);
+const B = /*#__PURE__*/(0, _react.createContext)(2);
+
+function Component() {
+  const a = (0, _react.useContext)(A);
+  const b = (0, _react.useContext)(B); // prettier-ignore
+
+  const c = (0, _react.useContext)(A),
+        d = (0, _react.useContext)(B); // eslint-disable-line one-var
+
+  return a + b + c + d;
+}
+//# sourceMappingURL=ComponentWithMultipleHooksPerLine.js.map
\ No newline at end of file
diff --git a/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/fb-sources-extended/index-map/ComponentWithMultipleHooksPerLine.js.map b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/fb-sources-extended/index-map/ComponentWithMultipleHooksPerLine.js.map
new file mode 100644
index 0000000000000..5ea03655141e9
--- /dev/null
+++ b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/fb-sources-extended/index-map/ComponentWithMultipleHooksPerLine.js.map
@@ -0,0 +1 @@
+{"version":3,"sections":[{"offset":{"line":0,"column":0},"map":{"version":3,"sources":["ComponentWithMultipleHooksPerLine.js"],"names":["A","B","Component","a","b","c","d"],"mappings":";;;;;;;AASA;;AATA;;;;;;;;AAWA,MAAMA,CAAC,gBAAG,0BAAc,CAAd,CAAV;AACA,MAAMC,CAAC,gBAAG,0BAAc,CAAd,CAAV;;AAEO,SAASC,SAAT,GAAqB;AAC1B,QAAMC,CAAC,GAAG,uBAAWH,CAAX,CAAV;AACA,QAAMI,CAAC,GAAG,uBAAWH,CAAX,CAAV,CAF0B,CAI1B;;AACA,QAAMI,CAAC,GAAG,uBAAWL,CAAX,CAAV;AAAA,QAAyBM,CAAC,GAAG,uBAAWL,CAAX,CAA7B,CAL0B,CAKkB;;AAE5C,SAAOE,CAAC,GAAGC,CAAJ,GAAQC,CAAR,GAAYC,CAAnB;AACD","sourcesContent":["/**\n * Copyright (c) Facebook, Inc. and its affiliates.\n *\n * This source code is licensed under the MIT license found in the\n * LICENSE file in the root directory of this source tree.\n *\n * @flow\n */\n\nimport {createContext, useContext} from 'react';\n\nconst A = createContext(1);\nconst B = createContext(2);\n\nexport function Component() {\n  const a = useContext(A);\n  const b = useContext(B);\n\n  // prettier-ignore\n  const c = useContext(A), d = useContext(B); // eslint-disable-line one-var\n\n  return a + b + c + d;\n}\n"],"x_facebook_sources":[[null,[{"names":["<no-hook>","a","b","c","d"],"mappings":"CAAD;gBYCA,AaDA;iBbEA,AaFA;oBbGA,AaHA,AMIA,AaJA"}]]]}}]}
\ No newline at end of file
diff --git a/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/fb-sources-extended/index-map/ComponentWithNestedHooks.js b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/fb-sources-extended/index-map/ComponentWithNestedHooks.js
new file mode 100644
index 0000000000000..3cfed69078a8c
--- /dev/null
+++ b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/fb-sources-extended/index-map/ComponentWithNestedHooks.js
@@ -0,0 +1,28 @@
+"use strict";
+
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow
+ */
+const {
+  useMemo,
+  useState
+} = require('react');
+
+function Component(props) {
+  const InnerComponent = useMemo(() => () => {
+    const [state] = useState(0);
+    return state;
+  });
+  props.callback(InnerComponent);
+  return null;
+}
+
+module.exports = {
+  Component
+};
+//# sourceMappingURL=ComponentWithNestedHooks.js.map
\ No newline at end of file
diff --git a/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/fb-sources-extended/index-map/ComponentWithNestedHooks.js.map b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/fb-sources-extended/index-map/ComponentWithNestedHooks.js.map
new file mode 100644
index 0000000000000..0e464041fa29d
--- /dev/null
+++ b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/fb-sources-extended/index-map/ComponentWithNestedHooks.js.map
@@ -0,0 +1 @@
+{"version":3,"sections":[{"offset":{"line":0,"column":0},"map":{"version":3,"sources":["ComponentWithNestedHooks.js"],"names":["useMemo","useState","require","Component","props","InnerComponent","state","callback","module","exports"],"mappings":";;AAAA;;;;;;;;AAQA,MAAM;AAACA,EAAAA,OAAD;AAAUC,EAAAA;AAAV,IAAsBC,OAAO,CAAC,OAAD,CAAnC;;AAEA,SAASC,SAAT,CAAmBC,KAAnB,EAA0B;AACxB,QAAMC,cAAc,GAAGL,OAAO,CAAC,MAAM,MAAM;AACzC,UAAM,CAACM,KAAD,IAAUL,QAAQ,CAAC,CAAD,CAAxB;AAEA,WAAOK,KAAP;AACD,GAJ6B,CAA9B;AAKAF,EAAAA,KAAK,CAACG,QAAN,CAAeF,cAAf;AAEA,SAAO,IAAP;AACD;;AAEDG,MAAM,CAACC,OAAP,GAAiB;AAACN,EAAAA;AAAD,CAAjB","sourcesContent":["/**\n * Copyright (c) Facebook, Inc. and its affiliates.\n *\n * This source code is licensed under the MIT license found in the\n * LICENSE file in the root directory of this source tree.\n *\n * @flow\n */\nconst {useMemo, useState} = require('react');\n\nfunction Component(props) {\n  const InnerComponent = useMemo(() => () => {\n    const [state] = useState(0);\n\n    return state;\n  });\n  props.callback(InnerComponent);\n\n  return null;\n}\n\nmodule.exports = {Component};\n"],"x_facebook_sources":[[null,[{"names":["<no-hook>","InnerComponent","state"],"mappings":"CAAD;YyBCA;aLCA,AWDA;gB3BDA"}]]]}}]}
\ No newline at end of file
diff --git a/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/fb-sources-extended/index-map/ContainingStringSourceMappingURL.js b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/fb-sources-extended/index-map/ContainingStringSourceMappingURL.js
new file mode 100644
index 0000000000000..0fc2c078ca125
--- /dev/null
+++ b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/fb-sources-extended/index-map/ContainingStringSourceMappingURL.js
@@ -0,0 +1,29 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.Component = Component;
+
+var _react = _interopRequireWildcard(require("react"));
+
+function _getRequireWildcardCache() { if (typeof WeakMap !== "function") return null; var cache = new WeakMap(); _getRequireWildcardCache = function () { return cache; }; return cache; }
+
+function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } if (obj === null || typeof obj !== "object" && typeof obj !== "function") { return { default: obj }; } var cache = _getRequireWildcardCache(); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) { var desc = hasPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : null; if (desc && (desc.get || desc.set)) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } newObj.default = obj; if (cache) { cache.set(obj, newObj); } return newObj; }
+
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow
+ */
+// ?sourceMappingURL=([^\s'"]+)/gm
+function Component() {
+  const [count, setCount] = (0, _react.useState)(0);
+  return /*#__PURE__*/_react.default.createElement("div", null, /*#__PURE__*/_react.default.createElement("p", null, "You clicked ", count, " times"), /*#__PURE__*/_react.default.createElement("button", {
+    onClick: () => setCount(count + 1)
+  }, "Click me"));
+}
+//# sourceMappingURL=ContainingStringSourceMappingURL.js.map
\ No newline at end of file
diff --git a/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/fb-sources-extended/index-map/ContainingStringSourceMappingURL.js.map b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/fb-sources-extended/index-map/ContainingStringSourceMappingURL.js.map
new file mode 100644
index 0000000000000..6dbada848ae73
--- /dev/null
+++ b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/fb-sources-extended/index-map/ContainingStringSourceMappingURL.js.map
@@ -0,0 +1 @@
+{"version":3,"sections":[{"offset":{"line":0,"column":0},"map":{"version":3,"sources":["ContainingStringSourceMappingURL.js"],"names":["Component","count","setCount"],"mappings":";;;;;;;AASA;;;;;;AATA;;;;;;;;AAWA;AAEO,SAASA,SAAT,GAAqB;AAC1B,QAAM,CAACC,KAAD,EAAQC,QAAR,IAAoB,qBAAS,CAAT,CAA1B;AAEA,sBACE,uDACE,wDAAgBD,KAAhB,WADF,eAEE;AAAQ,IAAA,OAAO,EAAE,MAAMC,QAAQ,CAACD,KAAK,GAAG,CAAT;AAA/B,gBAFF,CADF;AAMD","sourcesContent":["/**\n * Copyright (c) Facebook, Inc. and its affiliates.\n *\n * This source code is licensed under the MIT license found in the\n * LICENSE file in the root directory of this source tree.\n *\n * @flow\n */\n\nimport React, {useState} from 'react';\n\n// ?sourceMappingURL=([^\\s'\"]+)/gm\n\nexport function Component() {\n  const [count, setCount] = useState(0);\n\n  return (\n    <div>\n      <p>You clicked {count} times</p>\n      <button onClick={() => setCount(count + 1)}>Click me</button>\n    </div>\n  );\n}\n"],"x_facebook_sources":[[null,[{"names":["<no-hook>","count"],"mappings":"CAAD;e4BCA,AWDA"}]]]}}]}
\ No newline at end of file
diff --git a/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/fb-sources-extended/index-map/Example.js b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/fb-sources-extended/index-map/Example.js
new file mode 100644
index 0000000000000..19134738824bc
--- /dev/null
+++ b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/fb-sources-extended/index-map/Example.js
@@ -0,0 +1,28 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.Component = Component;
+
+var _react = _interopRequireWildcard(require("react"));
+
+function _getRequireWildcardCache() { if (typeof WeakMap !== "function") return null; var cache = new WeakMap(); _getRequireWildcardCache = function () { return cache; }; return cache; }
+
+function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } if (obj === null || typeof obj !== "object" && typeof obj !== "function") { return { default: obj }; } var cache = _getRequireWildcardCache(); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) { var desc = hasPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : null; if (desc && (desc.get || desc.set)) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } newObj.default = obj; if (cache) { cache.set(obj, newObj); } return newObj; }
+
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow
+ */
+function Component() {
+  const [count, setCount] = (0, _react.useState)(0);
+  return /*#__PURE__*/_react.default.createElement("div", null, /*#__PURE__*/_react.default.createElement("p", null, "You clicked ", count, " times"), /*#__PURE__*/_react.default.createElement("button", {
+    onClick: () => setCount(count + 1)
+  }, "Click me"));
+}
+//# sourceMappingURL=Example.js.map
\ No newline at end of file
diff --git a/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/fb-sources-extended/index-map/Example.js.map b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/fb-sources-extended/index-map/Example.js.map
new file mode 100644
index 0000000000000..bb88b19f6f3f1
--- /dev/null
+++ b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/fb-sources-extended/index-map/Example.js.map
@@ -0,0 +1 @@
+{"version":3,"sections":[{"offset":{"line":0,"column":0},"map":{"version":3,"sources":["Example.js"],"names":["Component","count","setCount"],"mappings":";;;;;;;AASA;;;;;;AATA;;;;;;;;AAWO,SAASA,SAAT,GAAqB;AAC1B,QAAM,CAACC,KAAD,EAAQC,QAAR,IAAoB,qBAAS,CAAT,CAA1B;AAEA,sBACE,uDACE,wDAAgBD,KAAhB,WADF,eAEE;AAAQ,IAAA,OAAO,EAAE,MAAMC,QAAQ,CAACD,KAAK,GAAG,CAAT;AAA/B,gBAFF,CADF;AAMD","sourcesContent":["/**\n * Copyright (c) Facebook, Inc. and its affiliates.\n *\n * This source code is licensed under the MIT license found in the\n * LICENSE file in the root directory of this source tree.\n *\n * @flow\n */\n\nimport React, {useState} from 'react';\n\nexport function Component() {\n  const [count, setCount] = useState(0);\n\n  return (\n    <div>\n      <p>You clicked {count} times</p>\n      <button onClick={() => setCount(count + 1)}>Click me</button>\n    </div>\n  );\n}\n"],"x_facebook_sources":[[null,[{"names":["<no-hook>","count"],"mappings":"CAAD;a4BCA,AWDA"}]]]}}]}
\ No newline at end of file
diff --git a/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/fb-sources-extended/index-map/InlineRequire.js b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/fb-sources-extended/index-map/InlineRequire.js
new file mode 100644
index 0000000000000..388aeda62b308
--- /dev/null
+++ b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/fb-sources-extended/index-map/InlineRequire.js
@@ -0,0 +1,21 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.Component = Component;
+
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow
+ */
+function Component() {
+  const [count] = require('react').useState(0);
+
+  return count;
+}
+//# sourceMappingURL=InlineRequire.js.map
\ No newline at end of file
diff --git a/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/fb-sources-extended/index-map/InlineRequire.js.map b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/fb-sources-extended/index-map/InlineRequire.js.map
new file mode 100644
index 0000000000000..3e5f5eadbccd5
--- /dev/null
+++ b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/fb-sources-extended/index-map/InlineRequire.js.map
@@ -0,0 +1 @@
+{"version":3,"sections":[{"offset":{"line":0,"column":0},"map":{"version":3,"sources":["InlineRequire.js"],"names":["Component","count","require","useState"],"mappings":";;;;;;;AAAA;;;;;;;;AASO,SAASA,SAAT,GAAqB;AAC1B,QAAM,CAACC,KAAD,IAAUC,OAAO,CAAC,OAAD,CAAP,CAAiBC,QAAjB,CAA0B,CAA1B,CAAhB;;AAEA,SAAOF,KAAP;AACD","sourcesContent":["/**\n * Copyright (c) Facebook, Inc. and its affiliates.\n *\n * This source code is licensed under the MIT license found in the\n * LICENSE file in the root directory of this source tree.\n *\n * @flow\n */\n\nexport function Component() {\n  const [count] = require('react').useState(0);\n\n  return count;\n}\n"],"x_facebook_sources":[[null,[{"names":["<no-hook>"],"mappings":"CAAD"}]]]}}]}
\ No newline at end of file
diff --git a/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/fb-sources-extended/index-map/ToDoList.js b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/fb-sources-extended/index-map/ToDoList.js
new file mode 100644
index 0000000000000..a6eb863b661ff
--- /dev/null
+++ b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/fb-sources-extended/index-map/ToDoList.js
@@ -0,0 +1,106 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.ListItem = ListItem;
+exports.List = List;
+
+var React = _interopRequireWildcard(require("react"));
+
+function _getRequireWildcardCache() { if (typeof WeakMap !== "function") return null; var cache = new WeakMap(); _getRequireWildcardCache = function () { return cache; }; return cache; }
+
+function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } if (obj === null || typeof obj !== "object" && typeof obj !== "function") { return { default: obj }; } var cache = _getRequireWildcardCache(); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) { var desc = hasPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : null; if (desc && (desc.get || desc.set)) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } newObj.default = obj; if (cache) { cache.set(obj, newObj); } return newObj; }
+
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow
+ */
+function ListItem({
+  item,
+  removeItem,
+  toggleItem
+}) {
+  const handleDelete = (0, React.useCallback)(() => {
+    removeItem(item);
+  }, [item, removeItem]);
+  const handleToggle = (0, React.useCallback)(() => {
+    toggleItem(item);
+  }, [item, toggleItem]);
+  return /*#__PURE__*/React.createElement("li", null, /*#__PURE__*/React.createElement("button", {
+    onClick: handleDelete
+  }, "Delete"), /*#__PURE__*/React.createElement("label", null, /*#__PURE__*/React.createElement("input", {
+    checked: item.isComplete,
+    onChange: handleToggle,
+    type: "checkbox"
+  }), ' ', item.text));
+}
+
+function List(props) {
+  const [newItemText, setNewItemText] = (0, React.useState)('');
+  const [items, setItems] = (0, React.useState)([{
+    id: 1,
+    isComplete: true,
+    text: 'First'
+  }, {
+    id: 2,
+    isComplete: true,
+    text: 'Second'
+  }, {
+    id: 3,
+    isComplete: false,
+    text: 'Third'
+  }]);
+  const [uid, setUID] = (0, React.useState)(4);
+  const handleClick = (0, React.useCallback)(() => {
+    if (newItemText !== '') {
+      setItems([...items, {
+        id: uid,
+        isComplete: false,
+        text: newItemText
+      }]);
+      setUID(uid + 1);
+      setNewItemText('');
+    }
+  }, [newItemText, items, uid]);
+  const handleKeyPress = (0, React.useCallback)(event => {
+    if (event.key === 'Enter') {
+      handleClick();
+    }
+  }, [handleClick]);
+  const handleChange = (0, React.useCallback)(event => {
+    setNewItemText(event.currentTarget.value);
+  }, [setNewItemText]);
+  const removeItem = (0, React.useCallback)(itemToRemove => setItems(items.filter(item => item !== itemToRemove)), [items]);
+  const toggleItem = (0, React.useCallback)(itemToToggle => {
+    // Dont use indexOf()
+    // because editing props in DevTools creates a new Object.
+    const index = items.findIndex(item => item.id === itemToToggle.id);
+    setItems(items.slice(0, index).concat({ ...itemToToggle,
+      isComplete: !itemToToggle.isComplete
+    }).concat(items.slice(index + 1)));
+  }, [items]);
+  return /*#__PURE__*/React.createElement(React.Fragment, null, /*#__PURE__*/React.createElement("h1", null, "List"), /*#__PURE__*/React.createElement("input", {
+    type: "text",
+    placeholder: "New list item...",
+    value: newItemText,
+    onChange: handleChange,
+    onKeyPress: handleKeyPress
+  }), /*#__PURE__*/React.createElement("button", {
+    disabled: newItemText === '',
+    onClick: handleClick
+  }, /*#__PURE__*/React.createElement("span", {
+    role: "img",
+    "aria-label": "Add item"
+  }, "Add")), /*#__PURE__*/React.createElement("ul", null, items.map(item => /*#__PURE__*/React.createElement(ListItem, {
+    key: item.id,
+    item: item,
+    removeItem: removeItem,
+    toggleItem: toggleItem
+  }))));
+}
+//# sourceMappingURL=ToDoList.js.map
\ No newline at end of file
diff --git a/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/fb-sources-extended/index-map/ToDoList.js.map b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/fb-sources-extended/index-map/ToDoList.js.map
new file mode 100644
index 0000000000000..ca334da523484
--- /dev/null
+++ b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/fb-sources-extended/index-map/ToDoList.js.map
@@ -0,0 +1 @@
+{"version":3,"sections":[{"offset":{"line":0,"column":0},"map":{"version":3,"sources":["ToDoList.js"],"names":["ListItem","item","removeItem","toggleItem","handleDelete","handleToggle","isComplete","text","List","props","newItemText","setNewItemText","items","setItems","id","uid","setUID","handleClick","handleKeyPress","event","key","handleChange","currentTarget","value","itemToRemove","filter","itemToToggle","index","findIndex","slice","concat","map"],"mappings":";;;;;;;;AASA;;;;;;AATA;;;;;;;;AAYO,SAASA,QAAT,CAAkB;AAACC,EAAAA,IAAD;AAAOC,EAAAA,UAAP;AAAmBC,EAAAA;AAAnB,CAAlB,EAAkD;AACvD,QAAMC,YAAY,GAAG,uBAAY,MAAM;AACrCF,IAAAA,UAAU,CAACD,IAAD,CAAV;AACD,GAFoB,EAElB,CAACA,IAAD,EAAOC,UAAP,CAFkB,CAArB;AAIA,QAAMG,YAAY,GAAG,uBAAY,MAAM;AACrCF,IAAAA,UAAU,CAACF,IAAD,CAAV;AACD,GAFoB,EAElB,CAACA,IAAD,EAAOE,UAAP,CAFkB,CAArB;AAIA,sBACE,6CACE;AAAQ,IAAA,OAAO,EAAEC;AAAjB,cADF,eAEE,gDACE;AACE,IAAA,OAAO,EAAEH,IAAI,CAACK,UADhB;AAEE,IAAA,QAAQ,EAAED,YAFZ;AAGE,IAAA,IAAI,EAAC;AAHP,IADF,EAKK,GALL,EAMGJ,IAAI,CAACM,IANR,CAFF,CADF;AAaD;;AAEM,SAASC,IAAT,CAAcC,KAAd,EAAqB;AAC1B,QAAM,CAACC,WAAD,EAAcC,cAAd,IAAgC,oBAAS,EAAT,CAAtC;AACA,QAAM,CAACC,KAAD,EAAQC,QAAR,IAAoB,oBAAS,CACjC;AAACC,IAAAA,EAAE,EAAE,CAAL;AAAQR,IAAAA,UAAU,EAAE,IAApB;AAA0BC,IAAAA,IAAI,EAAE;AAAhC,GADiC,EAEjC;AAACO,IAAAA,EAAE,EAAE,CAAL;AAAQR,IAAAA,UAAU,EAAE,IAApB;AAA0BC,IAAAA,IAAI,EAAE;AAAhC,GAFiC,EAGjC;AAACO,IAAAA,EAAE,EAAE,CAAL;AAAQR,IAAAA,UAAU,EAAE,KAApB;AAA2BC,IAAAA,IAAI,EAAE;AAAjC,GAHiC,CAAT,CAA1B;AAKA,QAAM,CAACQ,GAAD,EAAMC,MAAN,IAAgB,oBAAS,CAAT,CAAtB;AAEA,QAAMC,WAAW,GAAG,uBAAY,MAAM;AACpC,QAAIP,WAAW,KAAK,EAApB,EAAwB;AACtBG,MAAAA,QAAQ,CAAC,CACP,GAAGD,KADI,EAEP;AACEE,QAAAA,EAAE,EAAEC,GADN;AAEET,QAAAA,UAAU,EAAE,KAFd;AAGEC,QAAAA,IAAI,EAAEG;AAHR,OAFO,CAAD,CAAR;AAQAM,MAAAA,MAAM,CAACD,GAAG,GAAG,CAAP,CAAN;AACAJ,MAAAA,cAAc,CAAC,EAAD,CAAd;AACD;AACF,GAbmB,EAajB,CAACD,WAAD,EAAcE,KAAd,EAAqBG,GAArB,CAbiB,CAApB;AAeA,QAAMG,cAAc,GAAG,uBACrBC,KAAK,IAAI;AACP,QAAIA,KAAK,CAACC,GAAN,KAAc,OAAlB,EAA2B;AACzBH,MAAAA,WAAW;AACZ;AACF,GALoB,EAMrB,CAACA,WAAD,CANqB,CAAvB;AASA,QAAMI,YAAY,GAAG,uBACnBF,KAAK,IAAI;AACPR,IAAAA,cAAc,CAACQ,KAAK,CAACG,aAAN,CAAoBC,KAArB,CAAd;AACD,GAHkB,EAInB,CAACZ,cAAD,CAJmB,CAArB;AAOA,QAAMT,UAAU,GAAG,uBACjBsB,YAAY,IAAIX,QAAQ,CAACD,KAAK,CAACa,MAAN,CAAaxB,IAAI,IAAIA,IAAI,KAAKuB,YAA9B,CAAD,CADP,EAEjB,CAACZ,KAAD,CAFiB,CAAnB;AAKA,QAAMT,UAAU,GAAG,uBACjBuB,YAAY,IAAI;AACd;AACA;AACA,UAAMC,KAAK,GAAGf,KAAK,CAACgB,SAAN,CAAgB3B,IAAI,IAAIA,IAAI,CAACa,EAAL,KAAYY,YAAY,CAACZ,EAAjD,CAAd;AAEAD,IAAAA,QAAQ,CACND,KAAK,CACFiB,KADH,CACS,CADT,EACYF,KADZ,EAEGG,MAFH,CAEU,EACN,GAAGJ,YADG;AAENpB,MAAAA,UAAU,EAAE,CAACoB,YAAY,CAACpB;AAFpB,KAFV,EAMGwB,MANH,CAMUlB,KAAK,CAACiB,KAAN,CAAYF,KAAK,GAAG,CAApB,CANV,CADM,CAAR;AASD,GAfgB,EAgBjB,CAACf,KAAD,CAhBiB,CAAnB;AAmBA,sBACE,oBAAC,cAAD,qBACE,uCADF,eAEE;AACE,IAAA,IAAI,EAAC,MADP;AAEE,IAAA,WAAW,EAAC,kBAFd;AAGE,IAAA,KAAK,EAAEF,WAHT;AAIE,IAAA,QAAQ,EAAEW,YAJZ;AAKE,IAAA,UAAU,EAAEH;AALd,IAFF,eASE;AAAQ,IAAA,QAAQ,EAAER,WAAW,KAAK,EAAlC;AAAsC,IAAA,OAAO,EAAEO;AAA/C,kBACE;AAAM,IAAA,IAAI,EAAC,KAAX;AAAiB,kBAAW;AAA5B,WADF,CATF,eAcE,gCACGL,KAAK,CAACmB,GAAN,CAAU9B,IAAI,iBACb,oBAAC,QAAD;AACE,IAAA,GAAG,EAAEA,IAAI,CAACa,EADZ;AAEE,IAAA,IAAI,EAAEb,IAFR;AAGE,IAAA,UAAU,EAAEC,UAHd;AAIE,IAAA,UAAU,EAAEC;AAJd,IADD,CADH,CAdF,CADF;AA2BD","sourcesContent":["/**\n * Copyright (c) Facebook, Inc. and its affiliates.\n *\n * This source code is licensed under the MIT license found in the\n * LICENSE file in the root directory of this source tree.\n *\n * @flow\n */\n\nimport * as React from 'react';\nimport {Fragment, useCallback, useState} from 'react';\n\nexport function ListItem({item, removeItem, toggleItem}) {\n  const handleDelete = useCallback(() => {\n    removeItem(item);\n  }, [item, removeItem]);\n\n  const handleToggle = useCallback(() => {\n    toggleItem(item);\n  }, [item, toggleItem]);\n\n  return (\n    <li>\n      <button onClick={handleDelete}>Delete</button>\n      <label>\n        <input\n          checked={item.isComplete}\n          onChange={handleToggle}\n          type=\"checkbox\"\n        />{' '}\n        {item.text}\n      </label>\n    </li>\n  );\n}\n\nexport function List(props) {\n  const [newItemText, setNewItemText] = useState('');\n  const [items, setItems] = useState([\n    {id: 1, isComplete: true, text: 'First'},\n    {id: 2, isComplete: true, text: 'Second'},\n    {id: 3, isComplete: false, text: 'Third'},\n  ]);\n  const [uid, setUID] = useState(4);\n\n  const handleClick = useCallback(() => {\n    if (newItemText !== '') {\n      setItems([\n        ...items,\n        {\n          id: uid,\n          isComplete: false,\n          text: newItemText,\n        },\n      ]);\n      setUID(uid + 1);\n      setNewItemText('');\n    }\n  }, [newItemText, items, uid]);\n\n  const handleKeyPress = useCallback(\n    event => {\n      if (event.key === 'Enter') {\n        handleClick();\n      }\n    },\n    [handleClick],\n  );\n\n  const handleChange = useCallback(\n    event => {\n      setNewItemText(event.currentTarget.value);\n    },\n    [setNewItemText],\n  );\n\n  const removeItem = useCallback(\n    itemToRemove => setItems(items.filter(item => item !== itemToRemove)),\n    [items],\n  );\n\n  const toggleItem = useCallback(\n    itemToToggle => {\n      // Dont use indexOf()\n      // because editing props in DevTools creates a new Object.\n      const index = items.findIndex(item => item.id === itemToToggle.id);\n\n      setItems(\n        items\n          .slice(0, index)\n          .concat({\n            ...itemToToggle,\n            isComplete: !itemToToggle.isComplete,\n          })\n          .concat(items.slice(index + 1)),\n      );\n    },\n    [items],\n  );\n\n  return (\n    <Fragment>\n      <h1>List</h1>\n      <input\n        type=\"text\"\n        placeholder=\"New list item...\"\n        value={newItemText}\n        onChange={handleChange}\n        onKeyPress={handleKeyPress}\n      />\n      <button disabled={newItemText === ''} onClick={handleClick}>\n        <span role=\"img\" aria-label=\"Add item\">\n          Add\n        </span>\n      </button>\n      <ul>\n        {items.map(item => (\n          <ListItem\n            key={item.id}\n            item={item}\n            removeItem={removeItem}\n            toggleItem={toggleItem}\n          />\n        ))}\n      </ul>\n    </Fragment>\n  );\n}\n"],"x_facebook_sources":[[null,[{"names":["<no-hook>","handleDelete","handleToggle","newItemText","items","uid","handleClick","handleKeyPress","handleChange","removeItem","toggleItem"],"mappings":"CAAD;cuBCA;gBCDA;kBDEA;oBCFA;sCgBGA,AYHA;uCxBIA;2CxBJA;4CoBKA,AWLA;8CbMA;2DSNA;6DNOA;oEtBPA;sEoBQA;2EpBRA;6EkBSA;gFlBTA;kFkBUA;mGlBVA"}]]]}}]}
\ No newline at end of file
diff --git a/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/fb-sources-extended/index-map/index.js b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/fb-sources-extended/index-map/index.js
new file mode 100644
index 0000000000000..a0f706b19fbaf
--- /dev/null
+++ b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/fb-sources-extended/index-map/index.js
@@ -0,0 +1,89 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+Object.defineProperty(exports, "ComponentUsingHooksIndirectly", {
+  enumerable: true,
+  get: function () {
+    return _ComponentUsingHooksIndirectly.Component;
+  }
+});
+Object.defineProperty(exports, "ComponentWithCustomHook", {
+  enumerable: true,
+  get: function () {
+    return _ComponentWithCustomHook.Component;
+  }
+});
+Object.defineProperty(exports, "ComponentWithExternalCustomHooks", {
+  enumerable: true,
+  get: function () {
+    return _ComponentWithExternalCustomHooks.Component;
+  }
+});
+Object.defineProperty(exports, "ComponentWithMultipleHooksPerLine", {
+  enumerable: true,
+  get: function () {
+    return _ComponentWithMultipleHooksPerLine.Component;
+  }
+});
+Object.defineProperty(exports, "ComponentWithNestedHooks", {
+  enumerable: true,
+  get: function () {
+    return _ComponentWithNestedHooks.Component;
+  }
+});
+Object.defineProperty(exports, "ContainingStringSourceMappingURL", {
+  enumerable: true,
+  get: function () {
+    return _ContainingStringSourceMappingURL.Component;
+  }
+});
+Object.defineProperty(exports, "Example", {
+  enumerable: true,
+  get: function () {
+    return _Example.Component;
+  }
+});
+Object.defineProperty(exports, "InlineRequire", {
+  enumerable: true,
+  get: function () {
+    return _InlineRequire.Component;
+  }
+});
+Object.defineProperty(exports, "useTheme", {
+  enumerable: true,
+  get: function () {
+    return _useTheme.default;
+  }
+});
+exports.ToDoList = void 0;
+
+var _ComponentUsingHooksIndirectly = require("./ComponentUsingHooksIndirectly");
+
+var _ComponentWithCustomHook = require("./ComponentWithCustomHook");
+
+var _ComponentWithExternalCustomHooks = require("./ComponentWithExternalCustomHooks");
+
+var _ComponentWithMultipleHooksPerLine = require("./ComponentWithMultipleHooksPerLine");
+
+var _ComponentWithNestedHooks = require("./ComponentWithNestedHooks");
+
+var _ContainingStringSourceMappingURL = require("./ContainingStringSourceMappingURL");
+
+var _Example = require("./Example");
+
+var _InlineRequire = require("./InlineRequire");
+
+var ToDoList = _interopRequireWildcard(require("./ToDoList"));
+
+exports.ToDoList = ToDoList;
+
+var _useTheme = _interopRequireDefault(require("./useTheme"));
+
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
+
+function _getRequireWildcardCache() { if (typeof WeakMap !== "function") return null; var cache = new WeakMap(); _getRequireWildcardCache = function () { return cache; }; return cache; }
+
+function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } if (obj === null || typeof obj !== "object" && typeof obj !== "function") { return { default: obj }; } var cache = _getRequireWildcardCache(); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) { var desc = hasPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : null; if (desc && (desc.get || desc.set)) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } newObj.default = obj; if (cache) { cache.set(obj, newObj); } return newObj; }
+//# sourceMappingURL=index.js.map
\ No newline at end of file
diff --git a/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/fb-sources-extended/index-map/index.js.map b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/fb-sources-extended/index-map/index.js.map
new file mode 100644
index 0000000000000..774200ec8e40a
--- /dev/null
+++ b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/fb-sources-extended/index-map/index.js.map
@@ -0,0 +1 @@
+{"version":3,"sections":[{"offset":{"line":0,"column":0},"map":{"version":3,"sources":["index.js"],"names":[],"mappings":";;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;AASA;;AACA;;AACA;;AACA;;AACA;;AACA;;AACA;;AACA;;AACA;;;;AAEA","sourcesContent":["/**\n * Copyright (c) Facebook, Inc. and its affiliates.\n *\n * This source code is licensed under the MIT license found in the\n * LICENSE file in the root directory of this source tree.\n *\n * @flow\n */\n\nexport {Component as ComponentUsingHooksIndirectly} from './ComponentUsingHooksIndirectly';\nexport {Component as ComponentWithCustomHook} from './ComponentWithCustomHook';\nexport {Component as ComponentWithExternalCustomHooks} from './ComponentWithExternalCustomHooks';\nexport {Component as ComponentWithMultipleHooksPerLine} from './ComponentWithMultipleHooksPerLine';\nexport {Component as ComponentWithNestedHooks} from './ComponentWithNestedHooks';\nexport {Component as ContainingStringSourceMappingURL} from './ContainingStringSourceMappingURL';\nexport {Component as Example} from './Example';\nexport {Component as InlineRequire} from './InlineRequire';\nimport * as ToDoList from './ToDoList';\nexport {ToDoList};\nexport {default as useTheme} from './useTheme';\n"],"x_facebook_sources":[[null,[{"names":["<no-hook>"],"mappings":"CAAD"}]]]}}]}
\ No newline at end of file
diff --git a/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/fb-sources-extended/index-map/useTheme.js b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/fb-sources-extended/index-map/useTheme.js
new file mode 100644
index 0000000000000..95bb454253ec3
--- /dev/null
+++ b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/fb-sources-extended/index-map/useTheme.js
@@ -0,0 +1,27 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = useTheme;
+exports.ThemeContext = void 0;
+
+var _react = require("react");
+
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow
+ */
+const ThemeContext = /*#__PURE__*/(0, _react.createContext)('bright');
+exports.ThemeContext = ThemeContext;
+
+function useTheme() {
+  const theme = (0, _react.useContext)(ThemeContext);
+  (0, _react.useDebugValue)(theme);
+  return theme;
+}
+//# sourceMappingURL=useTheme.js.map
\ No newline at end of file
diff --git a/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/fb-sources-extended/index-map/useTheme.js.map b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/fb-sources-extended/index-map/useTheme.js.map
new file mode 100644
index 0000000000000..53e07b1b9c3c0
--- /dev/null
+++ b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/fb-sources-extended/index-map/useTheme.js.map
@@ -0,0 +1 @@
+{"version":3,"sections":[{"offset":{"line":0,"column":0},"map":{"version":3,"sources":["useTheme.js"],"names":["ThemeContext","useTheme","theme"],"mappings":";;;;;;;;AASA;;AATA;;;;;;;;AAWO,MAAMA,YAAY,gBAAG,0BAAc,QAAd,CAArB;;;AAEQ,SAASC,QAAT,GAAoB;AACjC,QAAMC,KAAK,GAAG,uBAAWF,YAAX,CAAd;AACA,4BAAcE,KAAd;AACA,SAAOA,KAAP;AACD","sourcesContent":["/**\n * Copyright (c) Facebook, Inc. and its affiliates.\n *\n * This source code is licensed under the MIT license found in the\n * LICENSE file in the root directory of this source tree.\n *\n * @flow\n */\n\nimport {createContext, useContext, useDebugValue} from 'react';\n\nexport const ThemeContext = createContext('bright');\n\nexport default function useTheme() {\n  const theme = useContext(ThemeContext);\n  useDebugValue(theme);\n  return theme;\n}\n"],"x_facebook_sources":[[null,[{"names":["<no-hook>","theme"],"mappings":"CAAD;egBCA,AwBDA"}]]]}}]}
\ No newline at end of file
diff --git a/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/index-map/ComponentUsingHooksIndirectly.js b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/index-map/ComponentUsingHooksIndirectly.js
new file mode 100644
index 0000000000000..6925712d17c7c
--- /dev/null
+++ b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/index-map/ComponentUsingHooksIndirectly.js
@@ -0,0 +1,45 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.Component = Component;
+
+var _react = _interopRequireWildcard(require("react"));
+
+function _getRequireWildcardCache() { if (typeof WeakMap !== "function") return null; var cache = new WeakMap(); _getRequireWildcardCache = function () { return cache; }; return cache; }
+
+function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } if (obj === null || typeof obj !== "object" && typeof obj !== "function") { return { default: obj }; } var cache = _getRequireWildcardCache(); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) { var desc = hasPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : null; if (desc && (desc.get || desc.set)) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } newObj.default = obj; if (cache) { cache.set(obj, newObj); } return newObj; }
+
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow
+ */
+function Component() {
+  const countState = (0, _react.useState)(0);
+  const count = countState[0];
+  const setCount = countState[1];
+  const darkMode = useIsDarkMode();
+  const [isDarkMode] = darkMode;
+  (0, _react.useEffect)(() => {// ...
+  }, []);
+
+  const handleClick = () => setCount(count + 1);
+
+  return /*#__PURE__*/_react.default.createElement(_react.default.Fragment, null, /*#__PURE__*/_react.default.createElement("div", null, "Dark mode? ", isDarkMode), /*#__PURE__*/_react.default.createElement("div", null, "Count: ", count), /*#__PURE__*/_react.default.createElement("button", {
+    onClick: handleClick
+  }, "Update count"));
+}
+
+function useIsDarkMode() {
+  const darkModeState = (0, _react.useState)(false);
+  const [isDarkMode] = darkModeState;
+  (0, _react.useEffect)(function useEffectCreate() {// Here is where we may listen to a "theme" event...
+  }, []);
+  return [isDarkMode, () => {}];
+}
+//# sourceMappingURL=ComponentUsingHooksIndirectly.js.map
\ No newline at end of file
diff --git a/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/index-map/ComponentUsingHooksIndirectly.js.map b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/index-map/ComponentUsingHooksIndirectly.js.map
new file mode 100644
index 0000000000000..4d9e81529d3d7
--- /dev/null
+++ b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/index-map/ComponentUsingHooksIndirectly.js.map
@@ -0,0 +1 @@
+{"version":3,"sections":[{"offset":{"line":0,"column":0},"map":{"version":3,"sources":["ComponentUsingHooksIndirectly.js"],"names":["Component","countState","count","setCount","darkMode","useIsDarkMode","isDarkMode","handleClick","darkModeState","useEffectCreate"],"mappings":";;;;;;;AASA;;;;;;AATA;;;;;;;;AAWO,SAASA,SAAT,GAAqB;AAC1B,QAAMC,UAAU,GAAG,qBAAS,CAAT,CAAnB;AACA,QAAMC,KAAK,GAAGD,UAAU,CAAC,CAAD,CAAxB;AACA,QAAME,QAAQ,GAAGF,UAAU,CAAC,CAAD,CAA3B;AAEA,QAAMG,QAAQ,GAAGC,aAAa,EAA9B;AACA,QAAM,CAACC,UAAD,IAAeF,QAArB;AAEA,wBAAU,MAAM,CACd;AACD,GAFD,EAEG,EAFH;;AAIA,QAAMG,WAAW,GAAG,MAAMJ,QAAQ,CAACD,KAAK,GAAG,CAAT,CAAlC;;AAEA,sBACE,yEACE,yDAAiBI,UAAjB,CADF,eAEE,qDAAaJ,KAAb,CAFF,eAGE;AAAQ,IAAA,OAAO,EAAEK;AAAjB,oBAHF,CADF;AAOD;;AAED,SAASF,aAAT,GAAyB;AACvB,QAAMG,aAAa,GAAG,qBAAS,KAAT,CAAtB;AACA,QAAM,CAACF,UAAD,IAAeE,aAArB;AAEA,wBAAU,SAASC,eAAT,GAA2B,CACnC;AACD,GAFD,EAEG,EAFH;AAIA,SAAO,CAACH,UAAD,EAAa,MAAM,CAAE,CAArB,CAAP;AACD","sourcesContent":["/**\n * Copyright (c) Facebook, Inc. and its affiliates.\n *\n * This source code is licensed under the MIT license found in the\n * LICENSE file in the root directory of this source tree.\n *\n * @flow\n */\n\nimport React, {useEffect, useState} from 'react';\n\nexport function Component() {\n  const countState = useState(0);\n  const count = countState[0];\n  const setCount = countState[1];\n\n  const darkMode = useIsDarkMode();\n  const [isDarkMode] = darkMode;\n\n  useEffect(() => {\n    // ...\n  }, []);\n\n  const handleClick = () => setCount(count + 1);\n\n  return (\n    <>\n      <div>Dark mode? {isDarkMode}</div>\n      <div>Count: {count}</div>\n      <button onClick={handleClick}>Update count</button>\n    </>\n  );\n}\n\nfunction useIsDarkMode() {\n  const darkModeState = useState(false);\n  const [isDarkMode] = darkModeState;\n\n  useEffect(function useEffectCreate() {\n    // Here is where we may listen to a \"theme\" event...\n  }, []);\n\n  return [isDarkMode, () => {}];\n}\n"]}}]}
\ No newline at end of file
diff --git a/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/index-map/ComponentWithCustomHook.js b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/index-map/ComponentWithCustomHook.js
new file mode 100644
index 0000000000000..e326d7a4962d5
--- /dev/null
+++ b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/index-map/ComponentWithCustomHook.js
@@ -0,0 +1,41 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.Component = Component;
+
+var _react = _interopRequireWildcard(require("react"));
+
+function _getRequireWildcardCache() { if (typeof WeakMap !== "function") return null; var cache = new WeakMap(); _getRequireWildcardCache = function () { return cache; }; return cache; }
+
+function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } if (obj === null || typeof obj !== "object" && typeof obj !== "function") { return { default: obj }; } var cache = _getRequireWildcardCache(); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) { var desc = hasPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : null; if (desc && (desc.get || desc.set)) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } newObj.default = obj; if (cache) { cache.set(obj, newObj); } return newObj; }
+
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow
+ */
+function Component() {
+  const [count, setCount] = (0, _react.useState)(0);
+  const isDarkMode = useIsDarkMode();
+  (0, _react.useEffect)(() => {// ...
+  }, []);
+
+  const handleClick = () => setCount(count + 1);
+
+  return /*#__PURE__*/_react.default.createElement(_react.default.Fragment, null, /*#__PURE__*/_react.default.createElement("div", null, "Dark mode? ", isDarkMode), /*#__PURE__*/_react.default.createElement("div", null, "Count: ", count), /*#__PURE__*/_react.default.createElement("button", {
+    onClick: handleClick
+  }, "Update count"));
+}
+
+function useIsDarkMode() {
+  const [isDarkMode] = (0, _react.useState)(false);
+  (0, _react.useEffect)(function useEffectCreate() {// Here is where we may listen to a "theme" event...
+  }, []);
+  return isDarkMode;
+}
+//# sourceMappingURL=ComponentWithCustomHook.js.map
\ No newline at end of file
diff --git a/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/index-map/ComponentWithCustomHook.js.map b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/index-map/ComponentWithCustomHook.js.map
new file mode 100644
index 0000000000000..420fcfb556063
--- /dev/null
+++ b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/index-map/ComponentWithCustomHook.js.map
@@ -0,0 +1 @@
+{"version":3,"sections":[{"offset":{"line":0,"column":0},"map":{"version":3,"sources":["ComponentWithCustomHook.js"],"names":["Component","count","setCount","isDarkMode","useIsDarkMode","handleClick","useEffectCreate"],"mappings":";;;;;;;AASA;;;;;;AATA;;;;;;;;AAWO,SAASA,SAAT,GAAqB;AAC1B,QAAM,CAACC,KAAD,EAAQC,QAAR,IAAoB,qBAAS,CAAT,CAA1B;AACA,QAAMC,UAAU,GAAGC,aAAa,EAAhC;AAEA,wBAAU,MAAM,CACd;AACD,GAFD,EAEG,EAFH;;AAIA,QAAMC,WAAW,GAAG,MAAMH,QAAQ,CAACD,KAAK,GAAG,CAAT,CAAlC;;AAEA,sBACE,yEACE,yDAAiBE,UAAjB,CADF,eAEE,qDAAaF,KAAb,CAFF,eAGE;AAAQ,IAAA,OAAO,EAAEI;AAAjB,oBAHF,CADF;AAOD;;AAED,SAASD,aAAT,GAAyB;AACvB,QAAM,CAACD,UAAD,IAAe,qBAAS,KAAT,CAArB;AAEA,wBAAU,SAASG,eAAT,GAA2B,CACnC;AACD,GAFD,EAEG,EAFH;AAIA,SAAOH,UAAP;AACD","sourcesContent":["/**\n * Copyright (c) Facebook, Inc. and its affiliates.\n *\n * This source code is licensed under the MIT license found in the\n * LICENSE file in the root directory of this source tree.\n *\n * @flow\n */\n\nimport React, {useEffect, useState} from 'react';\n\nexport function Component() {\n  const [count, setCount] = useState(0);\n  const isDarkMode = useIsDarkMode();\n\n  useEffect(() => {\n    // ...\n  }, []);\n\n  const handleClick = () => setCount(count + 1);\n\n  return (\n    <>\n      <div>Dark mode? {isDarkMode}</div>\n      <div>Count: {count}</div>\n      <button onClick={handleClick}>Update count</button>\n    </>\n  );\n}\n\nfunction useIsDarkMode() {\n  const [isDarkMode] = useState(false);\n\n  useEffect(function useEffectCreate() {\n    // Here is where we may listen to a \"theme\" event...\n  }, []);\n\n  return isDarkMode;\n}\n"]}}]}
\ No newline at end of file
diff --git a/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/index-map/ComponentWithExternalCustomHooks.js b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/index-map/ComponentWithExternalCustomHooks.js
new file mode 100644
index 0000000000000..05aedb938b715
--- /dev/null
+++ b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/index-map/ComponentWithExternalCustomHooks.js
@@ -0,0 +1,26 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.Component = Component;
+
+var _react = _interopRequireDefault(require("react"));
+
+var _useTheme = _interopRequireDefault(require("./useTheme"));
+
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
+
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow
+ */
+function Component() {
+  const theme = (0, _useTheme.default)();
+  return /*#__PURE__*/_react.default.createElement("div", null, "theme: ", theme);
+}
+//# sourceMappingURL=ComponentWithExternalCustomHooks.js.map
\ No newline at end of file
diff --git a/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/index-map/ComponentWithExternalCustomHooks.js.map b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/index-map/ComponentWithExternalCustomHooks.js.map
new file mode 100644
index 0000000000000..b4dbf9e15ec16
--- /dev/null
+++ b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/index-map/ComponentWithExternalCustomHooks.js.map
@@ -0,0 +1 @@
+{"version":3,"sections":[{"offset":{"line":0,"column":0},"map":{"version":3,"sources":["ComponentWithExternalCustomHooks.js"],"names":["Component","theme"],"mappings":";;;;;;;AASA;;AACA;;;;AAVA;;;;;;;;AAYO,SAASA,SAAT,GAAqB;AAC1B,QAAMC,KAAK,GAAG,wBAAd;AAEA,sBAAO,qDAAaA,KAAb,CAAP;AACD","sourcesContent":["/**\n * Copyright (c) Facebook, Inc. and its affiliates.\n *\n * This source code is licensed under the MIT license found in the\n * LICENSE file in the root directory of this source tree.\n *\n * @flow\n */\n\nimport React from 'react';\nimport useTheme from './useTheme';\n\nexport function Component() {\n  const theme = useTheme();\n\n  return <div>theme: {theme}</div>;\n}\n"]}}]}
\ No newline at end of file
diff --git a/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/index-map/ComponentWithMultipleHooksPerLine.js b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/index-map/ComponentWithMultipleHooksPerLine.js
new file mode 100644
index 0000000000000..c657f3eb54551
--- /dev/null
+++ b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/index-map/ComponentWithMultipleHooksPerLine.js
@@ -0,0 +1,30 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.Component = Component;
+
+var _react = require("react");
+
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow
+ */
+const A = /*#__PURE__*/(0, _react.createContext)(1);
+const B = /*#__PURE__*/(0, _react.createContext)(2);
+
+function Component() {
+  const a = (0, _react.useContext)(A);
+  const b = (0, _react.useContext)(B); // prettier-ignore
+
+  const c = (0, _react.useContext)(A),
+        d = (0, _react.useContext)(B); // eslint-disable-line one-var
+
+  return a + b + c + d;
+}
+//# sourceMappingURL=ComponentWithMultipleHooksPerLine.js.map
\ No newline at end of file
diff --git a/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/index-map/ComponentWithMultipleHooksPerLine.js.map b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/index-map/ComponentWithMultipleHooksPerLine.js.map
new file mode 100644
index 0000000000000..31ecd2d51adb3
--- /dev/null
+++ b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/index-map/ComponentWithMultipleHooksPerLine.js.map
@@ -0,0 +1 @@
+{"version":3,"sections":[{"offset":{"line":0,"column":0},"map":{"version":3,"sources":["ComponentWithMultipleHooksPerLine.js"],"names":["A","B","Component","a","b","c","d"],"mappings":";;;;;;;AASA;;AATA;;;;;;;;AAWA,MAAMA,CAAC,gBAAG,0BAAc,CAAd,CAAV;AACA,MAAMC,CAAC,gBAAG,0BAAc,CAAd,CAAV;;AAEO,SAASC,SAAT,GAAqB;AAC1B,QAAMC,CAAC,GAAG,uBAAWH,CAAX,CAAV;AACA,QAAMI,CAAC,GAAG,uBAAWH,CAAX,CAAV,CAF0B,CAI1B;;AACA,QAAMI,CAAC,GAAG,uBAAWL,CAAX,CAAV;AAAA,QAAyBM,CAAC,GAAG,uBAAWL,CAAX,CAA7B,CAL0B,CAKkB;;AAE5C,SAAOE,CAAC,GAAGC,CAAJ,GAAQC,CAAR,GAAYC,CAAnB;AACD","sourcesContent":["/**\n * Copyright (c) Facebook, Inc. and its affiliates.\n *\n * This source code is licensed under the MIT license found in the\n * LICENSE file in the root directory of this source tree.\n *\n * @flow\n */\n\nimport {createContext, useContext} from 'react';\n\nconst A = createContext(1);\nconst B = createContext(2);\n\nexport function Component() {\n  const a = useContext(A);\n  const b = useContext(B);\n\n  // prettier-ignore\n  const c = useContext(A), d = useContext(B); // eslint-disable-line one-var\n\n  return a + b + c + d;\n}\n"]}}]}
\ No newline at end of file
diff --git a/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/index-map/ComponentWithNestedHooks.js b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/index-map/ComponentWithNestedHooks.js
new file mode 100644
index 0000000000000..3cfed69078a8c
--- /dev/null
+++ b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/index-map/ComponentWithNestedHooks.js
@@ -0,0 +1,28 @@
+"use strict";
+
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow
+ */
+const {
+  useMemo,
+  useState
+} = require('react');
+
+function Component(props) {
+  const InnerComponent = useMemo(() => () => {
+    const [state] = useState(0);
+    return state;
+  });
+  props.callback(InnerComponent);
+  return null;
+}
+
+module.exports = {
+  Component
+};
+//# sourceMappingURL=ComponentWithNestedHooks.js.map
\ No newline at end of file
diff --git a/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/index-map/ComponentWithNestedHooks.js.map b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/index-map/ComponentWithNestedHooks.js.map
new file mode 100644
index 0000000000000..d73452228759f
--- /dev/null
+++ b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/index-map/ComponentWithNestedHooks.js.map
@@ -0,0 +1 @@
+{"version":3,"sections":[{"offset":{"line":0,"column":0},"map":{"version":3,"sources":["ComponentWithNestedHooks.js"],"names":["useMemo","useState","require","Component","props","InnerComponent","state","callback","module","exports"],"mappings":";;AAAA;;;;;;;;AAQA,MAAM;AAACA,EAAAA,OAAD;AAAUC,EAAAA;AAAV,IAAsBC,OAAO,CAAC,OAAD,CAAnC;;AAEA,SAASC,SAAT,CAAmBC,KAAnB,EAA0B;AACxB,QAAMC,cAAc,GAAGL,OAAO,CAAC,MAAM,MAAM;AACzC,UAAM,CAACM,KAAD,IAAUL,QAAQ,CAAC,CAAD,CAAxB;AAEA,WAAOK,KAAP;AACD,GAJ6B,CAA9B;AAKAF,EAAAA,KAAK,CAACG,QAAN,CAAeF,cAAf;AAEA,SAAO,IAAP;AACD;;AAEDG,MAAM,CAACC,OAAP,GAAiB;AAACN,EAAAA;AAAD,CAAjB","sourcesContent":["/**\n * Copyright (c) Facebook, Inc. and its affiliates.\n *\n * This source code is licensed under the MIT license found in the\n * LICENSE file in the root directory of this source tree.\n *\n * @flow\n */\nconst {useMemo, useState} = require('react');\n\nfunction Component(props) {\n  const InnerComponent = useMemo(() => () => {\n    const [state] = useState(0);\n\n    return state;\n  });\n  props.callback(InnerComponent);\n\n  return null;\n}\n\nmodule.exports = {Component};\n"]}}]}
\ No newline at end of file
diff --git a/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/index-map/ContainingStringSourceMappingURL.js b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/index-map/ContainingStringSourceMappingURL.js
new file mode 100644
index 0000000000000..0fc2c078ca125
--- /dev/null
+++ b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/index-map/ContainingStringSourceMappingURL.js
@@ -0,0 +1,29 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.Component = Component;
+
+var _react = _interopRequireWildcard(require("react"));
+
+function _getRequireWildcardCache() { if (typeof WeakMap !== "function") return null; var cache = new WeakMap(); _getRequireWildcardCache = function () { return cache; }; return cache; }
+
+function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } if (obj === null || typeof obj !== "object" && typeof obj !== "function") { return { default: obj }; } var cache = _getRequireWildcardCache(); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) { var desc = hasPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : null; if (desc && (desc.get || desc.set)) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } newObj.default = obj; if (cache) { cache.set(obj, newObj); } return newObj; }
+
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow
+ */
+// ?sourceMappingURL=([^\s'"]+)/gm
+function Component() {
+  const [count, setCount] = (0, _react.useState)(0);
+  return /*#__PURE__*/_react.default.createElement("div", null, /*#__PURE__*/_react.default.createElement("p", null, "You clicked ", count, " times"), /*#__PURE__*/_react.default.createElement("button", {
+    onClick: () => setCount(count + 1)
+  }, "Click me"));
+}
+//# sourceMappingURL=ContainingStringSourceMappingURL.js.map
\ No newline at end of file
diff --git a/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/index-map/ContainingStringSourceMappingURL.js.map b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/index-map/ContainingStringSourceMappingURL.js.map
new file mode 100644
index 0000000000000..7b95325ab1794
--- /dev/null
+++ b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/index-map/ContainingStringSourceMappingURL.js.map
@@ -0,0 +1 @@
+{"version":3,"sections":[{"offset":{"line":0,"column":0},"map":{"version":3,"sources":["ContainingStringSourceMappingURL.js"],"names":["Component","count","setCount"],"mappings":";;;;;;;AASA;;;;;;AATA;;;;;;;;AAWA;AAEO,SAASA,SAAT,GAAqB;AAC1B,QAAM,CAACC,KAAD,EAAQC,QAAR,IAAoB,qBAAS,CAAT,CAA1B;AAEA,sBACE,uDACE,wDAAgBD,KAAhB,WADF,eAEE;AAAQ,IAAA,OAAO,EAAE,MAAMC,QAAQ,CAACD,KAAK,GAAG,CAAT;AAA/B,gBAFF,CADF;AAMD","sourcesContent":["/**\n * Copyright (c) Facebook, Inc. and its affiliates.\n *\n * This source code is licensed under the MIT license found in the\n * LICENSE file in the root directory of this source tree.\n *\n * @flow\n */\n\nimport React, {useState} from 'react';\n\n// ?sourceMappingURL=([^\\s'\"]+)/gm\n\nexport function Component() {\n  const [count, setCount] = useState(0);\n\n  return (\n    <div>\n      <p>You clicked {count} times</p>\n      <button onClick={() => setCount(count + 1)}>Click me</button>\n    </div>\n  );\n}\n"]}}]}
\ No newline at end of file
diff --git a/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/index-map/Example.js b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/index-map/Example.js
new file mode 100644
index 0000000000000..19134738824bc
--- /dev/null
+++ b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/index-map/Example.js
@@ -0,0 +1,28 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.Component = Component;
+
+var _react = _interopRequireWildcard(require("react"));
+
+function _getRequireWildcardCache() { if (typeof WeakMap !== "function") return null; var cache = new WeakMap(); _getRequireWildcardCache = function () { return cache; }; return cache; }
+
+function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } if (obj === null || typeof obj !== "object" && typeof obj !== "function") { return { default: obj }; } var cache = _getRequireWildcardCache(); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) { var desc = hasPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : null; if (desc && (desc.get || desc.set)) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } newObj.default = obj; if (cache) { cache.set(obj, newObj); } return newObj; }
+
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow
+ */
+function Component() {
+  const [count, setCount] = (0, _react.useState)(0);
+  return /*#__PURE__*/_react.default.createElement("div", null, /*#__PURE__*/_react.default.createElement("p", null, "You clicked ", count, " times"), /*#__PURE__*/_react.default.createElement("button", {
+    onClick: () => setCount(count + 1)
+  }, "Click me"));
+}
+//# sourceMappingURL=Example.js.map
\ No newline at end of file
diff --git a/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/index-map/Example.js.map b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/index-map/Example.js.map
new file mode 100644
index 0000000000000..16875ee93d815
--- /dev/null
+++ b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/index-map/Example.js.map
@@ -0,0 +1 @@
+{"version":3,"sections":[{"offset":{"line":0,"column":0},"map":{"version":3,"sources":["Example.js"],"names":["Component","count","setCount"],"mappings":";;;;;;;AASA;;;;;;AATA;;;;;;;;AAWO,SAASA,SAAT,GAAqB;AAC1B,QAAM,CAACC,KAAD,EAAQC,QAAR,IAAoB,qBAAS,CAAT,CAA1B;AAEA,sBACE,uDACE,wDAAgBD,KAAhB,WADF,eAEE;AAAQ,IAAA,OAAO,EAAE,MAAMC,QAAQ,CAACD,KAAK,GAAG,CAAT;AAA/B,gBAFF,CADF;AAMD","sourcesContent":["/**\n * Copyright (c) Facebook, Inc. and its affiliates.\n *\n * This source code is licensed under the MIT license found in the\n * LICENSE file in the root directory of this source tree.\n *\n * @flow\n */\n\nimport React, {useState} from 'react';\n\nexport function Component() {\n  const [count, setCount] = useState(0);\n\n  return (\n    <div>\n      <p>You clicked {count} times</p>\n      <button onClick={() => setCount(count + 1)}>Click me</button>\n    </div>\n  );\n}\n"]}}]}
\ No newline at end of file
diff --git a/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/index-map/InlineRequire.js b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/index-map/InlineRequire.js
new file mode 100644
index 0000000000000..388aeda62b308
--- /dev/null
+++ b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/index-map/InlineRequire.js
@@ -0,0 +1,21 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.Component = Component;
+
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow
+ */
+function Component() {
+  const [count] = require('react').useState(0);
+
+  return count;
+}
+//# sourceMappingURL=InlineRequire.js.map
\ No newline at end of file
diff --git a/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/index-map/InlineRequire.js.map b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/index-map/InlineRequire.js.map
new file mode 100644
index 0000000000000..fb426f5709cf8
--- /dev/null
+++ b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/index-map/InlineRequire.js.map
@@ -0,0 +1 @@
+{"version":3,"sections":[{"offset":{"line":0,"column":0},"map":{"version":3,"sources":["InlineRequire.js"],"names":["Component","count","require","useState"],"mappings":";;;;;;;AAAA;;;;;;;;AASO,SAASA,SAAT,GAAqB;AAC1B,QAAM,CAACC,KAAD,IAAUC,OAAO,CAAC,OAAD,CAAP,CAAiBC,QAAjB,CAA0B,CAA1B,CAAhB;;AAEA,SAAOF,KAAP;AACD","sourcesContent":["/**\n * Copyright (c) Facebook, Inc. and its affiliates.\n *\n * This source code is licensed under the MIT license found in the\n * LICENSE file in the root directory of this source tree.\n *\n * @flow\n */\n\nexport function Component() {\n  const [count] = require('react').useState(0);\n\n  return count;\n}\n"]}}]}
\ No newline at end of file
diff --git a/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/index-map/ToDoList.js b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/index-map/ToDoList.js
new file mode 100644
index 0000000000000..a6eb863b661ff
--- /dev/null
+++ b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/index-map/ToDoList.js
@@ -0,0 +1,106 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.ListItem = ListItem;
+exports.List = List;
+
+var React = _interopRequireWildcard(require("react"));
+
+function _getRequireWildcardCache() { if (typeof WeakMap !== "function") return null; var cache = new WeakMap(); _getRequireWildcardCache = function () { return cache; }; return cache; }
+
+function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } if (obj === null || typeof obj !== "object" && typeof obj !== "function") { return { default: obj }; } var cache = _getRequireWildcardCache(); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) { var desc = hasPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : null; if (desc && (desc.get || desc.set)) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } newObj.default = obj; if (cache) { cache.set(obj, newObj); } return newObj; }
+
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow
+ */
+function ListItem({
+  item,
+  removeItem,
+  toggleItem
+}) {
+  const handleDelete = (0, React.useCallback)(() => {
+    removeItem(item);
+  }, [item, removeItem]);
+  const handleToggle = (0, React.useCallback)(() => {
+    toggleItem(item);
+  }, [item, toggleItem]);
+  return /*#__PURE__*/React.createElement("li", null, /*#__PURE__*/React.createElement("button", {
+    onClick: handleDelete
+  }, "Delete"), /*#__PURE__*/React.createElement("label", null, /*#__PURE__*/React.createElement("input", {
+    checked: item.isComplete,
+    onChange: handleToggle,
+    type: "checkbox"
+  }), ' ', item.text));
+}
+
+function List(props) {
+  const [newItemText, setNewItemText] = (0, React.useState)('');
+  const [items, setItems] = (0, React.useState)([{
+    id: 1,
+    isComplete: true,
+    text: 'First'
+  }, {
+    id: 2,
+    isComplete: true,
+    text: 'Second'
+  }, {
+    id: 3,
+    isComplete: false,
+    text: 'Third'
+  }]);
+  const [uid, setUID] = (0, React.useState)(4);
+  const handleClick = (0, React.useCallback)(() => {
+    if (newItemText !== '') {
+      setItems([...items, {
+        id: uid,
+        isComplete: false,
+        text: newItemText
+      }]);
+      setUID(uid + 1);
+      setNewItemText('');
+    }
+  }, [newItemText, items, uid]);
+  const handleKeyPress = (0, React.useCallback)(event => {
+    if (event.key === 'Enter') {
+      handleClick();
+    }
+  }, [handleClick]);
+  const handleChange = (0, React.useCallback)(event => {
+    setNewItemText(event.currentTarget.value);
+  }, [setNewItemText]);
+  const removeItem = (0, React.useCallback)(itemToRemove => setItems(items.filter(item => item !== itemToRemove)), [items]);
+  const toggleItem = (0, React.useCallback)(itemToToggle => {
+    // Dont use indexOf()
+    // because editing props in DevTools creates a new Object.
+    const index = items.findIndex(item => item.id === itemToToggle.id);
+    setItems(items.slice(0, index).concat({ ...itemToToggle,
+      isComplete: !itemToToggle.isComplete
+    }).concat(items.slice(index + 1)));
+  }, [items]);
+  return /*#__PURE__*/React.createElement(React.Fragment, null, /*#__PURE__*/React.createElement("h1", null, "List"), /*#__PURE__*/React.createElement("input", {
+    type: "text",
+    placeholder: "New list item...",
+    value: newItemText,
+    onChange: handleChange,
+    onKeyPress: handleKeyPress
+  }), /*#__PURE__*/React.createElement("button", {
+    disabled: newItemText === '',
+    onClick: handleClick
+  }, /*#__PURE__*/React.createElement("span", {
+    role: "img",
+    "aria-label": "Add item"
+  }, "Add")), /*#__PURE__*/React.createElement("ul", null, items.map(item => /*#__PURE__*/React.createElement(ListItem, {
+    key: item.id,
+    item: item,
+    removeItem: removeItem,
+    toggleItem: toggleItem
+  }))));
+}
+//# sourceMappingURL=ToDoList.js.map
\ No newline at end of file
diff --git a/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/index-map/ToDoList.js.map b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/index-map/ToDoList.js.map
new file mode 100644
index 0000000000000..af4b94acaccb1
--- /dev/null
+++ b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/index-map/ToDoList.js.map
@@ -0,0 +1 @@
+{"version":3,"sections":[{"offset":{"line":0,"column":0},"map":{"version":3,"sources":["ToDoList.js"],"names":["ListItem","item","removeItem","toggleItem","handleDelete","handleToggle","isComplete","text","List","props","newItemText","setNewItemText","items","setItems","id","uid","setUID","handleClick","handleKeyPress","event","key","handleChange","currentTarget","value","itemToRemove","filter","itemToToggle","index","findIndex","slice","concat","map"],"mappings":";;;;;;;;AASA;;;;;;AATA;;;;;;;;AAYO,SAASA,QAAT,CAAkB;AAACC,EAAAA,IAAD;AAAOC,EAAAA,UAAP;AAAmBC,EAAAA;AAAnB,CAAlB,EAAkD;AACvD,QAAMC,YAAY,GAAG,uBAAY,MAAM;AACrCF,IAAAA,UAAU,CAACD,IAAD,CAAV;AACD,GAFoB,EAElB,CAACA,IAAD,EAAOC,UAAP,CAFkB,CAArB;AAIA,QAAMG,YAAY,GAAG,uBAAY,MAAM;AACrCF,IAAAA,UAAU,CAACF,IAAD,CAAV;AACD,GAFoB,EAElB,CAACA,IAAD,EAAOE,UAAP,CAFkB,CAArB;AAIA,sBACE,6CACE;AAAQ,IAAA,OAAO,EAAEC;AAAjB,cADF,eAEE,gDACE;AACE,IAAA,OAAO,EAAEH,IAAI,CAACK,UADhB;AAEE,IAAA,QAAQ,EAAED,YAFZ;AAGE,IAAA,IAAI,EAAC;AAHP,IADF,EAKK,GALL,EAMGJ,IAAI,CAACM,IANR,CAFF,CADF;AAaD;;AAEM,SAASC,IAAT,CAAcC,KAAd,EAAqB;AAC1B,QAAM,CAACC,WAAD,EAAcC,cAAd,IAAgC,oBAAS,EAAT,CAAtC;AACA,QAAM,CAACC,KAAD,EAAQC,QAAR,IAAoB,oBAAS,CACjC;AAACC,IAAAA,EAAE,EAAE,CAAL;AAAQR,IAAAA,UAAU,EAAE,IAApB;AAA0BC,IAAAA,IAAI,EAAE;AAAhC,GADiC,EAEjC;AAACO,IAAAA,EAAE,EAAE,CAAL;AAAQR,IAAAA,UAAU,EAAE,IAApB;AAA0BC,IAAAA,IAAI,EAAE;AAAhC,GAFiC,EAGjC;AAACO,IAAAA,EAAE,EAAE,CAAL;AAAQR,IAAAA,UAAU,EAAE,KAApB;AAA2BC,IAAAA,IAAI,EAAE;AAAjC,GAHiC,CAAT,CAA1B;AAKA,QAAM,CAACQ,GAAD,EAAMC,MAAN,IAAgB,oBAAS,CAAT,CAAtB;AAEA,QAAMC,WAAW,GAAG,uBAAY,MAAM;AACpC,QAAIP,WAAW,KAAK,EAApB,EAAwB;AACtBG,MAAAA,QAAQ,CAAC,CACP,GAAGD,KADI,EAEP;AACEE,QAAAA,EAAE,EAAEC,GADN;AAEET,QAAAA,UAAU,EAAE,KAFd;AAGEC,QAAAA,IAAI,EAAEG;AAHR,OAFO,CAAD,CAAR;AAQAM,MAAAA,MAAM,CAACD,GAAG,GAAG,CAAP,CAAN;AACAJ,MAAAA,cAAc,CAAC,EAAD,CAAd;AACD;AACF,GAbmB,EAajB,CAACD,WAAD,EAAcE,KAAd,EAAqBG,GAArB,CAbiB,CAApB;AAeA,QAAMG,cAAc,GAAG,uBACrBC,KAAK,IAAI;AACP,QAAIA,KAAK,CAACC,GAAN,KAAc,OAAlB,EAA2B;AACzBH,MAAAA,WAAW;AACZ;AACF,GALoB,EAMrB,CAACA,WAAD,CANqB,CAAvB;AASA,QAAMI,YAAY,GAAG,uBACnBF,KAAK,IAAI;AACPR,IAAAA,cAAc,CAACQ,KAAK,CAACG,aAAN,CAAoBC,KAArB,CAAd;AACD,GAHkB,EAInB,CAACZ,cAAD,CAJmB,CAArB;AAOA,QAAMT,UAAU,GAAG,uBACjBsB,YAAY,IAAIX,QAAQ,CAACD,KAAK,CAACa,MAAN,CAAaxB,IAAI,IAAIA,IAAI,KAAKuB,YAA9B,CAAD,CADP,EAEjB,CAACZ,KAAD,CAFiB,CAAnB;AAKA,QAAMT,UAAU,GAAG,uBACjBuB,YAAY,IAAI;AACd;AACA;AACA,UAAMC,KAAK,GAAGf,KAAK,CAACgB,SAAN,CAAgB3B,IAAI,IAAIA,IAAI,CAACa,EAAL,KAAYY,YAAY,CAACZ,EAAjD,CAAd;AAEAD,IAAAA,QAAQ,CACND,KAAK,CACFiB,KADH,CACS,CADT,EACYF,KADZ,EAEGG,MAFH,CAEU,EACN,GAAGJ,YADG;AAENpB,MAAAA,UAAU,EAAE,CAACoB,YAAY,CAACpB;AAFpB,KAFV,EAMGwB,MANH,CAMUlB,KAAK,CAACiB,KAAN,CAAYF,KAAK,GAAG,CAApB,CANV,CADM,CAAR;AASD,GAfgB,EAgBjB,CAACf,KAAD,CAhBiB,CAAnB;AAmBA,sBACE,oBAAC,cAAD,qBACE,uCADF,eAEE;AACE,IAAA,IAAI,EAAC,MADP;AAEE,IAAA,WAAW,EAAC,kBAFd;AAGE,IAAA,KAAK,EAAEF,WAHT;AAIE,IAAA,QAAQ,EAAEW,YAJZ;AAKE,IAAA,UAAU,EAAEH;AALd,IAFF,eASE;AAAQ,IAAA,QAAQ,EAAER,WAAW,KAAK,EAAlC;AAAsC,IAAA,OAAO,EAAEO;AAA/C,kBACE;AAAM,IAAA,IAAI,EAAC,KAAX;AAAiB,kBAAW;AAA5B,WADF,CATF,eAcE,gCACGL,KAAK,CAACmB,GAAN,CAAU9B,IAAI,iBACb,oBAAC,QAAD;AACE,IAAA,GAAG,EAAEA,IAAI,CAACa,EADZ;AAEE,IAAA,IAAI,EAAEb,IAFR;AAGE,IAAA,UAAU,EAAEC,UAHd;AAIE,IAAA,UAAU,EAAEC;AAJd,IADD,CADH,CAdF,CADF;AA2BD","sourcesContent":["/**\n * Copyright (c) Facebook, Inc. and its affiliates.\n *\n * This source code is licensed under the MIT license found in the\n * LICENSE file in the root directory of this source tree.\n *\n * @flow\n */\n\nimport * as React from 'react';\nimport {Fragment, useCallback, useState} from 'react';\n\nexport function ListItem({item, removeItem, toggleItem}) {\n  const handleDelete = useCallback(() => {\n    removeItem(item);\n  }, [item, removeItem]);\n\n  const handleToggle = useCallback(() => {\n    toggleItem(item);\n  }, [item, toggleItem]);\n\n  return (\n    <li>\n      <button onClick={handleDelete}>Delete</button>\n      <label>\n        <input\n          checked={item.isComplete}\n          onChange={handleToggle}\n          type=\"checkbox\"\n        />{' '}\n        {item.text}\n      </label>\n    </li>\n  );\n}\n\nexport function List(props) {\n  const [newItemText, setNewItemText] = useState('');\n  const [items, setItems] = useState([\n    {id: 1, isComplete: true, text: 'First'},\n    {id: 2, isComplete: true, text: 'Second'},\n    {id: 3, isComplete: false, text: 'Third'},\n  ]);\n  const [uid, setUID] = useState(4);\n\n  const handleClick = useCallback(() => {\n    if (newItemText !== '') {\n      setItems([\n        ...items,\n        {\n          id: uid,\n          isComplete: false,\n          text: newItemText,\n        },\n      ]);\n      setUID(uid + 1);\n      setNewItemText('');\n    }\n  }, [newItemText, items, uid]);\n\n  const handleKeyPress = useCallback(\n    event => {\n      if (event.key === 'Enter') {\n        handleClick();\n      }\n    },\n    [handleClick],\n  );\n\n  const handleChange = useCallback(\n    event => {\n      setNewItemText(event.currentTarget.value);\n    },\n    [setNewItemText],\n  );\n\n  const removeItem = useCallback(\n    itemToRemove => setItems(items.filter(item => item !== itemToRemove)),\n    [items],\n  );\n\n  const toggleItem = useCallback(\n    itemToToggle => {\n      // Dont use indexOf()\n      // because editing props in DevTools creates a new Object.\n      const index = items.findIndex(item => item.id === itemToToggle.id);\n\n      setItems(\n        items\n          .slice(0, index)\n          .concat({\n            ...itemToToggle,\n            isComplete: !itemToToggle.isComplete,\n          })\n          .concat(items.slice(index + 1)),\n      );\n    },\n    [items],\n  );\n\n  return (\n    <Fragment>\n      <h1>List</h1>\n      <input\n        type=\"text\"\n        placeholder=\"New list item...\"\n        value={newItemText}\n        onChange={handleChange}\n        onKeyPress={handleKeyPress}\n      />\n      <button disabled={newItemText === ''} onClick={handleClick}>\n        <span role=\"img\" aria-label=\"Add item\">\n          Add\n        </span>\n      </button>\n      <ul>\n        {items.map(item => (\n          <ListItem\n            key={item.id}\n            item={item}\n            removeItem={removeItem}\n            toggleItem={toggleItem}\n          />\n        ))}\n      </ul>\n    </Fragment>\n  );\n}\n"]}}]}
\ No newline at end of file
diff --git a/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/index-map/index.js b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/index-map/index.js
new file mode 100644
index 0000000000000..a0f706b19fbaf
--- /dev/null
+++ b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/index-map/index.js
@@ -0,0 +1,89 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+Object.defineProperty(exports, "ComponentUsingHooksIndirectly", {
+  enumerable: true,
+  get: function () {
+    return _ComponentUsingHooksIndirectly.Component;
+  }
+});
+Object.defineProperty(exports, "ComponentWithCustomHook", {
+  enumerable: true,
+  get: function () {
+    return _ComponentWithCustomHook.Component;
+  }
+});
+Object.defineProperty(exports, "ComponentWithExternalCustomHooks", {
+  enumerable: true,
+  get: function () {
+    return _ComponentWithExternalCustomHooks.Component;
+  }
+});
+Object.defineProperty(exports, "ComponentWithMultipleHooksPerLine", {
+  enumerable: true,
+  get: function () {
+    return _ComponentWithMultipleHooksPerLine.Component;
+  }
+});
+Object.defineProperty(exports, "ComponentWithNestedHooks", {
+  enumerable: true,
+  get: function () {
+    return _ComponentWithNestedHooks.Component;
+  }
+});
+Object.defineProperty(exports, "ContainingStringSourceMappingURL", {
+  enumerable: true,
+  get: function () {
+    return _ContainingStringSourceMappingURL.Component;
+  }
+});
+Object.defineProperty(exports, "Example", {
+  enumerable: true,
+  get: function () {
+    return _Example.Component;
+  }
+});
+Object.defineProperty(exports, "InlineRequire", {
+  enumerable: true,
+  get: function () {
+    return _InlineRequire.Component;
+  }
+});
+Object.defineProperty(exports, "useTheme", {
+  enumerable: true,
+  get: function () {
+    return _useTheme.default;
+  }
+});
+exports.ToDoList = void 0;
+
+var _ComponentUsingHooksIndirectly = require("./ComponentUsingHooksIndirectly");
+
+var _ComponentWithCustomHook = require("./ComponentWithCustomHook");
+
+var _ComponentWithExternalCustomHooks = require("./ComponentWithExternalCustomHooks");
+
+var _ComponentWithMultipleHooksPerLine = require("./ComponentWithMultipleHooksPerLine");
+
+var _ComponentWithNestedHooks = require("./ComponentWithNestedHooks");
+
+var _ContainingStringSourceMappingURL = require("./ContainingStringSourceMappingURL");
+
+var _Example = require("./Example");
+
+var _InlineRequire = require("./InlineRequire");
+
+var ToDoList = _interopRequireWildcard(require("./ToDoList"));
+
+exports.ToDoList = ToDoList;
+
+var _useTheme = _interopRequireDefault(require("./useTheme"));
+
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
+
+function _getRequireWildcardCache() { if (typeof WeakMap !== "function") return null; var cache = new WeakMap(); _getRequireWildcardCache = function () { return cache; }; return cache; }
+
+function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } if (obj === null || typeof obj !== "object" && typeof obj !== "function") { return { default: obj }; } var cache = _getRequireWildcardCache(); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) { var desc = hasPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : null; if (desc && (desc.get || desc.set)) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } newObj.default = obj; if (cache) { cache.set(obj, newObj); } return newObj; }
+//# sourceMappingURL=index.js.map
\ No newline at end of file
diff --git a/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/index-map/index.js.map b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/index-map/index.js.map
new file mode 100644
index 0000000000000..d59810b5e2d78
--- /dev/null
+++ b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/index-map/index.js.map
@@ -0,0 +1 @@
+{"version":3,"sections":[{"offset":{"line":0,"column":0},"map":{"version":3,"sources":["index.js"],"names":[],"mappings":";;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;AASA;;AACA;;AACA;;AACA;;AACA;;AACA;;AACA;;AACA;;AACA;;;;AAEA","sourcesContent":["/**\n * Copyright (c) Facebook, Inc. and its affiliates.\n *\n * This source code is licensed under the MIT license found in the\n * LICENSE file in the root directory of this source tree.\n *\n * @flow\n */\n\nexport {Component as ComponentUsingHooksIndirectly} from './ComponentUsingHooksIndirectly';\nexport {Component as ComponentWithCustomHook} from './ComponentWithCustomHook';\nexport {Component as ComponentWithExternalCustomHooks} from './ComponentWithExternalCustomHooks';\nexport {Component as ComponentWithMultipleHooksPerLine} from './ComponentWithMultipleHooksPerLine';\nexport {Component as ComponentWithNestedHooks} from './ComponentWithNestedHooks';\nexport {Component as ContainingStringSourceMappingURL} from './ContainingStringSourceMappingURL';\nexport {Component as Example} from './Example';\nexport {Component as InlineRequire} from './InlineRequire';\nimport * as ToDoList from './ToDoList';\nexport {ToDoList};\nexport {default as useTheme} from './useTheme';\n"]}}]}
\ No newline at end of file
diff --git a/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/index-map/useTheme.js b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/index-map/useTheme.js
new file mode 100644
index 0000000000000..95bb454253ec3
--- /dev/null
+++ b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/index-map/useTheme.js
@@ -0,0 +1,27 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = useTheme;
+exports.ThemeContext = void 0;
+
+var _react = require("react");
+
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow
+ */
+const ThemeContext = /*#__PURE__*/(0, _react.createContext)('bright');
+exports.ThemeContext = ThemeContext;
+
+function useTheme() {
+  const theme = (0, _react.useContext)(ThemeContext);
+  (0, _react.useDebugValue)(theme);
+  return theme;
+}
+//# sourceMappingURL=useTheme.js.map
\ No newline at end of file
diff --git a/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/index-map/useTheme.js.map b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/index-map/useTheme.js.map
new file mode 100644
index 0000000000000..414389d32d041
--- /dev/null
+++ b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/index-map/useTheme.js.map
@@ -0,0 +1 @@
+{"version":3,"sections":[{"offset":{"line":0,"column":0},"map":{"version":3,"sources":["useTheme.js"],"names":["ThemeContext","useTheme","theme"],"mappings":";;;;;;;;AASA;;AATA;;;;;;;;AAWO,MAAMA,YAAY,gBAAG,0BAAc,QAAd,CAArB;;;AAEQ,SAASC,QAAT,GAAoB;AACjC,QAAMC,KAAK,GAAG,uBAAWF,YAAX,CAAd;AACA,4BAAcE,KAAd;AACA,SAAOA,KAAP;AACD","sourcesContent":["/**\n * Copyright (c) Facebook, Inc. and its affiliates.\n *\n * This source code is licensed under the MIT license found in the\n * LICENSE file in the root directory of this source tree.\n *\n * @flow\n */\n\nimport {createContext, useContext, useDebugValue} from 'react';\n\nexport const ThemeContext = createContext('bright');\n\nexport default function useTheme() {\n  const theme = useContext(ThemeContext);\n  useDebugValue(theme);\n  return theme;\n}\n"]}}]}
\ No newline at end of file
diff --git a/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/react-sources-extended/index-map/ComponentUsingHooksIndirectly.js b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/react-sources-extended/index-map/ComponentUsingHooksIndirectly.js
new file mode 100644
index 0000000000000..6925712d17c7c
--- /dev/null
+++ b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/react-sources-extended/index-map/ComponentUsingHooksIndirectly.js
@@ -0,0 +1,45 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.Component = Component;
+
+var _react = _interopRequireWildcard(require("react"));
+
+function _getRequireWildcardCache() { if (typeof WeakMap !== "function") return null; var cache = new WeakMap(); _getRequireWildcardCache = function () { return cache; }; return cache; }
+
+function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } if (obj === null || typeof obj !== "object" && typeof obj !== "function") { return { default: obj }; } var cache = _getRequireWildcardCache(); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) { var desc = hasPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : null; if (desc && (desc.get || desc.set)) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } newObj.default = obj; if (cache) { cache.set(obj, newObj); } return newObj; }
+
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow
+ */
+function Component() {
+  const countState = (0, _react.useState)(0);
+  const count = countState[0];
+  const setCount = countState[1];
+  const darkMode = useIsDarkMode();
+  const [isDarkMode] = darkMode;
+  (0, _react.useEffect)(() => {// ...
+  }, []);
+
+  const handleClick = () => setCount(count + 1);
+
+  return /*#__PURE__*/_react.default.createElement(_react.default.Fragment, null, /*#__PURE__*/_react.default.createElement("div", null, "Dark mode? ", isDarkMode), /*#__PURE__*/_react.default.createElement("div", null, "Count: ", count), /*#__PURE__*/_react.default.createElement("button", {
+    onClick: handleClick
+  }, "Update count"));
+}
+
+function useIsDarkMode() {
+  const darkModeState = (0, _react.useState)(false);
+  const [isDarkMode] = darkModeState;
+  (0, _react.useEffect)(function useEffectCreate() {// Here is where we may listen to a "theme" event...
+  }, []);
+  return [isDarkMode, () => {}];
+}
+//# sourceMappingURL=ComponentUsingHooksIndirectly.js.map
\ No newline at end of file
diff --git a/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/react-sources-extended/index-map/ComponentUsingHooksIndirectly.js.map b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/react-sources-extended/index-map/ComponentUsingHooksIndirectly.js.map
new file mode 100644
index 0000000000000..30c31a58f8092
--- /dev/null
+++ b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/react-sources-extended/index-map/ComponentUsingHooksIndirectly.js.map
@@ -0,0 +1 @@
+{"version":3,"sections":[{"offset":{"line":0,"column":0},"map":{"version":3,"sources":["ComponentUsingHooksIndirectly.js"],"names":["Component","countState","count","setCount","darkMode","useIsDarkMode","isDarkMode","handleClick","darkModeState","useEffectCreate"],"mappings":";;;;;;;AASA;;;;;;AATA;;;;;;;;AAWO,SAASA,SAAT,GAAqB;AAC1B,QAAMC,UAAU,GAAG,qBAAS,CAAT,CAAnB;AACA,QAAMC,KAAK,GAAGD,UAAU,CAAC,CAAD,CAAxB;AACA,QAAME,QAAQ,GAAGF,UAAU,CAAC,CAAD,CAA3B;AAEA,QAAMG,QAAQ,GAAGC,aAAa,EAA9B;AACA,QAAM,CAACC,UAAD,IAAeF,QAArB;AAEA,wBAAU,MAAM,CACd;AACD,GAFD,EAEG,EAFH;;AAIA,QAAMG,WAAW,GAAG,MAAMJ,QAAQ,CAACD,KAAK,GAAG,CAAT,CAAlC;;AAEA,sBACE,yEACE,yDAAiBI,UAAjB,CADF,eAEE,qDAAaJ,KAAb,CAFF,eAGE;AAAQ,IAAA,OAAO,EAAEK;AAAjB,oBAHF,CADF;AAOD;;AAED,SAASF,aAAT,GAAyB;AACvB,QAAMG,aAAa,GAAG,qBAAS,KAAT,CAAtB;AACA,QAAM,CAACF,UAAD,IAAeE,aAArB;AAEA,wBAAU,SAASC,eAAT,GAA2B,CACnC;AACD,GAFD,EAEG,EAFH;AAIA,SAAO,CAACH,UAAD,EAAa,MAAM,CAAE,CAArB,CAAP;AACD","sourcesContent":["/**\n * Copyright (c) Facebook, Inc. and its affiliates.\n *\n * This source code is licensed under the MIT license found in the\n * LICENSE file in the root directory of this source tree.\n *\n * @flow\n */\n\nimport React, {useEffect, useState} from 'react';\n\nexport function Component() {\n  const countState = useState(0);\n  const count = countState[0];\n  const setCount = countState[1];\n\n  const darkMode = useIsDarkMode();\n  const [isDarkMode] = darkMode;\n\n  useEffect(() => {\n    // ...\n  }, []);\n\n  const handleClick = () => setCount(count + 1);\n\n  return (\n    <>\n      <div>Dark mode? {isDarkMode}</div>\n      <div>Count: {count}</div>\n      <button onClick={handleClick}>Update count</button>\n    </>\n  );\n}\n\nfunction useIsDarkMode() {\n  const darkModeState = useState(false);\n  const [isDarkMode] = darkModeState;\n\n  useEffect(function useEffectCreate() {\n    // Here is where we may listen to a \"theme\" event...\n  }, []);\n\n  return [isDarkMode, () => {}];\n}\n"],"x_react_sources":[[{"names":["<no-hook>","count","darkMode","isDarkMode"],"mappings":"CAAD;aqBCA,AWDA;iBbEA,AeFA;oCVGA,AeHA"}]]}}]}
\ No newline at end of file
diff --git a/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/react-sources-extended/index-map/ComponentWithCustomHook.js b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/react-sources-extended/index-map/ComponentWithCustomHook.js
new file mode 100644
index 0000000000000..e326d7a4962d5
--- /dev/null
+++ b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/react-sources-extended/index-map/ComponentWithCustomHook.js
@@ -0,0 +1,41 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.Component = Component;
+
+var _react = _interopRequireWildcard(require("react"));
+
+function _getRequireWildcardCache() { if (typeof WeakMap !== "function") return null; var cache = new WeakMap(); _getRequireWildcardCache = function () { return cache; }; return cache; }
+
+function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } if (obj === null || typeof obj !== "object" && typeof obj !== "function") { return { default: obj }; } var cache = _getRequireWildcardCache(); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) { var desc = hasPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : null; if (desc && (desc.get || desc.set)) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } newObj.default = obj; if (cache) { cache.set(obj, newObj); } return newObj; }
+
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow
+ */
+function Component() {
+  const [count, setCount] = (0, _react.useState)(0);
+  const isDarkMode = useIsDarkMode();
+  (0, _react.useEffect)(() => {// ...
+  }, []);
+
+  const handleClick = () => setCount(count + 1);
+
+  return /*#__PURE__*/_react.default.createElement(_react.default.Fragment, null, /*#__PURE__*/_react.default.createElement("div", null, "Dark mode? ", isDarkMode), /*#__PURE__*/_react.default.createElement("div", null, "Count: ", count), /*#__PURE__*/_react.default.createElement("button", {
+    onClick: handleClick
+  }, "Update count"));
+}
+
+function useIsDarkMode() {
+  const [isDarkMode] = (0, _react.useState)(false);
+  (0, _react.useEffect)(function useEffectCreate() {// Here is where we may listen to a "theme" event...
+  }, []);
+  return isDarkMode;
+}
+//# sourceMappingURL=ComponentWithCustomHook.js.map
\ No newline at end of file
diff --git a/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/react-sources-extended/index-map/ComponentWithCustomHook.js.map b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/react-sources-extended/index-map/ComponentWithCustomHook.js.map
new file mode 100644
index 0000000000000..8a1b03d5ecb9d
--- /dev/null
+++ b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/react-sources-extended/index-map/ComponentWithCustomHook.js.map
@@ -0,0 +1 @@
+{"version":3,"sections":[{"offset":{"line":0,"column":0},"map":{"version":3,"sources":["ComponentWithCustomHook.js"],"names":["Component","count","setCount","isDarkMode","useIsDarkMode","handleClick","useEffectCreate"],"mappings":";;;;;;;AASA;;;;;;AATA;;;;;;;;AAWO,SAASA,SAAT,GAAqB;AAC1B,QAAM,CAACC,KAAD,EAAQC,QAAR,IAAoB,qBAAS,CAAT,CAA1B;AACA,QAAMC,UAAU,GAAGC,aAAa,EAAhC;AAEA,wBAAU,MAAM,CACd;AACD,GAFD,EAEG,EAFH;;AAIA,QAAMC,WAAW,GAAG,MAAMH,QAAQ,CAACD,KAAK,GAAG,CAAT,CAAlC;;AAEA,sBACE,yEACE,yDAAiBE,UAAjB,CADF,eAEE,qDAAaF,KAAb,CAFF,eAGE;AAAQ,IAAA,OAAO,EAAEI;AAAjB,oBAHF,CADF;AAOD;;AAED,SAASD,aAAT,GAAyB;AACvB,QAAM,CAACD,UAAD,IAAe,qBAAS,KAAT,CAArB;AAEA,wBAAU,SAASG,eAAT,GAA2B,CACnC;AACD,GAFD,EAEG,EAFH;AAIA,SAAOH,UAAP;AACD","sourcesContent":["/**\n * Copyright (c) Facebook, Inc. and its affiliates.\n *\n * This source code is licensed under the MIT license found in the\n * LICENSE file in the root directory of this source tree.\n *\n * @flow\n */\n\nimport React, {useEffect, useState} from 'react';\n\nexport function Component() {\n  const [count, setCount] = useState(0);\n  const isDarkMode = useIsDarkMode();\n\n  useEffect(() => {\n    // ...\n  }, []);\n\n  const handleClick = () => setCount(count + 1);\n\n  return (\n    <>\n      <div>Dark mode? {isDarkMode}</div>\n      <div>Count: {count}</div>\n      <button onClick={handleClick}>Update count</button>\n    </>\n  );\n}\n\nfunction useIsDarkMode() {\n  const [isDarkMode] = useState(false);\n\n  useEffect(function useEffectCreate() {\n    // Here is where we may listen to a \"theme\" event...\n  }, []);\n\n  return isDarkMode;\n}\n"],"x_react_sources":[[{"names":["<no-hook>","count","isDarkMode"],"mappings":"CAAD;a4BCA,AWDA;clBEA,AeFA;gCbEA,AeFA"}]]}}]}
\ No newline at end of file
diff --git a/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/react-sources-extended/index-map/ComponentWithExternalCustomHooks.js b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/react-sources-extended/index-map/ComponentWithExternalCustomHooks.js
new file mode 100644
index 0000000000000..05aedb938b715
--- /dev/null
+++ b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/react-sources-extended/index-map/ComponentWithExternalCustomHooks.js
@@ -0,0 +1,26 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.Component = Component;
+
+var _react = _interopRequireDefault(require("react"));
+
+var _useTheme = _interopRequireDefault(require("./useTheme"));
+
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
+
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow
+ */
+function Component() {
+  const theme = (0, _useTheme.default)();
+  return /*#__PURE__*/_react.default.createElement("div", null, "theme: ", theme);
+}
+//# sourceMappingURL=ComponentWithExternalCustomHooks.js.map
\ No newline at end of file
diff --git a/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/react-sources-extended/index-map/ComponentWithExternalCustomHooks.js.map b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/react-sources-extended/index-map/ComponentWithExternalCustomHooks.js.map
new file mode 100644
index 0000000000000..7ea1aae90dbd4
--- /dev/null
+++ b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/react-sources-extended/index-map/ComponentWithExternalCustomHooks.js.map
@@ -0,0 +1 @@
+{"version":3,"sections":[{"offset":{"line":0,"column":0},"map":{"version":3,"sources":["ComponentWithExternalCustomHooks.js"],"names":["Component","theme"],"mappings":";;;;;;;AASA;;AACA;;;;AAVA;;;;;;;;AAYO,SAASA,SAAT,GAAqB;AAC1B,QAAMC,KAAK,GAAG,wBAAd;AAEA,sBAAO,qDAAaA,KAAb,CAAP;AACD","sourcesContent":["/**\n * Copyright (c) Facebook, Inc. and its affiliates.\n *\n * This source code is licensed under the MIT license found in the\n * LICENSE file in the root directory of this source tree.\n *\n * @flow\n */\n\nimport React from 'react';\nimport useTheme from './useTheme';\n\nexport function Component() {\n  const theme = useTheme();\n\n  return <div>theme: {theme}</div>;\n}\n"],"x_react_sources":[[{"names":["<no-hook>","theme"],"mappings":"CAAD;cgBCA,AUDA"}]]}}]}
\ No newline at end of file
diff --git a/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/react-sources-extended/index-map/ComponentWithMultipleHooksPerLine.js b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/react-sources-extended/index-map/ComponentWithMultipleHooksPerLine.js
new file mode 100644
index 0000000000000..c657f3eb54551
--- /dev/null
+++ b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/react-sources-extended/index-map/ComponentWithMultipleHooksPerLine.js
@@ -0,0 +1,30 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.Component = Component;
+
+var _react = require("react");
+
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow
+ */
+const A = /*#__PURE__*/(0, _react.createContext)(1);
+const B = /*#__PURE__*/(0, _react.createContext)(2);
+
+function Component() {
+  const a = (0, _react.useContext)(A);
+  const b = (0, _react.useContext)(B); // prettier-ignore
+
+  const c = (0, _react.useContext)(A),
+        d = (0, _react.useContext)(B); // eslint-disable-line one-var
+
+  return a + b + c + d;
+}
+//# sourceMappingURL=ComponentWithMultipleHooksPerLine.js.map
\ No newline at end of file
diff --git a/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/react-sources-extended/index-map/ComponentWithMultipleHooksPerLine.js.map b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/react-sources-extended/index-map/ComponentWithMultipleHooksPerLine.js.map
new file mode 100644
index 0000000000000..0997c5427a1b1
--- /dev/null
+++ b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/react-sources-extended/index-map/ComponentWithMultipleHooksPerLine.js.map
@@ -0,0 +1 @@
+{"version":3,"sections":[{"offset":{"line":0,"column":0},"map":{"version":3,"sources":["ComponentWithMultipleHooksPerLine.js"],"names":["A","B","Component","a","b","c","d"],"mappings":";;;;;;;AASA;;AATA;;;;;;;;AAWA,MAAMA,CAAC,gBAAG,0BAAc,CAAd,CAAV;AACA,MAAMC,CAAC,gBAAG,0BAAc,CAAd,CAAV;;AAEO,SAASC,SAAT,GAAqB;AAC1B,QAAMC,CAAC,GAAG,uBAAWH,CAAX,CAAV;AACA,QAAMI,CAAC,GAAG,uBAAWH,CAAX,CAAV,CAF0B,CAI1B;;AACA,QAAMI,CAAC,GAAG,uBAAWL,CAAX,CAAV;AAAA,QAAyBM,CAAC,GAAG,uBAAWL,CAAX,CAA7B,CAL0B,CAKkB;;AAE5C,SAAOE,CAAC,GAAGC,CAAJ,GAAQC,CAAR,GAAYC,CAAnB;AACD","sourcesContent":["/**\n * Copyright (c) Facebook, Inc. and its affiliates.\n *\n * This source code is licensed under the MIT license found in the\n * LICENSE file in the root directory of this source tree.\n *\n * @flow\n */\n\nimport {createContext, useContext} from 'react';\n\nconst A = createContext(1);\nconst B = createContext(2);\n\nexport function Component() {\n  const a = useContext(A);\n  const b = useContext(B);\n\n  // prettier-ignore\n  const c = useContext(A), d = useContext(B); // eslint-disable-line one-var\n\n  return a + b + c + d;\n}\n"],"x_react_sources":[[{"names":["<no-hook>","a","b","c","d"],"mappings":"CAAD;gBYCA,AaDA;iBbEA,AaFA;oBbGA,AaHA,AMIA,AaJA"}]]}}]}
\ No newline at end of file
diff --git a/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/react-sources-extended/index-map/ComponentWithNestedHooks.js b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/react-sources-extended/index-map/ComponentWithNestedHooks.js
new file mode 100644
index 0000000000000..3cfed69078a8c
--- /dev/null
+++ b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/react-sources-extended/index-map/ComponentWithNestedHooks.js
@@ -0,0 +1,28 @@
+"use strict";
+
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow
+ */
+const {
+  useMemo,
+  useState
+} = require('react');
+
+function Component(props) {
+  const InnerComponent = useMemo(() => () => {
+    const [state] = useState(0);
+    return state;
+  });
+  props.callback(InnerComponent);
+  return null;
+}
+
+module.exports = {
+  Component
+};
+//# sourceMappingURL=ComponentWithNestedHooks.js.map
\ No newline at end of file
diff --git a/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/react-sources-extended/index-map/ComponentWithNestedHooks.js.map b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/react-sources-extended/index-map/ComponentWithNestedHooks.js.map
new file mode 100644
index 0000000000000..76a6e4b84fd7d
--- /dev/null
+++ b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/react-sources-extended/index-map/ComponentWithNestedHooks.js.map
@@ -0,0 +1 @@
+{"version":3,"sections":[{"offset":{"line":0,"column":0},"map":{"version":3,"sources":["ComponentWithNestedHooks.js"],"names":["useMemo","useState","require","Component","props","InnerComponent","state","callback","module","exports"],"mappings":";;AAAA;;;;;;;;AAQA,MAAM;AAACA,EAAAA,OAAD;AAAUC,EAAAA;AAAV,IAAsBC,OAAO,CAAC,OAAD,CAAnC;;AAEA,SAASC,SAAT,CAAmBC,KAAnB,EAA0B;AACxB,QAAMC,cAAc,GAAGL,OAAO,CAAC,MAAM,MAAM;AACzC,UAAM,CAACM,KAAD,IAAUL,QAAQ,CAAC,CAAD,CAAxB;AAEA,WAAOK,KAAP;AACD,GAJ6B,CAA9B;AAKAF,EAAAA,KAAK,CAACG,QAAN,CAAeF,cAAf;AAEA,SAAO,IAAP;AACD;;AAEDG,MAAM,CAACC,OAAP,GAAiB;AAACN,EAAAA;AAAD,CAAjB","sourcesContent":["/**\n * Copyright (c) Facebook, Inc. and its affiliates.\n *\n * This source code is licensed under the MIT license found in the\n * LICENSE file in the root directory of this source tree.\n *\n * @flow\n */\nconst {useMemo, useState} = require('react');\n\nfunction Component(props) {\n  const InnerComponent = useMemo(() => () => {\n    const [state] = useState(0);\n\n    return state;\n  });\n  props.callback(InnerComponent);\n\n  return null;\n}\n\nmodule.exports = {Component};\n"],"x_react_sources":[[{"names":["<no-hook>","InnerComponent","state"],"mappings":"CAAD;YyBCA;aLCA,AWDA;gB3BDA"}]]}}]}
\ No newline at end of file
diff --git a/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/react-sources-extended/index-map/ContainingStringSourceMappingURL.js b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/react-sources-extended/index-map/ContainingStringSourceMappingURL.js
new file mode 100644
index 0000000000000..0fc2c078ca125
--- /dev/null
+++ b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/react-sources-extended/index-map/ContainingStringSourceMappingURL.js
@@ -0,0 +1,29 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.Component = Component;
+
+var _react = _interopRequireWildcard(require("react"));
+
+function _getRequireWildcardCache() { if (typeof WeakMap !== "function") return null; var cache = new WeakMap(); _getRequireWildcardCache = function () { return cache; }; return cache; }
+
+function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } if (obj === null || typeof obj !== "object" && typeof obj !== "function") { return { default: obj }; } var cache = _getRequireWildcardCache(); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) { var desc = hasPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : null; if (desc && (desc.get || desc.set)) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } newObj.default = obj; if (cache) { cache.set(obj, newObj); } return newObj; }
+
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow
+ */
+// ?sourceMappingURL=([^\s'"]+)/gm
+function Component() {
+  const [count, setCount] = (0, _react.useState)(0);
+  return /*#__PURE__*/_react.default.createElement("div", null, /*#__PURE__*/_react.default.createElement("p", null, "You clicked ", count, " times"), /*#__PURE__*/_react.default.createElement("button", {
+    onClick: () => setCount(count + 1)
+  }, "Click me"));
+}
+//# sourceMappingURL=ContainingStringSourceMappingURL.js.map
\ No newline at end of file
diff --git a/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/react-sources-extended/index-map/ContainingStringSourceMappingURL.js.map b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/react-sources-extended/index-map/ContainingStringSourceMappingURL.js.map
new file mode 100644
index 0000000000000..af99c1269ad9e
--- /dev/null
+++ b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/react-sources-extended/index-map/ContainingStringSourceMappingURL.js.map
@@ -0,0 +1 @@
+{"version":3,"sections":[{"offset":{"line":0,"column":0},"map":{"version":3,"sources":["ContainingStringSourceMappingURL.js"],"names":["Component","count","setCount"],"mappings":";;;;;;;AASA;;;;;;AATA;;;;;;;;AAWA;AAEO,SAASA,SAAT,GAAqB;AAC1B,QAAM,CAACC,KAAD,EAAQC,QAAR,IAAoB,qBAAS,CAAT,CAA1B;AAEA,sBACE,uDACE,wDAAgBD,KAAhB,WADF,eAEE;AAAQ,IAAA,OAAO,EAAE,MAAMC,QAAQ,CAACD,KAAK,GAAG,CAAT;AAA/B,gBAFF,CADF;AAMD","sourcesContent":["/**\n * Copyright (c) Facebook, Inc. and its affiliates.\n *\n * This source code is licensed under the MIT license found in the\n * LICENSE file in the root directory of this source tree.\n *\n * @flow\n */\n\nimport React, {useState} from 'react';\n\n// ?sourceMappingURL=([^\\s'\"]+)/gm\n\nexport function Component() {\n  const [count, setCount] = useState(0);\n\n  return (\n    <div>\n      <p>You clicked {count} times</p>\n      <button onClick={() => setCount(count + 1)}>Click me</button>\n    </div>\n  );\n}\n"],"x_react_sources":[[{"names":["<no-hook>","count"],"mappings":"CAAD;e4BCA,AWDA"}]]}}]}
\ No newline at end of file
diff --git a/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/react-sources-extended/index-map/Example.js b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/react-sources-extended/index-map/Example.js
new file mode 100644
index 0000000000000..19134738824bc
--- /dev/null
+++ b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/react-sources-extended/index-map/Example.js
@@ -0,0 +1,28 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.Component = Component;
+
+var _react = _interopRequireWildcard(require("react"));
+
+function _getRequireWildcardCache() { if (typeof WeakMap !== "function") return null; var cache = new WeakMap(); _getRequireWildcardCache = function () { return cache; }; return cache; }
+
+function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } if (obj === null || typeof obj !== "object" && typeof obj !== "function") { return { default: obj }; } var cache = _getRequireWildcardCache(); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) { var desc = hasPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : null; if (desc && (desc.get || desc.set)) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } newObj.default = obj; if (cache) { cache.set(obj, newObj); } return newObj; }
+
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow
+ */
+function Component() {
+  const [count, setCount] = (0, _react.useState)(0);
+  return /*#__PURE__*/_react.default.createElement("div", null, /*#__PURE__*/_react.default.createElement("p", null, "You clicked ", count, " times"), /*#__PURE__*/_react.default.createElement("button", {
+    onClick: () => setCount(count + 1)
+  }, "Click me"));
+}
+//# sourceMappingURL=Example.js.map
\ No newline at end of file
diff --git a/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/react-sources-extended/index-map/Example.js.map b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/react-sources-extended/index-map/Example.js.map
new file mode 100644
index 0000000000000..db5732f03e8ce
--- /dev/null
+++ b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/react-sources-extended/index-map/Example.js.map
@@ -0,0 +1 @@
+{"version":3,"sections":[{"offset":{"line":0,"column":0},"map":{"version":3,"sources":["Example.js"],"names":["Component","count","setCount"],"mappings":";;;;;;;AASA;;;;;;AATA;;;;;;;;AAWO,SAASA,SAAT,GAAqB;AAC1B,QAAM,CAACC,KAAD,EAAQC,QAAR,IAAoB,qBAAS,CAAT,CAA1B;AAEA,sBACE,uDACE,wDAAgBD,KAAhB,WADF,eAEE;AAAQ,IAAA,OAAO,EAAE,MAAMC,QAAQ,CAACD,KAAK,GAAG,CAAT;AAA/B,gBAFF,CADF;AAMD","sourcesContent":["/**\n * Copyright (c) Facebook, Inc. and its affiliates.\n *\n * This source code is licensed under the MIT license found in the\n * LICENSE file in the root directory of this source tree.\n *\n * @flow\n */\n\nimport React, {useState} from 'react';\n\nexport function Component() {\n  const [count, setCount] = useState(0);\n\n  return (\n    <div>\n      <p>You clicked {count} times</p>\n      <button onClick={() => setCount(count + 1)}>Click me</button>\n    </div>\n  );\n}\n"],"x_react_sources":[[{"names":["<no-hook>","count"],"mappings":"CAAD;a4BCA,AWDA"}]]}}]}
\ No newline at end of file
diff --git a/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/react-sources-extended/index-map/InlineRequire.js b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/react-sources-extended/index-map/InlineRequire.js
new file mode 100644
index 0000000000000..388aeda62b308
--- /dev/null
+++ b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/react-sources-extended/index-map/InlineRequire.js
@@ -0,0 +1,21 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.Component = Component;
+
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow
+ */
+function Component() {
+  const [count] = require('react').useState(0);
+
+  return count;
+}
+//# sourceMappingURL=InlineRequire.js.map
\ No newline at end of file
diff --git a/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/react-sources-extended/index-map/InlineRequire.js.map b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/react-sources-extended/index-map/InlineRequire.js.map
new file mode 100644
index 0000000000000..226c9067d5afb
--- /dev/null
+++ b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/react-sources-extended/index-map/InlineRequire.js.map
@@ -0,0 +1 @@
+{"version":3,"sections":[{"offset":{"line":0,"column":0},"map":{"version":3,"sources":["InlineRequire.js"],"names":["Component","count","require","useState"],"mappings":";;;;;;;AAAA;;;;;;;;AASO,SAASA,SAAT,GAAqB;AAC1B,QAAM,CAACC,KAAD,IAAUC,OAAO,CAAC,OAAD,CAAP,CAAiBC,QAAjB,CAA0B,CAA1B,CAAhB;;AAEA,SAAOF,KAAP;AACD","sourcesContent":["/**\n * Copyright (c) Facebook, Inc. and its affiliates.\n *\n * This source code is licensed under the MIT license found in the\n * LICENSE file in the root directory of this source tree.\n *\n * @flow\n */\n\nexport function Component() {\n  const [count] = require('react').useState(0);\n\n  return count;\n}\n"],"x_react_sources":[[{"names":["<no-hook>"],"mappings":"CAAD"}]]}}]}
\ No newline at end of file
diff --git a/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/react-sources-extended/index-map/ToDoList.js b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/react-sources-extended/index-map/ToDoList.js
new file mode 100644
index 0000000000000..a6eb863b661ff
--- /dev/null
+++ b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/react-sources-extended/index-map/ToDoList.js
@@ -0,0 +1,106 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.ListItem = ListItem;
+exports.List = List;
+
+var React = _interopRequireWildcard(require("react"));
+
+function _getRequireWildcardCache() { if (typeof WeakMap !== "function") return null; var cache = new WeakMap(); _getRequireWildcardCache = function () { return cache; }; return cache; }
+
+function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } if (obj === null || typeof obj !== "object" && typeof obj !== "function") { return { default: obj }; } var cache = _getRequireWildcardCache(); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) { var desc = hasPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : null; if (desc && (desc.get || desc.set)) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } newObj.default = obj; if (cache) { cache.set(obj, newObj); } return newObj; }
+
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow
+ */
+function ListItem({
+  item,
+  removeItem,
+  toggleItem
+}) {
+  const handleDelete = (0, React.useCallback)(() => {
+    removeItem(item);
+  }, [item, removeItem]);
+  const handleToggle = (0, React.useCallback)(() => {
+    toggleItem(item);
+  }, [item, toggleItem]);
+  return /*#__PURE__*/React.createElement("li", null, /*#__PURE__*/React.createElement("button", {
+    onClick: handleDelete
+  }, "Delete"), /*#__PURE__*/React.createElement("label", null, /*#__PURE__*/React.createElement("input", {
+    checked: item.isComplete,
+    onChange: handleToggle,
+    type: "checkbox"
+  }), ' ', item.text));
+}
+
+function List(props) {
+  const [newItemText, setNewItemText] = (0, React.useState)('');
+  const [items, setItems] = (0, React.useState)([{
+    id: 1,
+    isComplete: true,
+    text: 'First'
+  }, {
+    id: 2,
+    isComplete: true,
+    text: 'Second'
+  }, {
+    id: 3,
+    isComplete: false,
+    text: 'Third'
+  }]);
+  const [uid, setUID] = (0, React.useState)(4);
+  const handleClick = (0, React.useCallback)(() => {
+    if (newItemText !== '') {
+      setItems([...items, {
+        id: uid,
+        isComplete: false,
+        text: newItemText
+      }]);
+      setUID(uid + 1);
+      setNewItemText('');
+    }
+  }, [newItemText, items, uid]);
+  const handleKeyPress = (0, React.useCallback)(event => {
+    if (event.key === 'Enter') {
+      handleClick();
+    }
+  }, [handleClick]);
+  const handleChange = (0, React.useCallback)(event => {
+    setNewItemText(event.currentTarget.value);
+  }, [setNewItemText]);
+  const removeItem = (0, React.useCallback)(itemToRemove => setItems(items.filter(item => item !== itemToRemove)), [items]);
+  const toggleItem = (0, React.useCallback)(itemToToggle => {
+    // Dont use indexOf()
+    // because editing props in DevTools creates a new Object.
+    const index = items.findIndex(item => item.id === itemToToggle.id);
+    setItems(items.slice(0, index).concat({ ...itemToToggle,
+      isComplete: !itemToToggle.isComplete
+    }).concat(items.slice(index + 1)));
+  }, [items]);
+  return /*#__PURE__*/React.createElement(React.Fragment, null, /*#__PURE__*/React.createElement("h1", null, "List"), /*#__PURE__*/React.createElement("input", {
+    type: "text",
+    placeholder: "New list item...",
+    value: newItemText,
+    onChange: handleChange,
+    onKeyPress: handleKeyPress
+  }), /*#__PURE__*/React.createElement("button", {
+    disabled: newItemText === '',
+    onClick: handleClick
+  }, /*#__PURE__*/React.createElement("span", {
+    role: "img",
+    "aria-label": "Add item"
+  }, "Add")), /*#__PURE__*/React.createElement("ul", null, items.map(item => /*#__PURE__*/React.createElement(ListItem, {
+    key: item.id,
+    item: item,
+    removeItem: removeItem,
+    toggleItem: toggleItem
+  }))));
+}
+//# sourceMappingURL=ToDoList.js.map
\ No newline at end of file
diff --git a/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/react-sources-extended/index-map/ToDoList.js.map b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/react-sources-extended/index-map/ToDoList.js.map
new file mode 100644
index 0000000000000..6b8439351a94b
--- /dev/null
+++ b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/react-sources-extended/index-map/ToDoList.js.map
@@ -0,0 +1 @@
+{"version":3,"sections":[{"offset":{"line":0,"column":0},"map":{"version":3,"sources":["ToDoList.js"],"names":["ListItem","item","removeItem","toggleItem","handleDelete","handleToggle","isComplete","text","List","props","newItemText","setNewItemText","items","setItems","id","uid","setUID","handleClick","handleKeyPress","event","key","handleChange","currentTarget","value","itemToRemove","filter","itemToToggle","index","findIndex","slice","concat","map"],"mappings":";;;;;;;;AASA;;;;;;AATA;;;;;;;;AAYO,SAASA,QAAT,CAAkB;AAACC,EAAAA,IAAD;AAAOC,EAAAA,UAAP;AAAmBC,EAAAA;AAAnB,CAAlB,EAAkD;AACvD,QAAMC,YAAY,GAAG,uBAAY,MAAM;AACrCF,IAAAA,UAAU,CAACD,IAAD,CAAV;AACD,GAFoB,EAElB,CAACA,IAAD,EAAOC,UAAP,CAFkB,CAArB;AAIA,QAAMG,YAAY,GAAG,uBAAY,MAAM;AACrCF,IAAAA,UAAU,CAACF,IAAD,CAAV;AACD,GAFoB,EAElB,CAACA,IAAD,EAAOE,UAAP,CAFkB,CAArB;AAIA,sBACE,6CACE;AAAQ,IAAA,OAAO,EAAEC;AAAjB,cADF,eAEE,gDACE;AACE,IAAA,OAAO,EAAEH,IAAI,CAACK,UADhB;AAEE,IAAA,QAAQ,EAAED,YAFZ;AAGE,IAAA,IAAI,EAAC;AAHP,IADF,EAKK,GALL,EAMGJ,IAAI,CAACM,IANR,CAFF,CADF;AAaD;;AAEM,SAASC,IAAT,CAAcC,KAAd,EAAqB;AAC1B,QAAM,CAACC,WAAD,EAAcC,cAAd,IAAgC,oBAAS,EAAT,CAAtC;AACA,QAAM,CAACC,KAAD,EAAQC,QAAR,IAAoB,oBAAS,CACjC;AAACC,IAAAA,EAAE,EAAE,CAAL;AAAQR,IAAAA,UAAU,EAAE,IAApB;AAA0BC,IAAAA,IAAI,EAAE;AAAhC,GADiC,EAEjC;AAACO,IAAAA,EAAE,EAAE,CAAL;AAAQR,IAAAA,UAAU,EAAE,IAApB;AAA0BC,IAAAA,IAAI,EAAE;AAAhC,GAFiC,EAGjC;AAACO,IAAAA,EAAE,EAAE,CAAL;AAAQR,IAAAA,UAAU,EAAE,KAApB;AAA2BC,IAAAA,IAAI,EAAE;AAAjC,GAHiC,CAAT,CAA1B;AAKA,QAAM,CAACQ,GAAD,EAAMC,MAAN,IAAgB,oBAAS,CAAT,CAAtB;AAEA,QAAMC,WAAW,GAAG,uBAAY,MAAM;AACpC,QAAIP,WAAW,KAAK,EAApB,EAAwB;AACtBG,MAAAA,QAAQ,CAAC,CACP,GAAGD,KADI,EAEP;AACEE,QAAAA,EAAE,EAAEC,GADN;AAEET,QAAAA,UAAU,EAAE,KAFd;AAGEC,QAAAA,IAAI,EAAEG;AAHR,OAFO,CAAD,CAAR;AAQAM,MAAAA,MAAM,CAACD,GAAG,GAAG,CAAP,CAAN;AACAJ,MAAAA,cAAc,CAAC,EAAD,CAAd;AACD;AACF,GAbmB,EAajB,CAACD,WAAD,EAAcE,KAAd,EAAqBG,GAArB,CAbiB,CAApB;AAeA,QAAMG,cAAc,GAAG,uBACrBC,KAAK,IAAI;AACP,QAAIA,KAAK,CAACC,GAAN,KAAc,OAAlB,EAA2B;AACzBH,MAAAA,WAAW;AACZ;AACF,GALoB,EAMrB,CAACA,WAAD,CANqB,CAAvB;AASA,QAAMI,YAAY,GAAG,uBACnBF,KAAK,IAAI;AACPR,IAAAA,cAAc,CAACQ,KAAK,CAACG,aAAN,CAAoBC,KAArB,CAAd;AACD,GAHkB,EAInB,CAACZ,cAAD,CAJmB,CAArB;AAOA,QAAMT,UAAU,GAAG,uBACjBsB,YAAY,IAAIX,QAAQ,CAACD,KAAK,CAACa,MAAN,CAAaxB,IAAI,IAAIA,IAAI,KAAKuB,YAA9B,CAAD,CADP,EAEjB,CAACZ,KAAD,CAFiB,CAAnB;AAKA,QAAMT,UAAU,GAAG,uBACjBuB,YAAY,IAAI;AACd;AACA;AACA,UAAMC,KAAK,GAAGf,KAAK,CAACgB,SAAN,CAAgB3B,IAAI,IAAIA,IAAI,CAACa,EAAL,KAAYY,YAAY,CAACZ,EAAjD,CAAd;AAEAD,IAAAA,QAAQ,CACND,KAAK,CACFiB,KADH,CACS,CADT,EACYF,KADZ,EAEGG,MAFH,CAEU,EACN,GAAGJ,YADG;AAENpB,MAAAA,UAAU,EAAE,CAACoB,YAAY,CAACpB;AAFpB,KAFV,EAMGwB,MANH,CAMUlB,KAAK,CAACiB,KAAN,CAAYF,KAAK,GAAG,CAApB,CANV,CADM,CAAR;AASD,GAfgB,EAgBjB,CAACf,KAAD,CAhBiB,CAAnB;AAmBA,sBACE,oBAAC,cAAD,qBACE,uCADF,eAEE;AACE,IAAA,IAAI,EAAC,MADP;AAEE,IAAA,WAAW,EAAC,kBAFd;AAGE,IAAA,KAAK,EAAEF,WAHT;AAIE,IAAA,QAAQ,EAAEW,YAJZ;AAKE,IAAA,UAAU,EAAEH;AALd,IAFF,eASE;AAAQ,IAAA,QAAQ,EAAER,WAAW,KAAK,EAAlC;AAAsC,IAAA,OAAO,EAAEO;AAA/C,kBACE;AAAM,IAAA,IAAI,EAAC,KAAX;AAAiB,kBAAW;AAA5B,WADF,CATF,eAcE,gCACGL,KAAK,CAACmB,GAAN,CAAU9B,IAAI,iBACb,oBAAC,QAAD;AACE,IAAA,GAAG,EAAEA,IAAI,CAACa,EADZ;AAEE,IAAA,IAAI,EAAEb,IAFR;AAGE,IAAA,UAAU,EAAEC,UAHd;AAIE,IAAA,UAAU,EAAEC;AAJd,IADD,CADH,CAdF,CADF;AA2BD","sourcesContent":["/**\n * Copyright (c) Facebook, Inc. and its affiliates.\n *\n * This source code is licensed under the MIT license found in the\n * LICENSE file in the root directory of this source tree.\n *\n * @flow\n */\n\nimport * as React from 'react';\nimport {Fragment, useCallback, useState} from 'react';\n\nexport function ListItem({item, removeItem, toggleItem}) {\n  const handleDelete = useCallback(() => {\n    removeItem(item);\n  }, [item, removeItem]);\n\n  const handleToggle = useCallback(() => {\n    toggleItem(item);\n  }, [item, toggleItem]);\n\n  return (\n    <li>\n      <button onClick={handleDelete}>Delete</button>\n      <label>\n        <input\n          checked={item.isComplete}\n          onChange={handleToggle}\n          type=\"checkbox\"\n        />{' '}\n        {item.text}\n      </label>\n    </li>\n  );\n}\n\nexport function List(props) {\n  const [newItemText, setNewItemText] = useState('');\n  const [items, setItems] = useState([\n    {id: 1, isComplete: true, text: 'First'},\n    {id: 2, isComplete: true, text: 'Second'},\n    {id: 3, isComplete: false, text: 'Third'},\n  ]);\n  const [uid, setUID] = useState(4);\n\n  const handleClick = useCallback(() => {\n    if (newItemText !== '') {\n      setItems([\n        ...items,\n        {\n          id: uid,\n          isComplete: false,\n          text: newItemText,\n        },\n      ]);\n      setUID(uid + 1);\n      setNewItemText('');\n    }\n  }, [newItemText, items, uid]);\n\n  const handleKeyPress = useCallback(\n    event => {\n      if (event.key === 'Enter') {\n        handleClick();\n      }\n    },\n    [handleClick],\n  );\n\n  const handleChange = useCallback(\n    event => {\n      setNewItemText(event.currentTarget.value);\n    },\n    [setNewItemText],\n  );\n\n  const removeItem = useCallback(\n    itemToRemove => setItems(items.filter(item => item !== itemToRemove)),\n    [items],\n  );\n\n  const toggleItem = useCallback(\n    itemToToggle => {\n      // Dont use indexOf()\n      // because editing props in DevTools creates a new Object.\n      const index = items.findIndex(item => item.id === itemToToggle.id);\n\n      setItems(\n        items\n          .slice(0, index)\n          .concat({\n            ...itemToToggle,\n            isComplete: !itemToToggle.isComplete,\n          })\n          .concat(items.slice(index + 1)),\n      );\n    },\n    [items],\n  );\n\n  return (\n    <Fragment>\n      <h1>List</h1>\n      <input\n        type=\"text\"\n        placeholder=\"New list item...\"\n        value={newItemText}\n        onChange={handleChange}\n        onKeyPress={handleKeyPress}\n      />\n      <button disabled={newItemText === ''} onClick={handleClick}>\n        <span role=\"img\" aria-label=\"Add item\">\n          Add\n        </span>\n      </button>\n      <ul>\n        {items.map(item => (\n          <ListItem\n            key={item.id}\n            item={item}\n            removeItem={removeItem}\n            toggleItem={toggleItem}\n          />\n        ))}\n      </ul>\n    </Fragment>\n  );\n}\n"],"x_react_sources":[[{"names":["<no-hook>","handleDelete","handleToggle","newItemText","items","uid","handleClick","handleKeyPress","handleChange","removeItem","toggleItem"],"mappings":"CAAD;cuBCA;gBCDA;kBDEA;oBCFA;sCgBGA,AYHA;uCxBIA;2CxBJA;4CoBKA,AWLA;8CbMA;2DSNA;6DNOA;oEtBPA;sEoBQA;2EpBRA;6EkBSA;gFlBTA;kFkBUA;mGlBVA"}]]}}]}
\ No newline at end of file
diff --git a/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/react-sources-extended/index-map/index.js b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/react-sources-extended/index-map/index.js
new file mode 100644
index 0000000000000..a0f706b19fbaf
--- /dev/null
+++ b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/react-sources-extended/index-map/index.js
@@ -0,0 +1,89 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+Object.defineProperty(exports, "ComponentUsingHooksIndirectly", {
+  enumerable: true,
+  get: function () {
+    return _ComponentUsingHooksIndirectly.Component;
+  }
+});
+Object.defineProperty(exports, "ComponentWithCustomHook", {
+  enumerable: true,
+  get: function () {
+    return _ComponentWithCustomHook.Component;
+  }
+});
+Object.defineProperty(exports, "ComponentWithExternalCustomHooks", {
+  enumerable: true,
+  get: function () {
+    return _ComponentWithExternalCustomHooks.Component;
+  }
+});
+Object.defineProperty(exports, "ComponentWithMultipleHooksPerLine", {
+  enumerable: true,
+  get: function () {
+    return _ComponentWithMultipleHooksPerLine.Component;
+  }
+});
+Object.defineProperty(exports, "ComponentWithNestedHooks", {
+  enumerable: true,
+  get: function () {
+    return _ComponentWithNestedHooks.Component;
+  }
+});
+Object.defineProperty(exports, "ContainingStringSourceMappingURL", {
+  enumerable: true,
+  get: function () {
+    return _ContainingStringSourceMappingURL.Component;
+  }
+});
+Object.defineProperty(exports, "Example", {
+  enumerable: true,
+  get: function () {
+    return _Example.Component;
+  }
+});
+Object.defineProperty(exports, "InlineRequire", {
+  enumerable: true,
+  get: function () {
+    return _InlineRequire.Component;
+  }
+});
+Object.defineProperty(exports, "useTheme", {
+  enumerable: true,
+  get: function () {
+    return _useTheme.default;
+  }
+});
+exports.ToDoList = void 0;
+
+var _ComponentUsingHooksIndirectly = require("./ComponentUsingHooksIndirectly");
+
+var _ComponentWithCustomHook = require("./ComponentWithCustomHook");
+
+var _ComponentWithExternalCustomHooks = require("./ComponentWithExternalCustomHooks");
+
+var _ComponentWithMultipleHooksPerLine = require("./ComponentWithMultipleHooksPerLine");
+
+var _ComponentWithNestedHooks = require("./ComponentWithNestedHooks");
+
+var _ContainingStringSourceMappingURL = require("./ContainingStringSourceMappingURL");
+
+var _Example = require("./Example");
+
+var _InlineRequire = require("./InlineRequire");
+
+var ToDoList = _interopRequireWildcard(require("./ToDoList"));
+
+exports.ToDoList = ToDoList;
+
+var _useTheme = _interopRequireDefault(require("./useTheme"));
+
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
+
+function _getRequireWildcardCache() { if (typeof WeakMap !== "function") return null; var cache = new WeakMap(); _getRequireWildcardCache = function () { return cache; }; return cache; }
+
+function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } if (obj === null || typeof obj !== "object" && typeof obj !== "function") { return { default: obj }; } var cache = _getRequireWildcardCache(); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) { var desc = hasPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : null; if (desc && (desc.get || desc.set)) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } newObj.default = obj; if (cache) { cache.set(obj, newObj); } return newObj; }
+//# sourceMappingURL=index.js.map
\ No newline at end of file
diff --git a/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/react-sources-extended/index-map/index.js.map b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/react-sources-extended/index-map/index.js.map
new file mode 100644
index 0000000000000..ee8de07dd2b3a
--- /dev/null
+++ b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/react-sources-extended/index-map/index.js.map
@@ -0,0 +1 @@
+{"version":3,"sections":[{"offset":{"line":0,"column":0},"map":{"version":3,"sources":["index.js"],"names":[],"mappings":";;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;AASA;;AACA;;AACA;;AACA;;AACA;;AACA;;AACA;;AACA;;AACA;;;;AAEA","sourcesContent":["/**\n * Copyright (c) Facebook, Inc. and its affiliates.\n *\n * This source code is licensed under the MIT license found in the\n * LICENSE file in the root directory of this source tree.\n *\n * @flow\n */\n\nexport {Component as ComponentUsingHooksIndirectly} from './ComponentUsingHooksIndirectly';\nexport {Component as ComponentWithCustomHook} from './ComponentWithCustomHook';\nexport {Component as ComponentWithExternalCustomHooks} from './ComponentWithExternalCustomHooks';\nexport {Component as ComponentWithMultipleHooksPerLine} from './ComponentWithMultipleHooksPerLine';\nexport {Component as ComponentWithNestedHooks} from './ComponentWithNestedHooks';\nexport {Component as ContainingStringSourceMappingURL} from './ContainingStringSourceMappingURL';\nexport {Component as Example} from './Example';\nexport {Component as InlineRequire} from './InlineRequire';\nimport * as ToDoList from './ToDoList';\nexport {ToDoList};\nexport {default as useTheme} from './useTheme';\n"],"x_react_sources":[[{"names":["<no-hook>"],"mappings":"CAAD"}]]}}]}
\ No newline at end of file
diff --git a/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/react-sources-extended/index-map/useTheme.js b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/react-sources-extended/index-map/useTheme.js
new file mode 100644
index 0000000000000..95bb454253ec3
--- /dev/null
+++ b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/react-sources-extended/index-map/useTheme.js
@@ -0,0 +1,27 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = useTheme;
+exports.ThemeContext = void 0;
+
+var _react = require("react");
+
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow
+ */
+const ThemeContext = /*#__PURE__*/(0, _react.createContext)('bright');
+exports.ThemeContext = ThemeContext;
+
+function useTheme() {
+  const theme = (0, _react.useContext)(ThemeContext);
+  (0, _react.useDebugValue)(theme);
+  return theme;
+}
+//# sourceMappingURL=useTheme.js.map
\ No newline at end of file
diff --git a/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/react-sources-extended/index-map/useTheme.js.map b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/react-sources-extended/index-map/useTheme.js.map
new file mode 100644
index 0000000000000..e3faa66624474
--- /dev/null
+++ b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/external/react-sources-extended/index-map/useTheme.js.map
@@ -0,0 +1 @@
+{"version":3,"sections":[{"offset":{"line":0,"column":0},"map":{"version":3,"sources":["useTheme.js"],"names":["ThemeContext","useTheme","theme"],"mappings":";;;;;;;;AASA;;AATA;;;;;;;;AAWO,MAAMA,YAAY,gBAAG,0BAAc,QAAd,CAArB;;;AAEQ,SAASC,QAAT,GAAoB;AACjC,QAAMC,KAAK,GAAG,uBAAWF,YAAX,CAAd;AACA,4BAAcE,KAAd;AACA,SAAOA,KAAP;AACD","sourcesContent":["/**\n * Copyright (c) Facebook, Inc. and its affiliates.\n *\n * This source code is licensed under the MIT license found in the\n * LICENSE file in the root directory of this source tree.\n *\n * @flow\n */\n\nimport {createContext, useContext, useDebugValue} from 'react';\n\nexport const ThemeContext = createContext('bright');\n\nexport default function useTheme() {\n  const theme = useContext(ThemeContext);\n  useDebugValue(theme);\n  return theme;\n}\n"],"x_react_sources":[[{"names":["<no-hook>","theme"],"mappings":"CAAD;egBCA,AwBDA"}]]}}]}
\ No newline at end of file
diff --git a/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/inline/fb-sources-extended/index-map/ComponentUsingHooksIndirectly.js b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/inline/fb-sources-extended/index-map/ComponentUsingHooksIndirectly.js
new file mode 100644
index 0000000000000..28a330be5c3d9
--- /dev/null
+++ b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/inline/fb-sources-extended/index-map/ComponentUsingHooksIndirectly.js
@@ -0,0 +1,45 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.Component = Component;
+
+var _react = _interopRequireWildcard(require("react"));
+
+function _getRequireWildcardCache() { if (typeof WeakMap !== "function") return null; var cache = new WeakMap(); _getRequireWildcardCache = function () { return cache; }; return cache; }
+
+function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } if (obj === null || typeof obj !== "object" && typeof obj !== "function") { return { default: obj }; } var cache = _getRequireWildcardCache(); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) { var desc = hasPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : null; if (desc && (desc.get || desc.set)) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } newObj.default = obj; if (cache) { cache.set(obj, newObj); } return newObj; }
+
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow
+ */
+function Component() {
+  const countState = (0, _react.useState)(0);
+  const count = countState[0];
+  const setCount = countState[1];
+  const darkMode = useIsDarkMode();
+  const [isDarkMode] = darkMode;
+  (0, _react.useEffect)(() => {// ...
+  }, []);
+
+  const handleClick = () => setCount(count + 1);
+
+  return /*#__PURE__*/_react.default.createElement(_react.default.Fragment, null, /*#__PURE__*/_react.default.createElement("div", null, "Dark mode? ", isDarkMode), /*#__PURE__*/_react.default.createElement("div", null, "Count: ", count), /*#__PURE__*/_react.default.createElement("button", {
+    onClick: handleClick
+  }, "Update count"));
+}
+
+function useIsDarkMode() {
+  const darkModeState = (0, _react.useState)(false);
+  const [isDarkMode] = darkModeState;
+  (0, _react.useEffect)(function useEffectCreate() {// Here is where we may listen to a "theme" event...
+  }, []);
+  return [isDarkMode, () => {}];
+}
+//# sourceMappingURL=data:application/json;charset=utf-8;base64,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
\ No newline at end of file
diff --git a/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/inline/fb-sources-extended/index-map/ComponentWithCustomHook.js b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/inline/fb-sources-extended/index-map/ComponentWithCustomHook.js
new file mode 100644
index 0000000000000..2b884ae76bf69
--- /dev/null
+++ b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/inline/fb-sources-extended/index-map/ComponentWithCustomHook.js
@@ -0,0 +1,41 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.Component = Component;
+
+var _react = _interopRequireWildcard(require("react"));
+
+function _getRequireWildcardCache() { if (typeof WeakMap !== "function") return null; var cache = new WeakMap(); _getRequireWildcardCache = function () { return cache; }; return cache; }
+
+function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } if (obj === null || typeof obj !== "object" && typeof obj !== "function") { return { default: obj }; } var cache = _getRequireWildcardCache(); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) { var desc = hasPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : null; if (desc && (desc.get || desc.set)) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } newObj.default = obj; if (cache) { cache.set(obj, newObj); } return newObj; }
+
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow
+ */
+function Component() {
+  const [count, setCount] = (0, _react.useState)(0);
+  const isDarkMode = useIsDarkMode();
+  (0, _react.useEffect)(() => {// ...
+  }, []);
+
+  const handleClick = () => setCount(count + 1);
+
+  return /*#__PURE__*/_react.default.createElement(_react.default.Fragment, null, /*#__PURE__*/_react.default.createElement("div", null, "Dark mode? ", isDarkMode), /*#__PURE__*/_react.default.createElement("div", null, "Count: ", count), /*#__PURE__*/_react.default.createElement("button", {
+    onClick: handleClick
+  }, "Update count"));
+}
+
+function useIsDarkMode() {
+  const [isDarkMode] = (0, _react.useState)(false);
+  (0, _react.useEffect)(function useEffectCreate() {// Here is where we may listen to a "theme" event...
+  }, []);
+  return isDarkMode;
+}
+//# sourceMappingURL=data:application/json;charset=utf-8;base64,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
\ No newline at end of file
diff --git a/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/inline/fb-sources-extended/index-map/ComponentWithExternalCustomHooks.js b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/inline/fb-sources-extended/index-map/ComponentWithExternalCustomHooks.js
new file mode 100644
index 0000000000000..5e0f5e80aa1ae
--- /dev/null
+++ b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/inline/fb-sources-extended/index-map/ComponentWithExternalCustomHooks.js
@@ -0,0 +1,26 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.Component = Component;
+
+var _react = _interopRequireDefault(require("react"));
+
+var _useTheme = _interopRequireDefault(require("./useTheme"));
+
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
+
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow
+ */
+function Component() {
+  const theme = (0, _useTheme.default)();
+  return /*#__PURE__*/_react.default.createElement("div", null, "theme: ", theme);
+}
+//# sourceMappingURL=data:application/json;charset=utf-8;base64,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
\ No newline at end of file
diff --git a/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/inline/fb-sources-extended/index-map/ComponentWithMultipleHooksPerLine.js b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/inline/fb-sources-extended/index-map/ComponentWithMultipleHooksPerLine.js
new file mode 100644
index 0000000000000..e1a5c7634e416
--- /dev/null
+++ b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/inline/fb-sources-extended/index-map/ComponentWithMultipleHooksPerLine.js
@@ -0,0 +1,30 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.Component = Component;
+
+var _react = require("react");
+
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow
+ */
+const A = /*#__PURE__*/(0, _react.createContext)(1);
+const B = /*#__PURE__*/(0, _react.createContext)(2);
+
+function Component() {
+  const a = (0, _react.useContext)(A);
+  const b = (0, _react.useContext)(B); // prettier-ignore
+
+  const c = (0, _react.useContext)(A),
+        d = (0, _react.useContext)(B); // eslint-disable-line one-var
+
+  return a + b + c + d;
+}
+//# sourceMappingURL=data:application/json;charset=utf-8;base64,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
\ No newline at end of file
diff --git a/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/inline/fb-sources-extended/index-map/ComponentWithNestedHooks.js b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/inline/fb-sources-extended/index-map/ComponentWithNestedHooks.js
new file mode 100644
index 0000000000000..ffb582426e5e6
--- /dev/null
+++ b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/inline/fb-sources-extended/index-map/ComponentWithNestedHooks.js
@@ -0,0 +1,28 @@
+"use strict";
+
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow
+ */
+const {
+  useMemo,
+  useState
+} = require('react');
+
+function Component(props) {
+  const InnerComponent = useMemo(() => () => {
+    const [state] = useState(0);
+    return state;
+  });
+  props.callback(InnerComponent);
+  return null;
+}
+
+module.exports = {
+  Component
+};
+//# sourceMappingURL=data:application/json;charset=utf-8;base64,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
\ No newline at end of file
diff --git a/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/inline/fb-sources-extended/index-map/ContainingStringSourceMappingURL.js b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/inline/fb-sources-extended/index-map/ContainingStringSourceMappingURL.js
new file mode 100644
index 0000000000000..44f936afc1daf
--- /dev/null
+++ b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/inline/fb-sources-extended/index-map/ContainingStringSourceMappingURL.js
@@ -0,0 +1,29 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.Component = Component;
+
+var _react = _interopRequireWildcard(require("react"));
+
+function _getRequireWildcardCache() { if (typeof WeakMap !== "function") return null; var cache = new WeakMap(); _getRequireWildcardCache = function () { return cache; }; return cache; }
+
+function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } if (obj === null || typeof obj !== "object" && typeof obj !== "function") { return { default: obj }; } var cache = _getRequireWildcardCache(); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) { var desc = hasPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : null; if (desc && (desc.get || desc.set)) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } newObj.default = obj; if (cache) { cache.set(obj, newObj); } return newObj; }
+
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow
+ */
+// ?sourceMappingURL=([^\s'"]+)/gm
+function Component() {
+  const [count, setCount] = (0, _react.useState)(0);
+  return /*#__PURE__*/_react.default.createElement("div", null, /*#__PURE__*/_react.default.createElement("p", null, "You clicked ", count, " times"), /*#__PURE__*/_react.default.createElement("button", {
+    onClick: () => setCount(count + 1)
+  }, "Click me"));
+}
+//# sourceMappingURL=data:application/json;charset=utf-8;base64,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
\ No newline at end of file
diff --git a/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/inline/fb-sources-extended/index-map/Example.js b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/inline/fb-sources-extended/index-map/Example.js
new file mode 100644
index 0000000000000..089cced4b7319
--- /dev/null
+++ b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/inline/fb-sources-extended/index-map/Example.js
@@ -0,0 +1,28 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.Component = Component;
+
+var _react = _interopRequireWildcard(require("react"));
+
+function _getRequireWildcardCache() { if (typeof WeakMap !== "function") return null; var cache = new WeakMap(); _getRequireWildcardCache = function () { return cache; }; return cache; }
+
+function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } if (obj === null || typeof obj !== "object" && typeof obj !== "function") { return { default: obj }; } var cache = _getRequireWildcardCache(); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) { var desc = hasPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : null; if (desc && (desc.get || desc.set)) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } newObj.default = obj; if (cache) { cache.set(obj, newObj); } return newObj; }
+
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow
+ */
+function Component() {
+  const [count, setCount] = (0, _react.useState)(0);
+  return /*#__PURE__*/_react.default.createElement("div", null, /*#__PURE__*/_react.default.createElement("p", null, "You clicked ", count, " times"), /*#__PURE__*/_react.default.createElement("button", {
+    onClick: () => setCount(count + 1)
+  }, "Click me"));
+}
+//# sourceMappingURL=data:application/json;charset=utf-8;base64,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
\ No newline at end of file
diff --git a/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/inline/fb-sources-extended/index-map/InlineRequire.js b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/inline/fb-sources-extended/index-map/InlineRequire.js
new file mode 100644
index 0000000000000..e9293ce11d4f2
--- /dev/null
+++ b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/inline/fb-sources-extended/index-map/InlineRequire.js
@@ -0,0 +1,21 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.Component = Component;
+
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow
+ */
+function Component() {
+  const [count] = require('react').useState(0);
+
+  return count;
+}
+//# sourceMappingURL=data:application/json;charset=utf-8;base64,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
\ No newline at end of file
diff --git a/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/inline/fb-sources-extended/index-map/ToDoList.js b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/inline/fb-sources-extended/index-map/ToDoList.js
new file mode 100644
index 0000000000000..373a057298c1f
--- /dev/null
+++ b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/inline/fb-sources-extended/index-map/ToDoList.js
@@ -0,0 +1,106 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.ListItem = ListItem;
+exports.List = List;
+
+var React = _interopRequireWildcard(require("react"));
+
+function _getRequireWildcardCache() { if (typeof WeakMap !== "function") return null; var cache = new WeakMap(); _getRequireWildcardCache = function () { return cache; }; return cache; }
+
+function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } if (obj === null || typeof obj !== "object" && typeof obj !== "function") { return { default: obj }; } var cache = _getRequireWildcardCache(); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) { var desc = hasPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : null; if (desc && (desc.get || desc.set)) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } newObj.default = obj; if (cache) { cache.set(obj, newObj); } return newObj; }
+
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow
+ */
+function ListItem({
+  item,
+  removeItem,
+  toggleItem
+}) {
+  const handleDelete = (0, React.useCallback)(() => {
+    removeItem(item);
+  }, [item, removeItem]);
+  const handleToggle = (0, React.useCallback)(() => {
+    toggleItem(item);
+  }, [item, toggleItem]);
+  return /*#__PURE__*/React.createElement("li", null, /*#__PURE__*/React.createElement("button", {
+    onClick: handleDelete
+  }, "Delete"), /*#__PURE__*/React.createElement("label", null, /*#__PURE__*/React.createElement("input", {
+    checked: item.isComplete,
+    onChange: handleToggle,
+    type: "checkbox"
+  }), ' ', item.text));
+}
+
+function List(props) {
+  const [newItemText, setNewItemText] = (0, React.useState)('');
+  const [items, setItems] = (0, React.useState)([{
+    id: 1,
+    isComplete: true,
+    text: 'First'
+  }, {
+    id: 2,
+    isComplete: true,
+    text: 'Second'
+  }, {
+    id: 3,
+    isComplete: false,
+    text: 'Third'
+  }]);
+  const [uid, setUID] = (0, React.useState)(4);
+  const handleClick = (0, React.useCallback)(() => {
+    if (newItemText !== '') {
+      setItems([...items, {
+        id: uid,
+        isComplete: false,
+        text: newItemText
+      }]);
+      setUID(uid + 1);
+      setNewItemText('');
+    }
+  }, [newItemText, items, uid]);
+  const handleKeyPress = (0, React.useCallback)(event => {
+    if (event.key === 'Enter') {
+      handleClick();
+    }
+  }, [handleClick]);
+  const handleChange = (0, React.useCallback)(event => {
+    setNewItemText(event.currentTarget.value);
+  }, [setNewItemText]);
+  const removeItem = (0, React.useCallback)(itemToRemove => setItems(items.filter(item => item !== itemToRemove)), [items]);
+  const toggleItem = (0, React.useCallback)(itemToToggle => {
+    // Dont use indexOf()
+    // because editing props in DevTools creates a new Object.
+    const index = items.findIndex(item => item.id === itemToToggle.id);
+    setItems(items.slice(0, index).concat({ ...itemToToggle,
+      isComplete: !itemToToggle.isComplete
+    }).concat(items.slice(index + 1)));
+  }, [items]);
+  return /*#__PURE__*/React.createElement(React.Fragment, null, /*#__PURE__*/React.createElement("h1", null, "List"), /*#__PURE__*/React.createElement("input", {
+    type: "text",
+    placeholder: "New list item...",
+    value: newItemText,
+    onChange: handleChange,
+    onKeyPress: handleKeyPress
+  }), /*#__PURE__*/React.createElement("button", {
+    disabled: newItemText === '',
+    onClick: handleClick
+  }, /*#__PURE__*/React.createElement("span", {
+    role: "img",
+    "aria-label": "Add item"
+  }, "Add")), /*#__PURE__*/React.createElement("ul", null, items.map(item => /*#__PURE__*/React.createElement(ListItem, {
+    key: item.id,
+    item: item,
+    removeItem: removeItem,
+    toggleItem: toggleItem
+  }))));
+}
+//# sourceMappingURL=data:application/json;charset=utf-8;base64,{"version":3,"sections":[{"offset":{"line":0,"column":0},"map":{"version":3,"sources":["ToDoList.js"],"names":["ListItem","item","removeItem","toggleItem","handleDelete","handleToggle","isComplete","text","List","props","newItemText","setNewItemText","items","setItems","id","uid","setUID","handleClick","handleKeyPress","event","key","handleChange","currentTarget","value","itemToRemove","filter","itemToToggle","index","findIndex","slice","concat","map"],"mappings":";;;;;;;;AASA;;;;;;AATA;;;;;;;;AAYO,SAASA,QAAT,CAAkB;AAACC,EAAAA,IAAD;AAAOC,EAAAA,UAAP;AAAmBC,EAAAA;AAAnB,CAAlB,EAAkD;AACvD,QAAMC,YAAY,GAAG,uBAAY,MAAM;AACrCF,IAAAA,UAAU,CAACD,IAAD,CAAV;AACD,GAFoB,EAElB,CAACA,IAAD,EAAOC,UAAP,CAFkB,CAArB;AAIA,QAAMG,YAAY,GAAG,uBAAY,MAAM;AACrCF,IAAAA,UAAU,CAACF,IAAD,CAAV;AACD,GAFoB,EAElB,CAACA,IAAD,EAAOE,UAAP,CAFkB,CAArB;AAIA,sBACE,6CACE;AAAQ,IAAA,OAAO,EAAEC;AAAjB,cADF,eAEE,gDACE;AACE,IAAA,OAAO,EAAEH,IAAI,CAACK,UADhB;AAEE,IAAA,QAAQ,EAAED,YAFZ;AAGE,IAAA,IAAI,EAAC;AAHP,IADF,EAKK,GALL,EAMGJ,IAAI,CAACM,IANR,CAFF,CADF;AAaD;;AAEM,SAASC,IAAT,CAAcC,KAAd,EAAqB;AAC1B,QAAM,CAACC,WAAD,EAAcC,cAAd,IAAgC,oBAAS,EAAT,CAAtC;AACA,QAAM,CAACC,KAAD,EAAQC,QAAR,IAAoB,oBAAS,CACjC;AAACC,IAAAA,EAAE,EAAE,CAAL;AAAQR,IAAAA,UAAU,EAAE,IAApB;AAA0BC,IAAAA,IAAI,EAAE;AAAhC,GADiC,EAEjC;AAACO,IAAAA,EAAE,EAAE,CAAL;AAAQR,IAAAA,UAAU,EAAE,IAApB;AAA0BC,IAAAA,IAAI,EAAE;AAAhC,GAFiC,EAGjC;AAACO,IAAAA,EAAE,EAAE,CAAL;AAAQR,IAAAA,UAAU,EAAE,KAApB;AAA2BC,IAAAA,IAAI,EAAE;AAAjC,GAHiC,CAAT,CAA1B;AAKA,QAAM,CAACQ,GAAD,EAAMC,MAAN,IAAgB,oBAAS,CAAT,CAAtB;AAEA,QAAMC,WAAW,GAAG,uBAAY,MAAM;AACpC,QAAIP,WAAW,KAAK,EAApB,EAAwB;AACtBG,MAAAA,QAAQ,CAAC,CACP,GAAGD,KADI,EAEP;AACEE,QAAAA,EAAE,EAAEC,GADN;AAEET,QAAAA,UAAU,EAAE,KAFd;AAGEC,QAAAA,IAAI,EAAEG;AAHR,OAFO,CAAD,CAAR;AAQAM,MAAAA,MAAM,CAACD,GAAG,GAAG,CAAP,CAAN;AACAJ,MAAAA,cAAc,CAAC,EAAD,CAAd;AACD;AACF,GAbmB,EAajB,CAACD,WAAD,EAAcE,KAAd,EAAqBG,GAArB,CAbiB,CAApB;AAeA,QAAMG,cAAc,GAAG,uBACrBC,KAAK,IAAI;AACP,QAAIA,KAAK,CAACC,GAAN,KAAc,OAAlB,EAA2B;AACzBH,MAAAA,WAAW;AACZ;AACF,GALoB,EAMrB,CAACA,WAAD,CANqB,CAAvB;AASA,QAAMI,YAAY,GAAG,uBACnBF,KAAK,IAAI;AACPR,IAAAA,cAAc,CAACQ,KAAK,CAACG,aAAN,CAAoBC,KAArB,CAAd;AACD,GAHkB,EAInB,CAACZ,cAAD,CAJmB,CAArB;AAOA,QAAMT,UAAU,GAAG,uBACjBsB,YAAY,IAAIX,QAAQ,CAACD,KAAK,CAACa,MAAN,CAAaxB,IAAI,IAAIA,IAAI,KAAKuB,YAA9B,CAAD,CADP,EAEjB,CAACZ,KAAD,CAFiB,CAAnB;AAKA,QAAMT,UAAU,GAAG,uBACjBuB,YAAY,IAAI;AACd;AACA;AACA,UAAMC,KAAK,GAAGf,KAAK,CAACgB,SAAN,CAAgB3B,IAAI,IAAIA,IAAI,CAACa,EAAL,KAAYY,YAAY,CAACZ,EAAjD,CAAd;AAEAD,IAAAA,QAAQ,CACND,KAAK,CACFiB,KADH,CACS,CADT,EACYF,KADZ,EAEGG,MAFH,CAEU,EACN,GAAGJ,YADG;AAENpB,MAAAA,UAAU,EAAE,CAACoB,YAAY,CAACpB;AAFpB,KAFV,EAMGwB,MANH,CAMUlB,KAAK,CAACiB,KAAN,CAAYF,KAAK,GAAG,CAApB,CANV,CADM,CAAR;AASD,GAfgB,EAgBjB,CAACf,KAAD,CAhBiB,CAAnB;AAmBA,sBACE,oBAAC,cAAD,qBACE,uCADF,eAEE;AACE,IAAA,IAAI,EAAC,MADP;AAEE,IAAA,WAAW,EAAC,kBAFd;AAGE,IAAA,KAAK,EAAEF,WAHT;AAIE,IAAA,QAAQ,EAAEW,YAJZ;AAKE,IAAA,UAAU,EAAEH;AALd,IAFF,eASE;AAAQ,IAAA,QAAQ,EAAER,WAAW,KAAK,EAAlC;AAAsC,IAAA,OAAO,EAAEO;AAA/C,kBACE;AAAM,IAAA,IAAI,EAAC,KAAX;AAAiB,kBAAW;AAA5B,WADF,CATF,eAcE,gCACGL,KAAK,CAACmB,GAAN,CAAU9B,IAAI,iBACb,oBAAC,QAAD;AACE,IAAA,GAAG,EAAEA,IAAI,CAACa,EADZ;AAEE,IAAA,IAAI,EAAEb,IAFR;AAGE,IAAA,UAAU,EAAEC,UAHd;AAIE,IAAA,UAAU,EAAEC;AAJd,IADD,CADH,CAdF,CADF;AA2BD","sourcesContent":["/**\n * Copyright (c) Facebook, Inc. and its affiliates.\n *\n * This source code is licensed under the MIT license found in the\n * LICENSE file in the root directory of this source tree.\n *\n * @flow\n */\n\nimport * as React from 'react';\nimport {Fragment, useCallback, useState} from 'react';\n\nexport function ListItem({item, removeItem, toggleItem}) {\n  const handleDelete = useCallback(() => {\n    removeItem(item);\n  }, [item, removeItem]);\n\n  const handleToggle = useCallback(() => {\n    toggleItem(item);\n  }, [item, toggleItem]);\n\n  return (\n    <li>\n      <button onClick={handleDelete}>Delete</button>\n      <label>\n        <input\n          checked={item.isComplete}\n          onChange={handleToggle}\n          type=\"checkbox\"\n        />{' '}\n        {item.text}\n      </label>\n    </li>\n  );\n}\n\nexport function List(props) {\n  const [newItemText, setNewItemText] = useState('');\n  const [items, setItems] = useState([\n    {id: 1, isComplete: true, text: 'First'},\n    {id: 2, isComplete: true, text: 'Second'},\n    {id: 3, isComplete: false, text: 'Third'},\n  ]);\n  const [uid, setUID] = useState(4);\n\n  const handleClick = useCallback(() => {\n    if (newItemText !== '') {\n      setItems([\n        ...items,\n        {\n          id: uid,\n          isComplete: false,\n          text: newItemText,\n        },\n      ]);\n      setUID(uid + 1);\n      setNewItemText('');\n    }\n  }, [newItemText, items, uid]);\n\n  const handleKeyPress = useCallback(\n    event => {\n      if (event.key === 'Enter') {\n        handleClick();\n      }\n    },\n    [handleClick],\n  );\n\n  const handleChange = useCallback(\n    event => {\n      setNewItemText(event.currentTarget.value);\n    },\n    [setNewItemText],\n  );\n\n  const removeItem = useCallback(\n    itemToRemove => setItems(items.filter(item => item !== itemToRemove)),\n    [items],\n  );\n\n  const toggleItem = useCallback(\n    itemToToggle => {\n      // Dont use indexOf()\n      // because editing props in DevTools creates a new Object.\n      const index = items.findIndex(item => item.id === itemToToggle.id);\n\n      setItems(\n        items\n          .slice(0, index)\n          .concat({\n            ...itemToToggle,\n            isComplete: !itemToToggle.isComplete,\n          })\n          .concat(items.slice(index + 1)),\n      );\n    },\n    [items],\n  );\n\n  return (\n    <Fragment>\n      <h1>List</h1>\n      <input\n        type=\"text\"\n        placeholder=\"New list item...\"\n        value={newItemText}\n        onChange={handleChange}\n        onKeyPress={handleKeyPress}\n      />\n      <button disabled={newItemText === ''} onClick={handleClick}>\n        <span role=\"img\" aria-label=\"Add item\">\n          Add\n        </span>\n      </button>\n      <ul>\n        {items.map(item => (\n          <ListItem\n            key={item.id}\n            item={item}\n            removeItem={removeItem}\n            toggleItem={toggleItem}\n          />\n        ))}\n      </ul>\n    </Fragment>\n  );\n}\n"],"x_facebook_sources":[[null,[{"names":["<no-hook>","handleDelete","handleToggle","newItemText","items","uid","handleClick","handleKeyPress","handleChange","removeItem","toggleItem"],"mappings":"CAAD;cuBCA;gBCDA;kBDEA;oBCFA;sCgBGA,AYHA;uCxBIA;2CxBJA;4CoBKA,AWLA;8CbMA;2DSNA;6DNOA;oEtBPA;sEoBQA;2EpBRA;6EkBSA;gFlBTA;kFkBUA;mGlBVA"}]]]}}]}
\ No newline at end of file
diff --git a/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/inline/fb-sources-extended/index-map/index.js b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/inline/fb-sources-extended/index-map/index.js
new file mode 100644
index 0000000000000..59d6d5140c804
--- /dev/null
+++ b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/inline/fb-sources-extended/index-map/index.js
@@ -0,0 +1,89 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+Object.defineProperty(exports, "ComponentUsingHooksIndirectly", {
+  enumerable: true,
+  get: function () {
+    return _ComponentUsingHooksIndirectly.Component;
+  }
+});
+Object.defineProperty(exports, "ComponentWithCustomHook", {
+  enumerable: true,
+  get: function () {
+    return _ComponentWithCustomHook.Component;
+  }
+});
+Object.defineProperty(exports, "ComponentWithExternalCustomHooks", {
+  enumerable: true,
+  get: function () {
+    return _ComponentWithExternalCustomHooks.Component;
+  }
+});
+Object.defineProperty(exports, "ComponentWithMultipleHooksPerLine", {
+  enumerable: true,
+  get: function () {
+    return _ComponentWithMultipleHooksPerLine.Component;
+  }
+});
+Object.defineProperty(exports, "ComponentWithNestedHooks", {
+  enumerable: true,
+  get: function () {
+    return _ComponentWithNestedHooks.Component;
+  }
+});
+Object.defineProperty(exports, "ContainingStringSourceMappingURL", {
+  enumerable: true,
+  get: function () {
+    return _ContainingStringSourceMappingURL.Component;
+  }
+});
+Object.defineProperty(exports, "Example", {
+  enumerable: true,
+  get: function () {
+    return _Example.Component;
+  }
+});
+Object.defineProperty(exports, "InlineRequire", {
+  enumerable: true,
+  get: function () {
+    return _InlineRequire.Component;
+  }
+});
+Object.defineProperty(exports, "useTheme", {
+  enumerable: true,
+  get: function () {
+    return _useTheme.default;
+  }
+});
+exports.ToDoList = void 0;
+
+var _ComponentUsingHooksIndirectly = require("./ComponentUsingHooksIndirectly");
+
+var _ComponentWithCustomHook = require("./ComponentWithCustomHook");
+
+var _ComponentWithExternalCustomHooks = require("./ComponentWithExternalCustomHooks");
+
+var _ComponentWithMultipleHooksPerLine = require("./ComponentWithMultipleHooksPerLine");
+
+var _ComponentWithNestedHooks = require("./ComponentWithNestedHooks");
+
+var _ContainingStringSourceMappingURL = require("./ContainingStringSourceMappingURL");
+
+var _Example = require("./Example");
+
+var _InlineRequire = require("./InlineRequire");
+
+var ToDoList = _interopRequireWildcard(require("./ToDoList"));
+
+exports.ToDoList = ToDoList;
+
+var _useTheme = _interopRequireDefault(require("./useTheme"));
+
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
+
+function _getRequireWildcardCache() { if (typeof WeakMap !== "function") return null; var cache = new WeakMap(); _getRequireWildcardCache = function () { return cache; }; return cache; }
+
+function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } if (obj === null || typeof obj !== "object" && typeof obj !== "function") { return { default: obj }; } var cache = _getRequireWildcardCache(); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) { var desc = hasPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : null; if (desc && (desc.get || desc.set)) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } newObj.default = obj; if (cache) { cache.set(obj, newObj); } return newObj; }
+//# sourceMappingURL=data:application/json;charset=utf-8;base64,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
\ No newline at end of file
diff --git a/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/inline/fb-sources-extended/index-map/useTheme.js b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/inline/fb-sources-extended/index-map/useTheme.js
new file mode 100644
index 0000000000000..ea4be9035be59
--- /dev/null
+++ b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/inline/fb-sources-extended/index-map/useTheme.js
@@ -0,0 +1,27 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = useTheme;
+exports.ThemeContext = void 0;
+
+var _react = require("react");
+
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow
+ */
+const ThemeContext = /*#__PURE__*/(0, _react.createContext)('bright');
+exports.ThemeContext = ThemeContext;
+
+function useTheme() {
+  const theme = (0, _react.useContext)(ThemeContext);
+  (0, _react.useDebugValue)(theme);
+  return theme;
+}
+//# sourceMappingURL=data:application/json;charset=utf-8;base64,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
\ No newline at end of file
diff --git a/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/inline/index-map/ComponentUsingHooksIndirectly.js b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/inline/index-map/ComponentUsingHooksIndirectly.js
new file mode 100644
index 0000000000000..9a692ae237225
--- /dev/null
+++ b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/inline/index-map/ComponentUsingHooksIndirectly.js
@@ -0,0 +1,45 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.Component = Component;
+
+var _react = _interopRequireWildcard(require("react"));
+
+function _getRequireWildcardCache() { if (typeof WeakMap !== "function") return null; var cache = new WeakMap(); _getRequireWildcardCache = function () { return cache; }; return cache; }
+
+function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } if (obj === null || typeof obj !== "object" && typeof obj !== "function") { return { default: obj }; } var cache = _getRequireWildcardCache(); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) { var desc = hasPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : null; if (desc && (desc.get || desc.set)) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } newObj.default = obj; if (cache) { cache.set(obj, newObj); } return newObj; }
+
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow
+ */
+function Component() {
+  const countState = (0, _react.useState)(0);
+  const count = countState[0];
+  const setCount = countState[1];
+  const darkMode = useIsDarkMode();
+  const [isDarkMode] = darkMode;
+  (0, _react.useEffect)(() => {// ...
+  }, []);
+
+  const handleClick = () => setCount(count + 1);
+
+  return /*#__PURE__*/_react.default.createElement(_react.default.Fragment, null, /*#__PURE__*/_react.default.createElement("div", null, "Dark mode? ", isDarkMode), /*#__PURE__*/_react.default.createElement("div", null, "Count: ", count), /*#__PURE__*/_react.default.createElement("button", {
+    onClick: handleClick
+  }, "Update count"));
+}
+
+function useIsDarkMode() {
+  const darkModeState = (0, _react.useState)(false);
+  const [isDarkMode] = darkModeState;
+  (0, _react.useEffect)(function useEffectCreate() {// Here is where we may listen to a "theme" event...
+  }, []);
+  return [isDarkMode, () => {}];
+}
+//# sourceMappingURL=data:application/json;charset=utf-8;base64,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
\ No newline at end of file
diff --git a/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/inline/index-map/ComponentWithCustomHook.js b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/inline/index-map/ComponentWithCustomHook.js
new file mode 100644
index 0000000000000..864e75084321b
--- /dev/null
+++ b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/inline/index-map/ComponentWithCustomHook.js
@@ -0,0 +1,41 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.Component = Component;
+
+var _react = _interopRequireWildcard(require("react"));
+
+function _getRequireWildcardCache() { if (typeof WeakMap !== "function") return null; var cache = new WeakMap(); _getRequireWildcardCache = function () { return cache; }; return cache; }
+
+function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } if (obj === null || typeof obj !== "object" && typeof obj !== "function") { return { default: obj }; } var cache = _getRequireWildcardCache(); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) { var desc = hasPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : null; if (desc && (desc.get || desc.set)) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } newObj.default = obj; if (cache) { cache.set(obj, newObj); } return newObj; }
+
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow
+ */
+function Component() {
+  const [count, setCount] = (0, _react.useState)(0);
+  const isDarkMode = useIsDarkMode();
+  (0, _react.useEffect)(() => {// ...
+  }, []);
+
+  const handleClick = () => setCount(count + 1);
+
+  return /*#__PURE__*/_react.default.createElement(_react.default.Fragment, null, /*#__PURE__*/_react.default.createElement("div", null, "Dark mode? ", isDarkMode), /*#__PURE__*/_react.default.createElement("div", null, "Count: ", count), /*#__PURE__*/_react.default.createElement("button", {
+    onClick: handleClick
+  }, "Update count"));
+}
+
+function useIsDarkMode() {
+  const [isDarkMode] = (0, _react.useState)(false);
+  (0, _react.useEffect)(function useEffectCreate() {// Here is where we may listen to a "theme" event...
+  }, []);
+  return isDarkMode;
+}
+//# sourceMappingURL=data:application/json;charset=utf-8;base64,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
\ No newline at end of file
diff --git a/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/inline/index-map/ComponentWithExternalCustomHooks.js b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/inline/index-map/ComponentWithExternalCustomHooks.js
new file mode 100644
index 0000000000000..2203d38c8009a
--- /dev/null
+++ b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/inline/index-map/ComponentWithExternalCustomHooks.js
@@ -0,0 +1,26 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.Component = Component;
+
+var _react = _interopRequireDefault(require("react"));
+
+var _useTheme = _interopRequireDefault(require("./useTheme"));
+
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
+
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow
+ */
+function Component() {
+  const theme = (0, _useTheme.default)();
+  return /*#__PURE__*/_react.default.createElement("div", null, "theme: ", theme);
+}
+//# sourceMappingURL=data:application/json;charset=utf-8;base64,eyJ2ZXJzaW9uIjozLCJzZWN0aW9ucyI6W3sib2Zmc2V0Ijp7ImxpbmUiOjAsImNvbHVtbiI6MH0sIm1hcCI6eyJ2ZXJzaW9uIjozLCJzb3VyY2VzIjpbIkNvbXBvbmVudFdpdGhFeHRlcm5hbEN1c3RvbUhvb2tzLmpzIl0sIm5hbWVzIjpbIkNvbXBvbmVudCIsInRoZW1lIl0sIm1hcHBpbmdzIjoiOzs7Ozs7O0FBU0E7O0FBQ0E7Ozs7QUFWQTs7Ozs7Ozs7QUFZTyxTQUFTQSxTQUFULEdBQXFCO0FBQzFCLFFBQU1DLEtBQUssR0FBRyx3QkFBZDtBQUVBLHNCQUFPLHFEQUFhQSxLQUFiLENBQVA7QUFDRCIsInNvdXJjZXNDb250ZW50IjpbIi8qKlxuICogQ29weXJpZ2h0IChjKSBGYWNlYm9vaywgSW5jLiBhbmQgaXRzIGFmZmlsaWF0ZXMuXG4gKlxuICogVGhpcyBzb3VyY2UgY29kZSBpcyBsaWNlbnNlZCB1bmRlciB0aGUgTUlUIGxpY2Vuc2UgZm91bmQgaW4gdGhlXG4gKiBMSUNFTlNFIGZpbGUgaW4gdGhlIHJvb3QgZGlyZWN0b3J5IG9mIHRoaXMgc291cmNlIHRyZWUuXG4gKlxuICogQGZsb3dcbiAqL1xuXG5pbXBvcnQgUmVhY3QgZnJvbSAncmVhY3QnO1xuaW1wb3J0IHVzZVRoZW1lIGZyb20gJy4vdXNlVGhlbWUnO1xuXG5leHBvcnQgZnVuY3Rpb24gQ29tcG9uZW50KCkge1xuICBjb25zdCB0aGVtZSA9IHVzZVRoZW1lKCk7XG5cbiAgcmV0dXJuIDxkaXY+dGhlbWU6IHt0aGVtZX08L2Rpdj47XG59XG4iXX19XX0=
\ No newline at end of file
diff --git a/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/inline/index-map/ComponentWithMultipleHooksPerLine.js b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/inline/index-map/ComponentWithMultipleHooksPerLine.js
new file mode 100644
index 0000000000000..622c40411ed67
--- /dev/null
+++ b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/inline/index-map/ComponentWithMultipleHooksPerLine.js
@@ -0,0 +1,30 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.Component = Component;
+
+var _react = require("react");
+
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow
+ */
+const A = /*#__PURE__*/(0, _react.createContext)(1);
+const B = /*#__PURE__*/(0, _react.createContext)(2);
+
+function Component() {
+  const a = (0, _react.useContext)(A);
+  const b = (0, _react.useContext)(B); // prettier-ignore
+
+  const c = (0, _react.useContext)(A),
+        d = (0, _react.useContext)(B); // eslint-disable-line one-var
+
+  return a + b + c + d;
+}
+//# sourceMappingURL=data:application/json;charset=utf-8;base64,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
\ No newline at end of file
diff --git a/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/inline/index-map/ComponentWithNestedHooks.js b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/inline/index-map/ComponentWithNestedHooks.js
new file mode 100644
index 0000000000000..ecb11d4a90948
--- /dev/null
+++ b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/inline/index-map/ComponentWithNestedHooks.js
@@ -0,0 +1,28 @@
+"use strict";
+
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow
+ */
+const {
+  useMemo,
+  useState
+} = require('react');
+
+function Component(props) {
+  const InnerComponent = useMemo(() => () => {
+    const [state] = useState(0);
+    return state;
+  });
+  props.callback(InnerComponent);
+  return null;
+}
+
+module.exports = {
+  Component
+};
+//# sourceMappingURL=data:application/json;charset=utf-8;base64,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
\ No newline at end of file
diff --git a/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/inline/index-map/ContainingStringSourceMappingURL.js b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/inline/index-map/ContainingStringSourceMappingURL.js
new file mode 100644
index 0000000000000..706ed20eea9c6
--- /dev/null
+++ b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/inline/index-map/ContainingStringSourceMappingURL.js
@@ -0,0 +1,29 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.Component = Component;
+
+var _react = _interopRequireWildcard(require("react"));
+
+function _getRequireWildcardCache() { if (typeof WeakMap !== "function") return null; var cache = new WeakMap(); _getRequireWildcardCache = function () { return cache; }; return cache; }
+
+function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } if (obj === null || typeof obj !== "object" && typeof obj !== "function") { return { default: obj }; } var cache = _getRequireWildcardCache(); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) { var desc = hasPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : null; if (desc && (desc.get || desc.set)) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } newObj.default = obj; if (cache) { cache.set(obj, newObj); } return newObj; }
+
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow
+ */
+// ?sourceMappingURL=([^\s'"]+)/gm
+function Component() {
+  const [count, setCount] = (0, _react.useState)(0);
+  return /*#__PURE__*/_react.default.createElement("div", null, /*#__PURE__*/_react.default.createElement("p", null, "You clicked ", count, " times"), /*#__PURE__*/_react.default.createElement("button", {
+    onClick: () => setCount(count + 1)
+  }, "Click me"));
+}
+//# sourceMappingURL=data:application/json;charset=utf-8;base64,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
\ No newline at end of file
diff --git a/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/inline/index-map/Example.js b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/inline/index-map/Example.js
new file mode 100644
index 0000000000000..4d1ee2e349d7d
--- /dev/null
+++ b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/inline/index-map/Example.js
@@ -0,0 +1,28 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.Component = Component;
+
+var _react = _interopRequireWildcard(require("react"));
+
+function _getRequireWildcardCache() { if (typeof WeakMap !== "function") return null; var cache = new WeakMap(); _getRequireWildcardCache = function () { return cache; }; return cache; }
+
+function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } if (obj === null || typeof obj !== "object" && typeof obj !== "function") { return { default: obj }; } var cache = _getRequireWildcardCache(); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) { var desc = hasPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : null; if (desc && (desc.get || desc.set)) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } newObj.default = obj; if (cache) { cache.set(obj, newObj); } return newObj; }
+
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow
+ */
+function Component() {
+  const [count, setCount] = (0, _react.useState)(0);
+  return /*#__PURE__*/_react.default.createElement("div", null, /*#__PURE__*/_react.default.createElement("p", null, "You clicked ", count, " times"), /*#__PURE__*/_react.default.createElement("button", {
+    onClick: () => setCount(count + 1)
+  }, "Click me"));
+}
+//# sourceMappingURL=data:application/json;charset=utf-8;base64,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
\ No newline at end of file
diff --git a/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/inline/index-map/InlineRequire.js b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/inline/index-map/InlineRequire.js
new file mode 100644
index 0000000000000..aadb2b3b5c9d5
--- /dev/null
+++ b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/inline/index-map/InlineRequire.js
@@ -0,0 +1,21 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.Component = Component;
+
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow
+ */
+function Component() {
+  const [count] = require('react').useState(0);
+
+  return count;
+}
+//# sourceMappingURL=data:application/json;charset=utf-8;base64,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
\ No newline at end of file
diff --git a/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/inline/index-map/ToDoList.js b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/inline/index-map/ToDoList.js
new file mode 100644
index 0000000000000..d509cfdb33ef9
--- /dev/null
+++ b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/inline/index-map/ToDoList.js
@@ -0,0 +1,106 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.ListItem = ListItem;
+exports.List = List;
+
+var React = _interopRequireWildcard(require("react"));
+
+function _getRequireWildcardCache() { if (typeof WeakMap !== "function") return null; var cache = new WeakMap(); _getRequireWildcardCache = function () { return cache; }; return cache; }
+
+function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } if (obj === null || typeof obj !== "object" && typeof obj !== "function") { return { default: obj }; } var cache = _getRequireWildcardCache(); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) { var desc = hasPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : null; if (desc && (desc.get || desc.set)) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } newObj.default = obj; if (cache) { cache.set(obj, newObj); } return newObj; }
+
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow
+ */
+function ListItem({
+  item,
+  removeItem,
+  toggleItem
+}) {
+  const handleDelete = (0, React.useCallback)(() => {
+    removeItem(item);
+  }, [item, removeItem]);
+  const handleToggle = (0, React.useCallback)(() => {
+    toggleItem(item);
+  }, [item, toggleItem]);
+  return /*#__PURE__*/React.createElement("li", null, /*#__PURE__*/React.createElement("button", {
+    onClick: handleDelete
+  }, "Delete"), /*#__PURE__*/React.createElement("label", null, /*#__PURE__*/React.createElement("input", {
+    checked: item.isComplete,
+    onChange: handleToggle,
+    type: "checkbox"
+  }), ' ', item.text));
+}
+
+function List(props) {
+  const [newItemText, setNewItemText] = (0, React.useState)('');
+  const [items, setItems] = (0, React.useState)([{
+    id: 1,
+    isComplete: true,
+    text: 'First'
+  }, {
+    id: 2,
+    isComplete: true,
+    text: 'Second'
+  }, {
+    id: 3,
+    isComplete: false,
+    text: 'Third'
+  }]);
+  const [uid, setUID] = (0, React.useState)(4);
+  const handleClick = (0, React.useCallback)(() => {
+    if (newItemText !== '') {
+      setItems([...items, {
+        id: uid,
+        isComplete: false,
+        text: newItemText
+      }]);
+      setUID(uid + 1);
+      setNewItemText('');
+    }
+  }, [newItemText, items, uid]);
+  const handleKeyPress = (0, React.useCallback)(event => {
+    if (event.key === 'Enter') {
+      handleClick();
+    }
+  }, [handleClick]);
+  const handleChange = (0, React.useCallback)(event => {
+    setNewItemText(event.currentTarget.value);
+  }, [setNewItemText]);
+  const removeItem = (0, React.useCallback)(itemToRemove => setItems(items.filter(item => item !== itemToRemove)), [items]);
+  const toggleItem = (0, React.useCallback)(itemToToggle => {
+    // Dont use indexOf()
+    // because editing props in DevTools creates a new Object.
+    const index = items.findIndex(item => item.id === itemToToggle.id);
+    setItems(items.slice(0, index).concat({ ...itemToToggle,
+      isComplete: !itemToToggle.isComplete
+    }).concat(items.slice(index + 1)));
+  }, [items]);
+  return /*#__PURE__*/React.createElement(React.Fragment, null, /*#__PURE__*/React.createElement("h1", null, "List"), /*#__PURE__*/React.createElement("input", {
+    type: "text",
+    placeholder: "New list item...",
+    value: newItemText,
+    onChange: handleChange,
+    onKeyPress: handleKeyPress
+  }), /*#__PURE__*/React.createElement("button", {
+    disabled: newItemText === '',
+    onClick: handleClick
+  }, /*#__PURE__*/React.createElement("span", {
+    role: "img",
+    "aria-label": "Add item"
+  }, "Add")), /*#__PURE__*/React.createElement("ul", null, items.map(item => /*#__PURE__*/React.createElement(ListItem, {
+    key: item.id,
+    item: item,
+    removeItem: removeItem,
+    toggleItem: toggleItem
+  }))));
+}
+//# sourceMappingURL=data:application/json;charset=utf-8;base64,{"version":3,"sections":[{"offset":{"line":0,"column":0},"map":{"version":3,"sources":["ToDoList.js"],"names":["ListItem","item","removeItem","toggleItem","handleDelete","handleToggle","isComplete","text","List","props","newItemText","setNewItemText","items","setItems","id","uid","setUID","handleClick","handleKeyPress","event","key","handleChange","currentTarget","value","itemToRemove","filter","itemToToggle","index","findIndex","slice","concat","map"],"mappings":";;;;;;;;AASA;;;;;;AATA;;;;;;;;AAYO,SAASA,QAAT,CAAkB;AAACC,EAAAA,IAAD;AAAOC,EAAAA,UAAP;AAAmBC,EAAAA;AAAnB,CAAlB,EAAkD;AACvD,QAAMC,YAAY,GAAG,uBAAY,MAAM;AACrCF,IAAAA,UAAU,CAACD,IAAD,CAAV;AACD,GAFoB,EAElB,CAACA,IAAD,EAAOC,UAAP,CAFkB,CAArB;AAIA,QAAMG,YAAY,GAAG,uBAAY,MAAM;AACrCF,IAAAA,UAAU,CAACF,IAAD,CAAV;AACD,GAFoB,EAElB,CAACA,IAAD,EAAOE,UAAP,CAFkB,CAArB;AAIA,sBACE,6CACE;AAAQ,IAAA,OAAO,EAAEC;AAAjB,cADF,eAEE,gDACE;AACE,IAAA,OAAO,EAAEH,IAAI,CAACK,UADhB;AAEE,IAAA,QAAQ,EAAED,YAFZ;AAGE,IAAA,IAAI,EAAC;AAHP,IADF,EAKK,GALL,EAMGJ,IAAI,CAACM,IANR,CAFF,CADF;AAaD;;AAEM,SAASC,IAAT,CAAcC,KAAd,EAAqB;AAC1B,QAAM,CAACC,WAAD,EAAcC,cAAd,IAAgC,oBAAS,EAAT,CAAtC;AACA,QAAM,CAACC,KAAD,EAAQC,QAAR,IAAoB,oBAAS,CACjC;AAACC,IAAAA,EAAE,EAAE,CAAL;AAAQR,IAAAA,UAAU,EAAE,IAApB;AAA0BC,IAAAA,IAAI,EAAE;AAAhC,GADiC,EAEjC;AAACO,IAAAA,EAAE,EAAE,CAAL;AAAQR,IAAAA,UAAU,EAAE,IAApB;AAA0BC,IAAAA,IAAI,EAAE;AAAhC,GAFiC,EAGjC;AAACO,IAAAA,EAAE,EAAE,CAAL;AAAQR,IAAAA,UAAU,EAAE,KAApB;AAA2BC,IAAAA,IAAI,EAAE;AAAjC,GAHiC,CAAT,CAA1B;AAKA,QAAM,CAACQ,GAAD,EAAMC,MAAN,IAAgB,oBAAS,CAAT,CAAtB;AAEA,QAAMC,WAAW,GAAG,uBAAY,MAAM;AACpC,QAAIP,WAAW,KAAK,EAApB,EAAwB;AACtBG,MAAAA,QAAQ,CAAC,CACP,GAAGD,KADI,EAEP;AACEE,QAAAA,EAAE,EAAEC,GADN;AAEET,QAAAA,UAAU,EAAE,KAFd;AAGEC,QAAAA,IAAI,EAAEG;AAHR,OAFO,CAAD,CAAR;AAQAM,MAAAA,MAAM,CAACD,GAAG,GAAG,CAAP,CAAN;AACAJ,MAAAA,cAAc,CAAC,EAAD,CAAd;AACD;AACF,GAbmB,EAajB,CAACD,WAAD,EAAcE,KAAd,EAAqBG,GAArB,CAbiB,CAApB;AAeA,QAAMG,cAAc,GAAG,uBACrBC,KAAK,IAAI;AACP,QAAIA,KAAK,CAACC,GAAN,KAAc,OAAlB,EAA2B;AACzBH,MAAAA,WAAW;AACZ;AACF,GALoB,EAMrB,CAACA,WAAD,CANqB,CAAvB;AASA,QAAMI,YAAY,GAAG,uBACnBF,KAAK,IAAI;AACPR,IAAAA,cAAc,CAACQ,KAAK,CAACG,aAAN,CAAoBC,KAArB,CAAd;AACD,GAHkB,EAInB,CAACZ,cAAD,CAJmB,CAArB;AAOA,QAAMT,UAAU,GAAG,uBACjBsB,YAAY,IAAIX,QAAQ,CAACD,KAAK,CAACa,MAAN,CAAaxB,IAAI,IAAIA,IAAI,KAAKuB,YAA9B,CAAD,CADP,EAEjB,CAACZ,KAAD,CAFiB,CAAnB;AAKA,QAAMT,UAAU,GAAG,uBACjBuB,YAAY,IAAI;AACd;AACA;AACA,UAAMC,KAAK,GAAGf,KAAK,CAACgB,SAAN,CAAgB3B,IAAI,IAAIA,IAAI,CAACa,EAAL,KAAYY,YAAY,CAACZ,EAAjD,CAAd;AAEAD,IAAAA,QAAQ,CACND,KAAK,CACFiB,KADH,CACS,CADT,EACYF,KADZ,EAEGG,MAFH,CAEU,EACN,GAAGJ,YADG;AAENpB,MAAAA,UAAU,EAAE,CAACoB,YAAY,CAACpB;AAFpB,KAFV,EAMGwB,MANH,CAMUlB,KAAK,CAACiB,KAAN,CAAYF,KAAK,GAAG,CAApB,CANV,CADM,CAAR;AASD,GAfgB,EAgBjB,CAACf,KAAD,CAhBiB,CAAnB;AAmBA,sBACE,oBAAC,cAAD,qBACE,uCADF,eAEE;AACE,IAAA,IAAI,EAAC,MADP;AAEE,IAAA,WAAW,EAAC,kBAFd;AAGE,IAAA,KAAK,EAAEF,WAHT;AAIE,IAAA,QAAQ,EAAEW,YAJZ;AAKE,IAAA,UAAU,EAAEH;AALd,IAFF,eASE;AAAQ,IAAA,QAAQ,EAAER,WAAW,KAAK,EAAlC;AAAsC,IAAA,OAAO,EAAEO;AAA/C,kBACE;AAAM,IAAA,IAAI,EAAC,KAAX;AAAiB,kBAAW;AAA5B,WADF,CATF,eAcE,gCACGL,KAAK,CAACmB,GAAN,CAAU9B,IAAI,iBACb,oBAAC,QAAD;AACE,IAAA,GAAG,EAAEA,IAAI,CAACa,EADZ;AAEE,IAAA,IAAI,EAAEb,IAFR;AAGE,IAAA,UAAU,EAAEC,UAHd;AAIE,IAAA,UAAU,EAAEC;AAJd,IADD,CADH,CAdF,CADF;AA2BD","sourcesContent":["/**\n * Copyright (c) Facebook, Inc. and its affiliates.\n *\n * This source code is licensed under the MIT license found in the\n * LICENSE file in the root directory of this source tree.\n *\n * @flow\n */\n\nimport * as React from 'react';\nimport {Fragment, useCallback, useState} from 'react';\n\nexport function ListItem({item, removeItem, toggleItem}) {\n  const handleDelete = useCallback(() => {\n    removeItem(item);\n  }, [item, removeItem]);\n\n  const handleToggle = useCallback(() => {\n    toggleItem(item);\n  }, [item, toggleItem]);\n\n  return (\n    <li>\n      <button onClick={handleDelete}>Delete</button>\n      <label>\n        <input\n          checked={item.isComplete}\n          onChange={handleToggle}\n          type=\"checkbox\"\n        />{' '}\n        {item.text}\n      </label>\n    </li>\n  );\n}\n\nexport function List(props) {\n  const [newItemText, setNewItemText] = useState('');\n  const [items, setItems] = useState([\n    {id: 1, isComplete: true, text: 'First'},\n    {id: 2, isComplete: true, text: 'Second'},\n    {id: 3, isComplete: false, text: 'Third'},\n  ]);\n  const [uid, setUID] = useState(4);\n\n  const handleClick = useCallback(() => {\n    if (newItemText !== '') {\n      setItems([\n        ...items,\n        {\n          id: uid,\n          isComplete: false,\n          text: newItemText,\n        },\n      ]);\n      setUID(uid + 1);\n      setNewItemText('');\n    }\n  }, [newItemText, items, uid]);\n\n  const handleKeyPress = useCallback(\n    event => {\n      if (event.key === 'Enter') {\n        handleClick();\n      }\n    },\n    [handleClick],\n  );\n\n  const handleChange = useCallback(\n    event => {\n      setNewItemText(event.currentTarget.value);\n    },\n    [setNewItemText],\n  );\n\n  const removeItem = useCallback(\n    itemToRemove => setItems(items.filter(item => item !== itemToRemove)),\n    [items],\n  );\n\n  const toggleItem = useCallback(\n    itemToToggle => {\n      // Dont use indexOf()\n      // because editing props in DevTools creates a new Object.\n      const index = items.findIndex(item => item.id === itemToToggle.id);\n\n      setItems(\n        items\n          .slice(0, index)\n          .concat({\n            ...itemToToggle,\n            isComplete: !itemToToggle.isComplete,\n          })\n          .concat(items.slice(index + 1)),\n      );\n    },\n    [items],\n  );\n\n  return (\n    <Fragment>\n      <h1>List</h1>\n      <input\n        type=\"text\"\n        placeholder=\"New list item...\"\n        value={newItemText}\n        onChange={handleChange}\n        onKeyPress={handleKeyPress}\n      />\n      <button disabled={newItemText === ''} onClick={handleClick}>\n        <span role=\"img\" aria-label=\"Add item\">\n          Add\n        </span>\n      </button>\n      <ul>\n        {items.map(item => (\n          <ListItem\n            key={item.id}\n            item={item}\n            removeItem={removeItem}\n            toggleItem={toggleItem}\n          />\n        ))}\n      </ul>\n    </Fragment>\n  );\n}\n"]}}]}
\ No newline at end of file
diff --git a/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/inline/index-map/index.js b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/inline/index-map/index.js
new file mode 100644
index 0000000000000..4f1023a79fd6e
--- /dev/null
+++ b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/inline/index-map/index.js
@@ -0,0 +1,89 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+Object.defineProperty(exports, "ComponentUsingHooksIndirectly", {
+  enumerable: true,
+  get: function () {
+    return _ComponentUsingHooksIndirectly.Component;
+  }
+});
+Object.defineProperty(exports, "ComponentWithCustomHook", {
+  enumerable: true,
+  get: function () {
+    return _ComponentWithCustomHook.Component;
+  }
+});
+Object.defineProperty(exports, "ComponentWithExternalCustomHooks", {
+  enumerable: true,
+  get: function () {
+    return _ComponentWithExternalCustomHooks.Component;
+  }
+});
+Object.defineProperty(exports, "ComponentWithMultipleHooksPerLine", {
+  enumerable: true,
+  get: function () {
+    return _ComponentWithMultipleHooksPerLine.Component;
+  }
+});
+Object.defineProperty(exports, "ComponentWithNestedHooks", {
+  enumerable: true,
+  get: function () {
+    return _ComponentWithNestedHooks.Component;
+  }
+});
+Object.defineProperty(exports, "ContainingStringSourceMappingURL", {
+  enumerable: true,
+  get: function () {
+    return _ContainingStringSourceMappingURL.Component;
+  }
+});
+Object.defineProperty(exports, "Example", {
+  enumerable: true,
+  get: function () {
+    return _Example.Component;
+  }
+});
+Object.defineProperty(exports, "InlineRequire", {
+  enumerable: true,
+  get: function () {
+    return _InlineRequire.Component;
+  }
+});
+Object.defineProperty(exports, "useTheme", {
+  enumerable: true,
+  get: function () {
+    return _useTheme.default;
+  }
+});
+exports.ToDoList = void 0;
+
+var _ComponentUsingHooksIndirectly = require("./ComponentUsingHooksIndirectly");
+
+var _ComponentWithCustomHook = require("./ComponentWithCustomHook");
+
+var _ComponentWithExternalCustomHooks = require("./ComponentWithExternalCustomHooks");
+
+var _ComponentWithMultipleHooksPerLine = require("./ComponentWithMultipleHooksPerLine");
+
+var _ComponentWithNestedHooks = require("./ComponentWithNestedHooks");
+
+var _ContainingStringSourceMappingURL = require("./ContainingStringSourceMappingURL");
+
+var _Example = require("./Example");
+
+var _InlineRequire = require("./InlineRequire");
+
+var ToDoList = _interopRequireWildcard(require("./ToDoList"));
+
+exports.ToDoList = ToDoList;
+
+var _useTheme = _interopRequireDefault(require("./useTheme"));
+
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
+
+function _getRequireWildcardCache() { if (typeof WeakMap !== "function") return null; var cache = new WeakMap(); _getRequireWildcardCache = function () { return cache; }; return cache; }
+
+function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } if (obj === null || typeof obj !== "object" && typeof obj !== "function") { return { default: obj }; } var cache = _getRequireWildcardCache(); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) { var desc = hasPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : null; if (desc && (desc.get || desc.set)) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } newObj.default = obj; if (cache) { cache.set(obj, newObj); } return newObj; }
+//# sourceMappingURL=data:application/json;charset=utf-8;base64,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
\ No newline at end of file
diff --git a/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/inline/index-map/useTheme.js b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/inline/index-map/useTheme.js
new file mode 100644
index 0000000000000..e4c71f07ae717
--- /dev/null
+++ b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/inline/index-map/useTheme.js
@@ -0,0 +1,27 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = useTheme;
+exports.ThemeContext = void 0;
+
+var _react = require("react");
+
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow
+ */
+const ThemeContext = /*#__PURE__*/(0, _react.createContext)('bright');
+exports.ThemeContext = ThemeContext;
+
+function useTheme() {
+  const theme = (0, _react.useContext)(ThemeContext);
+  (0, _react.useDebugValue)(theme);
+  return theme;
+}
+//# sourceMappingURL=data:application/json;charset=utf-8;base64,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
\ No newline at end of file
diff --git a/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/inline/react-sources-extended/index-map/ComponentUsingHooksIndirectly.js b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/inline/react-sources-extended/index-map/ComponentUsingHooksIndirectly.js
new file mode 100644
index 0000000000000..e873b766dc3dd
--- /dev/null
+++ b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/inline/react-sources-extended/index-map/ComponentUsingHooksIndirectly.js
@@ -0,0 +1,45 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.Component = Component;
+
+var _react = _interopRequireWildcard(require("react"));
+
+function _getRequireWildcardCache() { if (typeof WeakMap !== "function") return null; var cache = new WeakMap(); _getRequireWildcardCache = function () { return cache; }; return cache; }
+
+function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } if (obj === null || typeof obj !== "object" && typeof obj !== "function") { return { default: obj }; } var cache = _getRequireWildcardCache(); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) { var desc = hasPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : null; if (desc && (desc.get || desc.set)) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } newObj.default = obj; if (cache) { cache.set(obj, newObj); } return newObj; }
+
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow
+ */
+function Component() {
+  const countState = (0, _react.useState)(0);
+  const count = countState[0];
+  const setCount = countState[1];
+  const darkMode = useIsDarkMode();
+  const [isDarkMode] = darkMode;
+  (0, _react.useEffect)(() => {// ...
+  }, []);
+
+  const handleClick = () => setCount(count + 1);
+
+  return /*#__PURE__*/_react.default.createElement(_react.default.Fragment, null, /*#__PURE__*/_react.default.createElement("div", null, "Dark mode? ", isDarkMode), /*#__PURE__*/_react.default.createElement("div", null, "Count: ", count), /*#__PURE__*/_react.default.createElement("button", {
+    onClick: handleClick
+  }, "Update count"));
+}
+
+function useIsDarkMode() {
+  const darkModeState = (0, _react.useState)(false);
+  const [isDarkMode] = darkModeState;
+  (0, _react.useEffect)(function useEffectCreate() {// Here is where we may listen to a "theme" event...
+  }, []);
+  return [isDarkMode, () => {}];
+}
+//# sourceMappingURL=data:application/json;charset=utf-8;base64,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
\ No newline at end of file
diff --git a/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/inline/react-sources-extended/index-map/ComponentWithCustomHook.js b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/inline/react-sources-extended/index-map/ComponentWithCustomHook.js
new file mode 100644
index 0000000000000..f930dc472bd87
--- /dev/null
+++ b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/inline/react-sources-extended/index-map/ComponentWithCustomHook.js
@@ -0,0 +1,41 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.Component = Component;
+
+var _react = _interopRequireWildcard(require("react"));
+
+function _getRequireWildcardCache() { if (typeof WeakMap !== "function") return null; var cache = new WeakMap(); _getRequireWildcardCache = function () { return cache; }; return cache; }
+
+function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } if (obj === null || typeof obj !== "object" && typeof obj !== "function") { return { default: obj }; } var cache = _getRequireWildcardCache(); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) { var desc = hasPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : null; if (desc && (desc.get || desc.set)) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } newObj.default = obj; if (cache) { cache.set(obj, newObj); } return newObj; }
+
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow
+ */
+function Component() {
+  const [count, setCount] = (0, _react.useState)(0);
+  const isDarkMode = useIsDarkMode();
+  (0, _react.useEffect)(() => {// ...
+  }, []);
+
+  const handleClick = () => setCount(count + 1);
+
+  return /*#__PURE__*/_react.default.createElement(_react.default.Fragment, null, /*#__PURE__*/_react.default.createElement("div", null, "Dark mode? ", isDarkMode), /*#__PURE__*/_react.default.createElement("div", null, "Count: ", count), /*#__PURE__*/_react.default.createElement("button", {
+    onClick: handleClick
+  }, "Update count"));
+}
+
+function useIsDarkMode() {
+  const [isDarkMode] = (0, _react.useState)(false);
+  (0, _react.useEffect)(function useEffectCreate() {// Here is where we may listen to a "theme" event...
+  }, []);
+  return isDarkMode;
+}
+//# sourceMappingURL=data:application/json;charset=utf-8;base64,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
\ No newline at end of file
diff --git a/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/inline/react-sources-extended/index-map/ComponentWithExternalCustomHooks.js b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/inline/react-sources-extended/index-map/ComponentWithExternalCustomHooks.js
new file mode 100644
index 0000000000000..3a70b896352c7
--- /dev/null
+++ b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/inline/react-sources-extended/index-map/ComponentWithExternalCustomHooks.js
@@ -0,0 +1,26 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.Component = Component;
+
+var _react = _interopRequireDefault(require("react"));
+
+var _useTheme = _interopRequireDefault(require("./useTheme"));
+
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
+
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow
+ */
+function Component() {
+  const theme = (0, _useTheme.default)();
+  return /*#__PURE__*/_react.default.createElement("div", null, "theme: ", theme);
+}
+//# sourceMappingURL=data:application/json;charset=utf-8;base64,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
\ No newline at end of file
diff --git a/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/inline/react-sources-extended/index-map/ComponentWithMultipleHooksPerLine.js b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/inline/react-sources-extended/index-map/ComponentWithMultipleHooksPerLine.js
new file mode 100644
index 0000000000000..b9e998a35baf5
--- /dev/null
+++ b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/inline/react-sources-extended/index-map/ComponentWithMultipleHooksPerLine.js
@@ -0,0 +1,30 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.Component = Component;
+
+var _react = require("react");
+
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow
+ */
+const A = /*#__PURE__*/(0, _react.createContext)(1);
+const B = /*#__PURE__*/(0, _react.createContext)(2);
+
+function Component() {
+  const a = (0, _react.useContext)(A);
+  const b = (0, _react.useContext)(B); // prettier-ignore
+
+  const c = (0, _react.useContext)(A),
+        d = (0, _react.useContext)(B); // eslint-disable-line one-var
+
+  return a + b + c + d;
+}
+//# sourceMappingURL=data:application/json;charset=utf-8;base64,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
\ No newline at end of file
diff --git a/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/inline/react-sources-extended/index-map/ComponentWithNestedHooks.js b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/inline/react-sources-extended/index-map/ComponentWithNestedHooks.js
new file mode 100644
index 0000000000000..cde7af4fe5ab6
--- /dev/null
+++ b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/inline/react-sources-extended/index-map/ComponentWithNestedHooks.js
@@ -0,0 +1,28 @@
+"use strict";
+
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow
+ */
+const {
+  useMemo,
+  useState
+} = require('react');
+
+function Component(props) {
+  const InnerComponent = useMemo(() => () => {
+    const [state] = useState(0);
+    return state;
+  });
+  props.callback(InnerComponent);
+  return null;
+}
+
+module.exports = {
+  Component
+};
+//# sourceMappingURL=data:application/json;charset=utf-8;base64,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
\ No newline at end of file
diff --git a/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/inline/react-sources-extended/index-map/ContainingStringSourceMappingURL.js b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/inline/react-sources-extended/index-map/ContainingStringSourceMappingURL.js
new file mode 100644
index 0000000000000..fe2aacab6f5a1
--- /dev/null
+++ b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/inline/react-sources-extended/index-map/ContainingStringSourceMappingURL.js
@@ -0,0 +1,29 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.Component = Component;
+
+var _react = _interopRequireWildcard(require("react"));
+
+function _getRequireWildcardCache() { if (typeof WeakMap !== "function") return null; var cache = new WeakMap(); _getRequireWildcardCache = function () { return cache; }; return cache; }
+
+function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } if (obj === null || typeof obj !== "object" && typeof obj !== "function") { return { default: obj }; } var cache = _getRequireWildcardCache(); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) { var desc = hasPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : null; if (desc && (desc.get || desc.set)) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } newObj.default = obj; if (cache) { cache.set(obj, newObj); } return newObj; }
+
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow
+ */
+// ?sourceMappingURL=([^\s'"]+)/gm
+function Component() {
+  const [count, setCount] = (0, _react.useState)(0);
+  return /*#__PURE__*/_react.default.createElement("div", null, /*#__PURE__*/_react.default.createElement("p", null, "You clicked ", count, " times"), /*#__PURE__*/_react.default.createElement("button", {
+    onClick: () => setCount(count + 1)
+  }, "Click me"));
+}
+//# sourceMappingURL=data:application/json;charset=utf-8;base64,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
\ No newline at end of file
diff --git a/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/inline/react-sources-extended/index-map/Example.js b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/inline/react-sources-extended/index-map/Example.js
new file mode 100644
index 0000000000000..f0aad76c791b9
--- /dev/null
+++ b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/inline/react-sources-extended/index-map/Example.js
@@ -0,0 +1,28 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.Component = Component;
+
+var _react = _interopRequireWildcard(require("react"));
+
+function _getRequireWildcardCache() { if (typeof WeakMap !== "function") return null; var cache = new WeakMap(); _getRequireWildcardCache = function () { return cache; }; return cache; }
+
+function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } if (obj === null || typeof obj !== "object" && typeof obj !== "function") { return { default: obj }; } var cache = _getRequireWildcardCache(); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) { var desc = hasPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : null; if (desc && (desc.get || desc.set)) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } newObj.default = obj; if (cache) { cache.set(obj, newObj); } return newObj; }
+
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow
+ */
+function Component() {
+  const [count, setCount] = (0, _react.useState)(0);
+  return /*#__PURE__*/_react.default.createElement("div", null, /*#__PURE__*/_react.default.createElement("p", null, "You clicked ", count, " times"), /*#__PURE__*/_react.default.createElement("button", {
+    onClick: () => setCount(count + 1)
+  }, "Click me"));
+}
+//# sourceMappingURL=data:application/json;charset=utf-8;base64,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
\ No newline at end of file
diff --git a/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/inline/react-sources-extended/index-map/InlineRequire.js b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/inline/react-sources-extended/index-map/InlineRequire.js
new file mode 100644
index 0000000000000..d78461f7c35f1
--- /dev/null
+++ b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/inline/react-sources-extended/index-map/InlineRequire.js
@@ -0,0 +1,21 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.Component = Component;
+
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow
+ */
+function Component() {
+  const [count] = require('react').useState(0);
+
+  return count;
+}
+//# sourceMappingURL=data:application/json;charset=utf-8;base64,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
\ No newline at end of file
diff --git a/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/inline/react-sources-extended/index-map/ToDoList.js b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/inline/react-sources-extended/index-map/ToDoList.js
new file mode 100644
index 0000000000000..f76552e16149f
--- /dev/null
+++ b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/inline/react-sources-extended/index-map/ToDoList.js
@@ -0,0 +1,106 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.ListItem = ListItem;
+exports.List = List;
+
+var React = _interopRequireWildcard(require("react"));
+
+function _getRequireWildcardCache() { if (typeof WeakMap !== "function") return null; var cache = new WeakMap(); _getRequireWildcardCache = function () { return cache; }; return cache; }
+
+function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } if (obj === null || typeof obj !== "object" && typeof obj !== "function") { return { default: obj }; } var cache = _getRequireWildcardCache(); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) { var desc = hasPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : null; if (desc && (desc.get || desc.set)) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } newObj.default = obj; if (cache) { cache.set(obj, newObj); } return newObj; }
+
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow
+ */
+function ListItem({
+  item,
+  removeItem,
+  toggleItem
+}) {
+  const handleDelete = (0, React.useCallback)(() => {
+    removeItem(item);
+  }, [item, removeItem]);
+  const handleToggle = (0, React.useCallback)(() => {
+    toggleItem(item);
+  }, [item, toggleItem]);
+  return /*#__PURE__*/React.createElement("li", null, /*#__PURE__*/React.createElement("button", {
+    onClick: handleDelete
+  }, "Delete"), /*#__PURE__*/React.createElement("label", null, /*#__PURE__*/React.createElement("input", {
+    checked: item.isComplete,
+    onChange: handleToggle,
+    type: "checkbox"
+  }), ' ', item.text));
+}
+
+function List(props) {
+  const [newItemText, setNewItemText] = (0, React.useState)('');
+  const [items, setItems] = (0, React.useState)([{
+    id: 1,
+    isComplete: true,
+    text: 'First'
+  }, {
+    id: 2,
+    isComplete: true,
+    text: 'Second'
+  }, {
+    id: 3,
+    isComplete: false,
+    text: 'Third'
+  }]);
+  const [uid, setUID] = (0, React.useState)(4);
+  const handleClick = (0, React.useCallback)(() => {
+    if (newItemText !== '') {
+      setItems([...items, {
+        id: uid,
+        isComplete: false,
+        text: newItemText
+      }]);
+      setUID(uid + 1);
+      setNewItemText('');
+    }
+  }, [newItemText, items, uid]);
+  const handleKeyPress = (0, React.useCallback)(event => {
+    if (event.key === 'Enter') {
+      handleClick();
+    }
+  }, [handleClick]);
+  const handleChange = (0, React.useCallback)(event => {
+    setNewItemText(event.currentTarget.value);
+  }, [setNewItemText]);
+  const removeItem = (0, React.useCallback)(itemToRemove => setItems(items.filter(item => item !== itemToRemove)), [items]);
+  const toggleItem = (0, React.useCallback)(itemToToggle => {
+    // Dont use indexOf()
+    // because editing props in DevTools creates a new Object.
+    const index = items.findIndex(item => item.id === itemToToggle.id);
+    setItems(items.slice(0, index).concat({ ...itemToToggle,
+      isComplete: !itemToToggle.isComplete
+    }).concat(items.slice(index + 1)));
+  }, [items]);
+  return /*#__PURE__*/React.createElement(React.Fragment, null, /*#__PURE__*/React.createElement("h1", null, "List"), /*#__PURE__*/React.createElement("input", {
+    type: "text",
+    placeholder: "New list item...",
+    value: newItemText,
+    onChange: handleChange,
+    onKeyPress: handleKeyPress
+  }), /*#__PURE__*/React.createElement("button", {
+    disabled: newItemText === '',
+    onClick: handleClick
+  }, /*#__PURE__*/React.createElement("span", {
+    role: "img",
+    "aria-label": "Add item"
+  }, "Add")), /*#__PURE__*/React.createElement("ul", null, items.map(item => /*#__PURE__*/React.createElement(ListItem, {
+    key: item.id,
+    item: item,
+    removeItem: removeItem,
+    toggleItem: toggleItem
+  }))));
+}
+//# sourceMappingURL=data:application/json;charset=utf-8;base64,{"version":3,"sections":[{"offset":{"line":0,"column":0},"map":{"version":3,"sources":["ToDoList.js"],"names":["ListItem","item","removeItem","toggleItem","handleDelete","handleToggle","isComplete","text","List","props","newItemText","setNewItemText","items","setItems","id","uid","setUID","handleClick","handleKeyPress","event","key","handleChange","currentTarget","value","itemToRemove","filter","itemToToggle","index","findIndex","slice","concat","map"],"mappings":";;;;;;;;AASA;;;;;;AATA;;;;;;;;AAYO,SAASA,QAAT,CAAkB;AAACC,EAAAA,IAAD;AAAOC,EAAAA,UAAP;AAAmBC,EAAAA;AAAnB,CAAlB,EAAkD;AACvD,QAAMC,YAAY,GAAG,uBAAY,MAAM;AACrCF,IAAAA,UAAU,CAACD,IAAD,CAAV;AACD,GAFoB,EAElB,CAACA,IAAD,EAAOC,UAAP,CAFkB,CAArB;AAIA,QAAMG,YAAY,GAAG,uBAAY,MAAM;AACrCF,IAAAA,UAAU,CAACF,IAAD,CAAV;AACD,GAFoB,EAElB,CAACA,IAAD,EAAOE,UAAP,CAFkB,CAArB;AAIA,sBACE,6CACE;AAAQ,IAAA,OAAO,EAAEC;AAAjB,cADF,eAEE,gDACE;AACE,IAAA,OAAO,EAAEH,IAAI,CAACK,UADhB;AAEE,IAAA,QAAQ,EAAED,YAFZ;AAGE,IAAA,IAAI,EAAC;AAHP,IADF,EAKK,GALL,EAMGJ,IAAI,CAACM,IANR,CAFF,CADF;AAaD;;AAEM,SAASC,IAAT,CAAcC,KAAd,EAAqB;AAC1B,QAAM,CAACC,WAAD,EAAcC,cAAd,IAAgC,oBAAS,EAAT,CAAtC;AACA,QAAM,CAACC,KAAD,EAAQC,QAAR,IAAoB,oBAAS,CACjC;AAACC,IAAAA,EAAE,EAAE,CAAL;AAAQR,IAAAA,UAAU,EAAE,IAApB;AAA0BC,IAAAA,IAAI,EAAE;AAAhC,GADiC,EAEjC;AAACO,IAAAA,EAAE,EAAE,CAAL;AAAQR,IAAAA,UAAU,EAAE,IAApB;AAA0BC,IAAAA,IAAI,EAAE;AAAhC,GAFiC,EAGjC;AAACO,IAAAA,EAAE,EAAE,CAAL;AAAQR,IAAAA,UAAU,EAAE,KAApB;AAA2BC,IAAAA,IAAI,EAAE;AAAjC,GAHiC,CAAT,CAA1B;AAKA,QAAM,CAACQ,GAAD,EAAMC,MAAN,IAAgB,oBAAS,CAAT,CAAtB;AAEA,QAAMC,WAAW,GAAG,uBAAY,MAAM;AACpC,QAAIP,WAAW,KAAK,EAApB,EAAwB;AACtBG,MAAAA,QAAQ,CAAC,CACP,GAAGD,KADI,EAEP;AACEE,QAAAA,EAAE,EAAEC,GADN;AAEET,QAAAA,UAAU,EAAE,KAFd;AAGEC,QAAAA,IAAI,EAAEG;AAHR,OAFO,CAAD,CAAR;AAQAM,MAAAA,MAAM,CAACD,GAAG,GAAG,CAAP,CAAN;AACAJ,MAAAA,cAAc,CAAC,EAAD,CAAd;AACD;AACF,GAbmB,EAajB,CAACD,WAAD,EAAcE,KAAd,EAAqBG,GAArB,CAbiB,CAApB;AAeA,QAAMG,cAAc,GAAG,uBACrBC,KAAK,IAAI;AACP,QAAIA,KAAK,CAACC,GAAN,KAAc,OAAlB,EAA2B;AACzBH,MAAAA,WAAW;AACZ;AACF,GALoB,EAMrB,CAACA,WAAD,CANqB,CAAvB;AASA,QAAMI,YAAY,GAAG,uBACnBF,KAAK,IAAI;AACPR,IAAAA,cAAc,CAACQ,KAAK,CAACG,aAAN,CAAoBC,KAArB,CAAd;AACD,GAHkB,EAInB,CAACZ,cAAD,CAJmB,CAArB;AAOA,QAAMT,UAAU,GAAG,uBACjBsB,YAAY,IAAIX,QAAQ,CAACD,KAAK,CAACa,MAAN,CAAaxB,IAAI,IAAIA,IAAI,KAAKuB,YAA9B,CAAD,CADP,EAEjB,CAACZ,KAAD,CAFiB,CAAnB;AAKA,QAAMT,UAAU,GAAG,uBACjBuB,YAAY,IAAI;AACd;AACA;AACA,UAAMC,KAAK,GAAGf,KAAK,CAACgB,SAAN,CAAgB3B,IAAI,IAAIA,IAAI,CAACa,EAAL,KAAYY,YAAY,CAACZ,EAAjD,CAAd;AAEAD,IAAAA,QAAQ,CACND,KAAK,CACFiB,KADH,CACS,CADT,EACYF,KADZ,EAEGG,MAFH,CAEU,EACN,GAAGJ,YADG;AAENpB,MAAAA,UAAU,EAAE,CAACoB,YAAY,CAACpB;AAFpB,KAFV,EAMGwB,MANH,CAMUlB,KAAK,CAACiB,KAAN,CAAYF,KAAK,GAAG,CAApB,CANV,CADM,CAAR;AASD,GAfgB,EAgBjB,CAACf,KAAD,CAhBiB,CAAnB;AAmBA,sBACE,oBAAC,cAAD,qBACE,uCADF,eAEE;AACE,IAAA,IAAI,EAAC,MADP;AAEE,IAAA,WAAW,EAAC,kBAFd;AAGE,IAAA,KAAK,EAAEF,WAHT;AAIE,IAAA,QAAQ,EAAEW,YAJZ;AAKE,IAAA,UAAU,EAAEH;AALd,IAFF,eASE;AAAQ,IAAA,QAAQ,EAAER,WAAW,KAAK,EAAlC;AAAsC,IAAA,OAAO,EAAEO;AAA/C,kBACE;AAAM,IAAA,IAAI,EAAC,KAAX;AAAiB,kBAAW;AAA5B,WADF,CATF,eAcE,gCACGL,KAAK,CAACmB,GAAN,CAAU9B,IAAI,iBACb,oBAAC,QAAD;AACE,IAAA,GAAG,EAAEA,IAAI,CAACa,EADZ;AAEE,IAAA,IAAI,EAAEb,IAFR;AAGE,IAAA,UAAU,EAAEC,UAHd;AAIE,IAAA,UAAU,EAAEC;AAJd,IADD,CADH,CAdF,CADF;AA2BD","sourcesContent":["/**\n * Copyright (c) Facebook, Inc. and its affiliates.\n *\n * This source code is licensed under the MIT license found in the\n * LICENSE file in the root directory of this source tree.\n *\n * @flow\n */\n\nimport * as React from 'react';\nimport {Fragment, useCallback, useState} from 'react';\n\nexport function ListItem({item, removeItem, toggleItem}) {\n  const handleDelete = useCallback(() => {\n    removeItem(item);\n  }, [item, removeItem]);\n\n  const handleToggle = useCallback(() => {\n    toggleItem(item);\n  }, [item, toggleItem]);\n\n  return (\n    <li>\n      <button onClick={handleDelete}>Delete</button>\n      <label>\n        <input\n          checked={item.isComplete}\n          onChange={handleToggle}\n          type=\"checkbox\"\n        />{' '}\n        {item.text}\n      </label>\n    </li>\n  );\n}\n\nexport function List(props) {\n  const [newItemText, setNewItemText] = useState('');\n  const [items, setItems] = useState([\n    {id: 1, isComplete: true, text: 'First'},\n    {id: 2, isComplete: true, text: 'Second'},\n    {id: 3, isComplete: false, text: 'Third'},\n  ]);\n  const [uid, setUID] = useState(4);\n\n  const handleClick = useCallback(() => {\n    if (newItemText !== '') {\n      setItems([\n        ...items,\n        {\n          id: uid,\n          isComplete: false,\n          text: newItemText,\n        },\n      ]);\n      setUID(uid + 1);\n      setNewItemText('');\n    }\n  }, [newItemText, items, uid]);\n\n  const handleKeyPress = useCallback(\n    event => {\n      if (event.key === 'Enter') {\n        handleClick();\n      }\n    },\n    [handleClick],\n  );\n\n  const handleChange = useCallback(\n    event => {\n      setNewItemText(event.currentTarget.value);\n    },\n    [setNewItemText],\n  );\n\n  const removeItem = useCallback(\n    itemToRemove => setItems(items.filter(item => item !== itemToRemove)),\n    [items],\n  );\n\n  const toggleItem = useCallback(\n    itemToToggle => {\n      // Dont use indexOf()\n      // because editing props in DevTools creates a new Object.\n      const index = items.findIndex(item => item.id === itemToToggle.id);\n\n      setItems(\n        items\n          .slice(0, index)\n          .concat({\n            ...itemToToggle,\n            isComplete: !itemToToggle.isComplete,\n          })\n          .concat(items.slice(index + 1)),\n      );\n    },\n    [items],\n  );\n\n  return (\n    <Fragment>\n      <h1>List</h1>\n      <input\n        type=\"text\"\n        placeholder=\"New list item...\"\n        value={newItemText}\n        onChange={handleChange}\n        onKeyPress={handleKeyPress}\n      />\n      <button disabled={newItemText === ''} onClick={handleClick}>\n        <span role=\"img\" aria-label=\"Add item\">\n          Add\n        </span>\n      </button>\n      <ul>\n        {items.map(item => (\n          <ListItem\n            key={item.id}\n            item={item}\n            removeItem={removeItem}\n            toggleItem={toggleItem}\n          />\n        ))}\n      </ul>\n    </Fragment>\n  );\n}\n"],"x_react_sources":[[{"names":["<no-hook>","handleDelete","handleToggle","newItemText","items","uid","handleClick","handleKeyPress","handleChange","removeItem","toggleItem"],"mappings":"CAAD;cuBCA;gBCDA;kBDEA;oBCFA;sCgBGA,AYHA;uCxBIA;2CxBJA;4CoBKA,AWLA;8CbMA;2DSNA;6DNOA;oEtBPA;sEoBQA;2EpBRA;6EkBSA;gFlBTA;kFkBUA;mGlBVA"}]]}}]}
\ No newline at end of file
diff --git a/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/inline/react-sources-extended/index-map/index.js b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/inline/react-sources-extended/index-map/index.js
new file mode 100644
index 0000000000000..e1b808404583a
--- /dev/null
+++ b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/inline/react-sources-extended/index-map/index.js
@@ -0,0 +1,89 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+Object.defineProperty(exports, "ComponentUsingHooksIndirectly", {
+  enumerable: true,
+  get: function () {
+    return _ComponentUsingHooksIndirectly.Component;
+  }
+});
+Object.defineProperty(exports, "ComponentWithCustomHook", {
+  enumerable: true,
+  get: function () {
+    return _ComponentWithCustomHook.Component;
+  }
+});
+Object.defineProperty(exports, "ComponentWithExternalCustomHooks", {
+  enumerable: true,
+  get: function () {
+    return _ComponentWithExternalCustomHooks.Component;
+  }
+});
+Object.defineProperty(exports, "ComponentWithMultipleHooksPerLine", {
+  enumerable: true,
+  get: function () {
+    return _ComponentWithMultipleHooksPerLine.Component;
+  }
+});
+Object.defineProperty(exports, "ComponentWithNestedHooks", {
+  enumerable: true,
+  get: function () {
+    return _ComponentWithNestedHooks.Component;
+  }
+});
+Object.defineProperty(exports, "ContainingStringSourceMappingURL", {
+  enumerable: true,
+  get: function () {
+    return _ContainingStringSourceMappingURL.Component;
+  }
+});
+Object.defineProperty(exports, "Example", {
+  enumerable: true,
+  get: function () {
+    return _Example.Component;
+  }
+});
+Object.defineProperty(exports, "InlineRequire", {
+  enumerable: true,
+  get: function () {
+    return _InlineRequire.Component;
+  }
+});
+Object.defineProperty(exports, "useTheme", {
+  enumerable: true,
+  get: function () {
+    return _useTheme.default;
+  }
+});
+exports.ToDoList = void 0;
+
+var _ComponentUsingHooksIndirectly = require("./ComponentUsingHooksIndirectly");
+
+var _ComponentWithCustomHook = require("./ComponentWithCustomHook");
+
+var _ComponentWithExternalCustomHooks = require("./ComponentWithExternalCustomHooks");
+
+var _ComponentWithMultipleHooksPerLine = require("./ComponentWithMultipleHooksPerLine");
+
+var _ComponentWithNestedHooks = require("./ComponentWithNestedHooks");
+
+var _ContainingStringSourceMappingURL = require("./ContainingStringSourceMappingURL");
+
+var _Example = require("./Example");
+
+var _InlineRequire = require("./InlineRequire");
+
+var ToDoList = _interopRequireWildcard(require("./ToDoList"));
+
+exports.ToDoList = ToDoList;
+
+var _useTheme = _interopRequireDefault(require("./useTheme"));
+
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
+
+function _getRequireWildcardCache() { if (typeof WeakMap !== "function") return null; var cache = new WeakMap(); _getRequireWildcardCache = function () { return cache; }; return cache; }
+
+function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } if (obj === null || typeof obj !== "object" && typeof obj !== "function") { return { default: obj }; } var cache = _getRequireWildcardCache(); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) { var desc = hasPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : null; if (desc && (desc.get || desc.set)) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } newObj.default = obj; if (cache) { cache.set(obj, newObj); } return newObj; }
+//# sourceMappingURL=data:application/json;charset=utf-8;base64,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
\ No newline at end of file
diff --git a/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/inline/react-sources-extended/index-map/useTheme.js b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/inline/react-sources-extended/index-map/useTheme.js
new file mode 100644
index 0000000000000..ccef363499319
--- /dev/null
+++ b/packages/react-devtools-extensions/src/__tests__/__source__/__compiled__/inline/react-sources-extended/index-map/useTheme.js
@@ -0,0 +1,27 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = useTheme;
+exports.ThemeContext = void 0;
+
+var _react = require("react");
+
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow
+ */
+const ThemeContext = /*#__PURE__*/(0, _react.createContext)('bright');
+exports.ThemeContext = ThemeContext;
+
+function useTheme() {
+  const theme = (0, _react.useContext)(ThemeContext);
+  (0, _react.useDebugValue)(theme);
+  return theme;
+}
+//# sourceMappingURL=data:application/json;charset=utf-8;base64,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
\ No newline at end of file
diff --git a/packages/react-devtools-extensions/src/__tests__/parseHookNames-test.js b/packages/react-devtools-extensions/src/__tests__/parseHookNames-test.js
index 272f5ddf5a527..cd61bea06cd21 100644
--- a/packages/react-devtools-extensions/src/__tests__/parseHookNames-test.js
+++ b/packages/react-devtools-extensions/src/__tests__/parseHookNames-test.js
@@ -193,6 +193,8 @@ describe('parseHookNames', () => {
       await test('./__source__/Example'); // original source (uncompiled)
       await test('./__source__/__compiled__/inline/Example'); // inline source map
       await test('./__source__/__compiled__/external/Example'); // external source map
+      await test('./__source__/__compiled__/inline/index-map/Example'); // inline index map source map
+      await test('./__source__/__compiled__/external/index-map/Example'); // external index map source map
       await test('./__source__/__compiled__/bundle/index', 'Example'); // bundle source map
       await test('./__source__/__compiled__/no-columns/Example'); // simulated Webpack 'cheap-module-source-map'
     });
@@ -225,6 +227,8 @@ describe('parseHookNames', () => {
       await test('./__source__/ToDoList'); // original source (uncompiled)
       await test('./__source__/__compiled__/inline/ToDoList'); // inline source map
       await test('./__source__/__compiled__/external/ToDoList'); // external source map
+      await test('./__source__/__compiled__/inline/index-map/ToDoList'); // inline index map source map
+      await test('./__source__/__compiled__/external/index-map/ToDoList'); // external index map source map
       await test('./__source__/__compiled__/bundle', 'ToDoList'); // bundle source map
       await test('./__source__/__compiled__/no-columns/ToDoList'); // simulated Webpack 'cheap-module-source-map'
     });
@@ -243,6 +247,12 @@ describe('parseHookNames', () => {
       await test('./__source__/ComponentWithCustomHook'); // original source (uncompiled)
       await test('./__source__/__compiled__/inline/ComponentWithCustomHook'); // inline source map
       await test('./__source__/__compiled__/external/ComponentWithCustomHook'); // external source map
+      await test(
+        './__source__/__compiled__/inline/index-map/ComponentWithCustomHook',
+      ); // inline index map source map
+      await test(
+        './__source__/__compiled__/external/index-map/ComponentWithCustomHook',
+      ); // external index map source map
       await test('./__source__/__compiled__/bundle', 'ComponentWithCustomHook'); // bundle source map
       await test(
         './__source__/__compiled__/no-columns/ComponentWithCustomHook',
@@ -266,6 +276,12 @@ describe('parseHookNames', () => {
       await test(
         './__source__/__compiled__/external/ComponentUsingHooksIndirectly',
       ); // external source map
+      await test(
+        './__source__/__compiled__/inline/index-map/ComponentUsingHooksIndirectly',
+      ); // inline index map source map
+      await test(
+        './__source__/__compiled__/external/index-map/ComponentUsingHooksIndirectly',
+      ); // external index map source map
       await test(
         './__source__/__compiled__/bundle',
         'ComponentUsingHooksIndirectly',
@@ -295,6 +311,12 @@ describe('parseHookNames', () => {
 
       await test('./__source__/__compiled__/inline/ComponentWithNestedHooks'); // inline source map
       await test('./__source__/__compiled__/external/ComponentWithNestedHooks'); // external source map
+      await test(
+        './__source__/__compiled__/inline/index-map/ComponentWithNestedHooks',
+      ); // inline index map source map
+      await test(
+        './__source__/__compiled__/external/index-map/ComponentWithNestedHooks',
+      ); // external index map source map
       await test(
         './__source__/__compiled__/bundle',
         'ComponentWithNestedHooks',
@@ -323,6 +345,12 @@ describe('parseHookNames', () => {
       await test(
         './__source__/__compiled__/external/ComponentWithExternalCustomHooks',
       ); // external source map
+      await test(
+        './__source__/__compiled__/inline/index-map/ComponentWithExternalCustomHooks',
+      ); // inline index map source map
+      await test(
+        './__source__/__compiled__/external/index-map/ComponentWithExternalCustomHooks',
+      ); // external index map source map
       await test(
         './__source__/__compiled__/bundle',
         'ComponentWithExternalCustomHooks',
@@ -350,6 +378,12 @@ describe('parseHookNames', () => {
       await test(
         './__source__/__compiled__/external/ComponentWithMultipleHooksPerLine',
       ); // external source map
+      await test(
+        './__source__/__compiled__/inline/index-map/ComponentWithMultipleHooksPerLine',
+      ); // inline index map source map
+      await test(
+        './__source__/__compiled__/external/index-map/ComponentWithMultipleHooksPerLine',
+      ); // external index map source map
       await test(
         './__source__/__compiled__/bundle',
         'ComponentWithMultipleHooksPerLine',
@@ -389,6 +423,8 @@ describe('parseHookNames', () => {
       await test('./__source__/InlineRequire'); // original source (uncompiled)
       await test('./__source__/__compiled__/inline/InlineRequire'); // inline source map
       await test('./__source__/__compiled__/external/InlineRequire'); // external source map
+      await test('./__source__/__compiled__/inline/index-map/InlineRequire'); // inline index map source map
+      await test('./__source__/__compiled__/external/index-map/InlineRequire'); // external index map source map
       await test('./__source__/__compiled__/bundle', 'InlineRequire'); // bundle source map
       await test('./__source__/__compiled__/no-columns/InlineRequire'); // simulated Webpack 'cheap-module-source-map'
     });
@@ -412,6 +448,12 @@ describe('parseHookNames', () => {
       await test(
         './__source__/__compiled__/external/ContainingStringSourceMappingURL',
       ); // external source map
+      await test(
+        './__source__/__compiled__/inline/index-map/ContainingStringSourceMappingURL',
+      ); // inline index map source map
+      await test(
+        './__source__/__compiled__/external/index-map/ContainingStringSourceMappingURL',
+      ); // external index map source map
       await test(
         './__source__/__compiled__/bundle',
         'ContainingStringSourceMappingURL',
@@ -423,21 +465,11 @@ describe('parseHookNames', () => {
   });
 
   describe('extended source maps', () => {
-    let parseMock;
-
     beforeEach(() => {
-      parseMock = jest.fn();
-      jest.mock('@babel/parser', () => {
-        const actual = jest.requireActual('@babel/parser');
-        const parse = (...args) => {
-          parseMock();
-          return actual.parse(...args);
-        };
-        return {
-          parse,
-          ...actual,
-        };
-      });
+      const babelParser = require('@babel/parser');
+      const generateHookMapModule = require('../generateHookMap');
+      jest.spyOn(babelParser, 'parse');
+      jest.spyOn(generateHookMapModule, 'decodeHookMap');
     });
 
     it('should work for simple components', async () => {
@@ -447,22 +479,37 @@ describe('parseHookNames', () => {
         expectHookNamesToEqual(hookNames, [
           'count', // useState
         ]);
-        expect(parseMock).toHaveBeenCalledTimes(0);
+        expect(require('@babel/parser').parse).toHaveBeenCalledTimes(0);
+        expect(require('../generateHookMap').decodeHookMap).toHaveBeenCalled();
       }
 
-      await test('./__source__/Example'); // original source (uncompiled)
       await test(
         './__source__/__compiled__/inline/fb-sources-extended/Example',
-      ); // x_fb_sources extended inline source map
+      ); // x_facebook_sources extended inline source map
       await test(
         './__source__/__compiled__/external/fb-sources-extended/Example',
-      ); // x_fb_sources extended external source map
+      ); // x_facebook_sources extended external source map
       await test(
         './__source__/__compiled__/inline/react-sources-extended/Example',
       ); // x_react_sources extended inline source map
       await test(
         './__source__/__compiled__/external/react-sources-extended/Example',
       ); // x_react_sources extended external source map
+
+      // Using index map format for source maps
+      await test(
+        './__source__/__compiled__/inline/fb-sources-extended/index-map/Example',
+      ); // x_facebook_sources extended inline index map source map
+      await test(
+        './__source__/__compiled__/external/fb-sources-extended/index-map/Example',
+      ); // x_facebook_sources extended external index map source map
+      await test(
+        './__source__/__compiled__/inline/react-sources-extended/index-map/Example',
+      ); // x_react_sources extended inline index map source map
+      await test(
+        './__source__/__compiled__/external/react-sources-extended/index-map/Example',
+      ); // x_react_sources extended external index map source map
+
       // TODO test no-columns and bundle cases with extended source maps
     });
 
@@ -490,22 +537,37 @@ describe('parseHookNames', () => {
           'handleToggle', // useCallback
         ]);
 
-        expect(parseMock).toHaveBeenCalledTimes(0);
+        expect(require('@babel/parser').parse).toHaveBeenCalledTimes(0);
+        expect(require('../generateHookMap').decodeHookMap).toHaveBeenCalled();
       }
 
-      await test('./__source__/ToDoList'); // original source (uncompiled)
       await test(
         './__source__/__compiled__/inline/fb-sources-extended/ToDoList',
-      ); // x_fb_sources extended inline source map
+      ); // x_facebook_sources extended inline source map
       await test(
         './__source__/__compiled__/external/fb-sources-extended/ToDoList',
-      ); // x_fb_sources extended external source map
+      ); // x_facebook_sources extended external source map
       await test(
         './__source__/__compiled__/inline/react-sources-extended/ToDoList',
       ); // x_react_sources extended inline source map
       await test(
         './__source__/__compiled__/external/react-sources-extended/ToDoList',
       ); // x_react_sources extended external source map
+
+      // Using index map format for source maps
+      await test(
+        './__source__/__compiled__/inline/fb-sources-extended/index-map/ToDoList',
+      ); // x_facebook_sources extended inline index map source map
+      await test(
+        './__source__/__compiled__/external/fb-sources-extended/index-map/ToDoList',
+      ); // x_facebook_sources extended external index map source map
+      await test(
+        './__source__/__compiled__/inline/react-sources-extended/index-map/ToDoList',
+      ); // x_react_sources extended inline index map source map
+      await test(
+        './__source__/__compiled__/external/react-sources-extended/index-map/ToDoList',
+      ); // x_react_sources extended external index map source map
+
       // TODO test no-columns and bundle cases with extended source maps
     });
 
@@ -518,22 +580,37 @@ describe('parseHookNames', () => {
           'isDarkMode', // useIsDarkMode()
           'isDarkMode', // useIsDarkMode -> useState()
         ]);
-        expect(parseMock).toHaveBeenCalledTimes(0);
+        expect(require('@babel/parser').parse).toHaveBeenCalledTimes(0);
+        expect(require('../generateHookMap').decodeHookMap).toHaveBeenCalled();
       }
 
-      await test('./__source__/ComponentWithCustomHook'); // original source (uncompiled)
       await test(
         './__source__/__compiled__/inline/fb-sources-extended/ComponentWithCustomHook',
-      ); // x_fb_sources extended inline source map
+      ); // x_facebook_sources extended inline source map
       await test(
         './__source__/__compiled__/external/fb-sources-extended/ComponentWithCustomHook',
-      ); // x_fb_sources extended external source map
+      ); // x_facebook_sources extended external source map
       await test(
         './__source__/__compiled__/inline/react-sources-extended/ComponentWithCustomHook',
       ); // x_react_sources extended inline source map
       await test(
         './__source__/__compiled__/external/react-sources-extended/ComponentWithCustomHook',
       ); // x_react_sources extended external source map
+
+      // Using index map format for source maps
+      await test(
+        './__source__/__compiled__/inline/fb-sources-extended/index-map/ComponentWithCustomHook',
+      ); // x_facebook_sources extended inline index map source map
+      await test(
+        './__source__/__compiled__/external/fb-sources-extended/index-map/ComponentWithCustomHook',
+      ); // x_facebook_sources extended external index map source map
+      await test(
+        './__source__/__compiled__/inline/react-sources-extended/index-map/ComponentWithCustomHook',
+      ); // x_react_sources extended inline index map source map
+      await test(
+        './__source__/__compiled__/external/react-sources-extended/index-map/ComponentWithCustomHook',
+      ); // x_react_sources extended external index map source map
+
       // TODO test no-columns and bundle cases with extended source maps
     });
 
@@ -546,21 +623,37 @@ describe('parseHookNames', () => {
           'darkMode', // useDarkMode()
           'isDarkMode', // useState()
         ]);
-        expect(parseMock).toHaveBeenCalledTimes(0);
+        expect(require('@babel/parser').parse).toHaveBeenCalledTimes(0);
+        expect(require('../generateHookMap').decodeHookMap).toHaveBeenCalled();
       }
 
       await test(
         './__source__/__compiled__/inline/fb-sources-extended/ComponentUsingHooksIndirectly',
-      ); // x_fb_sources extended inline source map
+      ); // x_facebook_sources extended inline source map
       await test(
         './__source__/__compiled__/external/fb-sources-extended/ComponentUsingHooksIndirectly',
-      ); // x_fb_sources extended external source map
+      ); // x_facebook_sources extended external source map
       await test(
         './__source__/__compiled__/inline/react-sources-extended/ComponentUsingHooksIndirectly',
       ); // x_react_sources extended inline source map
       await test(
         './__source__/__compiled__/external/react-sources-extended/ComponentUsingHooksIndirectly',
       ); // x_react_sources extended external source map
+
+      // Using index map format for source maps
+      await test(
+        './__source__/__compiled__/inline/fb-sources-extended/index-map/ComponentUsingHooksIndirectly',
+      ); // x_facebook_sources extended inline index map source map
+      await test(
+        './__source__/__compiled__/external/fb-sources-extended/index-map/ComponentUsingHooksIndirectly',
+      ); // x_facebook_sources extended external index map source map
+      await test(
+        './__source__/__compiled__/inline/react-sources-extended/index-map/ComponentUsingHooksIndirectly',
+      ); // x_react_sources extended inline index map source map
+      await test(
+        './__source__/__compiled__/external/react-sources-extended/index-map/ComponentUsingHooksIndirectly',
+      ); // x_react_sources extended external index map source map
+
       // TODO test no-columns and bundle cases with extended source maps
     });
 
@@ -580,21 +673,37 @@ describe('parseHookNames', () => {
         expectHookNamesToEqual(innerHookNames, [
           'state', // useState()
         ]);
-        expect(parseMock).toHaveBeenCalledTimes(0);
+        expect(require('@babel/parser').parse).toHaveBeenCalledTimes(0);
+        expect(require('../generateHookMap').decodeHookMap).toHaveBeenCalled();
       }
 
       await test(
         './__source__/__compiled__/inline/fb-sources-extended/ComponentWithNestedHooks',
-      ); // x_fb_sources extended inline source map
+      ); // x_facebook_sources extended inline source map
       await test(
         './__source__/__compiled__/external/fb-sources-extended/ComponentWithNestedHooks',
-      ); // x_fb_sources extended external source map
+      ); // x_facebook_sources extended external source map
       await test(
         './__source__/__compiled__/inline/react-sources-extended/ComponentWithNestedHooks',
       ); // x_react_sources extended inline source map
       await test(
         './__source__/__compiled__/external/react-sources-extended/ComponentWithNestedHooks',
       ); // x_react_sources extended external source map
+
+      // Using index map format for source maps
+      await test(
+        './__source__/__compiled__/inline/fb-sources-extended/index-map/ComponentWithNestedHooks',
+      ); // x_facebook_sources extended inline index map source map
+      await test(
+        './__source__/__compiled__/external/fb-sources-extended/index-map/ComponentWithNestedHooks',
+      ); // x_facebook_sources extended external index map source map
+      await test(
+        './__source__/__compiled__/inline/react-sources-extended/index-map/ComponentWithNestedHooks',
+      ); // x_react_sources extended inline index map source map
+      await test(
+        './__source__/__compiled__/external/react-sources-extended/index-map/ComponentWithNestedHooks',
+      ); // x_react_sources extended external index map source map
+
       // TODO test no-columns and bundle cases with extended source maps
     });
 
@@ -606,7 +715,8 @@ describe('parseHookNames', () => {
           'theme', // useTheme()
           'theme', // useContext()
         ]);
-        expect(parseMock).toHaveBeenCalledTimes(0);
+        expect(require('@babel/parser').parse).toHaveBeenCalledTimes(0);
+        expect(require('../generateHookMap').decodeHookMap).toHaveBeenCalled();
       }
 
       // We can't test the uncompiled source here, because it either needs to get transformed,
@@ -614,16 +724,31 @@ describe('parseHookNames', () => {
 
       await test(
         './__source__/__compiled__/inline/fb-sources-extended/ComponentWithExternalCustomHooks',
-      ); // x_fb_sources extended inline source map
+      ); // x_facebook_sources extended inline source map
       await test(
         './__source__/__compiled__/external/fb-sources-extended/ComponentWithExternalCustomHooks',
-      ); // x_fb_sources extended external source map
+      ); // x_facebook_sources extended external source map
       await test(
         './__source__/__compiled__/inline/react-sources-extended/ComponentWithExternalCustomHooks',
       ); // x_react_sources extended inline source map
       await test(
         './__source__/__compiled__/external/react-sources-extended/ComponentWithExternalCustomHooks',
       ); // x_react_sources extended external source map
+
+      // Using index map format for source maps
+      await test(
+        './__source__/__compiled__/inline/fb-sources-extended/index-map/ComponentWithExternalCustomHooks',
+      ); // x_facebook_sources extended inline index map source map
+      await test(
+        './__source__/__compiled__/external/fb-sources-extended/index-map/ComponentWithExternalCustomHooks',
+      ); // x_facebook_sources extended external index map source map
+      await test(
+        './__source__/__compiled__/inline/react-sources-extended/index-map/ComponentWithExternalCustomHooks',
+      ); // x_react_sources extended inline index map source map
+      await test(
+        './__source__/__compiled__/external/react-sources-extended/index-map/ComponentWithExternalCustomHooks',
+      ); // x_react_sources extended external index map source map
+
       // TODO test no-columns and bundle cases with extended source maps
     });
 
@@ -637,21 +762,37 @@ describe('parseHookNames', () => {
           'c', // useContext()
           'd', // useContext()
         ]);
-        expect(parseMock).toHaveBeenCalledTimes(0);
+        expect(require('@babel/parser').parse).toHaveBeenCalledTimes(0);
+        expect(require('../generateHookMap').decodeHookMap).toHaveBeenCalled();
       }
 
       await test(
         './__source__/__compiled__/inline/fb-sources-extended/ComponentWithMultipleHooksPerLine',
-      ); // x_fb_sources extended inline source map
+      ); // x_facebook_sources extended inline source map
       await test(
         './__source__/__compiled__/external/fb-sources-extended/ComponentWithMultipleHooksPerLine',
-      ); // x_fb_sources extended external source map
+      ); // x_facebook_sources extended external source map
       await test(
         './__source__/__compiled__/inline/react-sources-extended/ComponentWithMultipleHooksPerLine',
       ); // x_react_sources extended inline source map
       await test(
         './__source__/__compiled__/external/react-sources-extended/ComponentWithMultipleHooksPerLine',
       ); // x_react_sources extended external source map
+
+      // Using index map format for source maps
+      await test(
+        './__source__/__compiled__/inline/fb-sources-extended/index-map/ComponentWithMultipleHooksPerLine',
+      ); // x_facebook_sources extended inline index map source map
+      await test(
+        './__source__/__compiled__/external/fb-sources-extended/index-map/ComponentWithMultipleHooksPerLine',
+      ); // x_facebook_sources extended external index map source map
+      await test(
+        './__source__/__compiled__/inline/react-sources-extended/index-map/ComponentWithMultipleHooksPerLine',
+      ); // x_react_sources extended inline index map source map
+      await test(
+        './__source__/__compiled__/external/react-sources-extended/index-map/ComponentWithMultipleHooksPerLine',
+      ); // x_react_sources extended external index map source map
+
       // TODO test no-columns and bundle cases with extended source maps
     });
 
@@ -665,22 +806,37 @@ describe('parseHookNames', () => {
         expectHookNamesToEqual(hookNames, [
           'count', // useState()
         ]);
-        expect(parseMock).toHaveBeenCalledTimes(0);
+        expect(require('@babel/parser').parse).toHaveBeenCalledTimes(0);
+        expect(require('../generateHookMap').decodeHookMap).toHaveBeenCalled();
       }
 
-      await test('./__source__/InlineRequire'); // original source (uncompiled)
       await test(
         './__source__/__compiled__/inline/fb-sources-extended/InlineRequire',
-      ); // x_fb_sources extended inline source map
+      ); // x_facebook_sources extended inline source map
       await test(
         './__source__/__compiled__/external/fb-sources-extended/InlineRequire',
-      ); // x_fb_sources extended external source map
+      ); // x_facebook_sources extended external source map
       await test(
         './__source__/__compiled__/inline/react-sources-extended/InlineRequire',
       ); // x_react_sources extended inline source map
       await test(
         './__source__/__compiled__/external/react-sources-extended/InlineRequire',
       ); // x_react_sources extended external source map
+
+      // Using index map format for source maps
+      await test(
+        './__source__/__compiled__/inline/fb-sources-extended/index-map/InlineRequire',
+      ); // x_facebook_sources extended inline index map source map
+      await test(
+        './__source__/__compiled__/external/fb-sources-extended/index-map/InlineRequire',
+      ); // x_facebook_sources extended external index map source map
+      await test(
+        './__source__/__compiled__/inline/react-sources-extended/index-map/InlineRequire',
+      ); // x_react_sources extended inline index map source map
+      await test(
+        './__source__/__compiled__/external/react-sources-extended/index-map/InlineRequire',
+      ); // x_react_sources extended external index map source map
+
       // TODO test no-columns and bundle cases with extended source maps
     });
 
@@ -691,25 +847,40 @@ describe('parseHookNames', () => {
         expectHookNamesToEqual(hookNames, [
           'count', // useState()
         ]);
-        expect(parseMock).toHaveBeenCalledTimes(0);
+        expect(require('@babel/parser').parse).toHaveBeenCalledTimes(0);
+        expect(require('../generateHookMap').decodeHookMap).toHaveBeenCalled();
       }
 
       // We expect the inline sourceMappingURL to be invalid in this case; mute the warning.
       console.warn = () => {};
 
-      await test('./__source__/ContainingStringSourceMappingURL'); // original source (uncompiled)
       await test(
         './__source__/__compiled__/inline/fb-sources-extended/ContainingStringSourceMappingURL',
-      ); // x_fb_sources extended inline source map
+      ); // x_facebook_sources extended inline source map
       await test(
         './__source__/__compiled__/external/fb-sources-extended/ContainingStringSourceMappingURL',
-      ); // x_fb_sources extended external source map
+      ); // x_facebook_sources extended external source map
       await test(
         './__source__/__compiled__/inline/react-sources-extended/ContainingStringSourceMappingURL',
       ); // x_react_sources extended inline source map
       await test(
         './__source__/__compiled__/external/react-sources-extended/ContainingStringSourceMappingURL',
       ); // x_react_sources extended external source map
+
+      // Using index map format for source maps
+      await test(
+        './__source__/__compiled__/inline/fb-sources-extended/index-map/ContainingStringSourceMappingURL',
+      ); // x_facebook_sources extended inline index map source map
+      await test(
+        './__source__/__compiled__/external/fb-sources-extended/index-map/ContainingStringSourceMappingURL',
+      ); // x_facebook_sources extended external index map source map
+      await test(
+        './__source__/__compiled__/inline/react-sources-extended/index-map/ContainingStringSourceMappingURL',
+      ); // x_react_sources extended inline index map source map
+      await test(
+        './__source__/__compiled__/external/react-sources-extended/index-map/ContainingStringSourceMappingURL',
+      ); // x_react_sources extended external index map source map
+
       // TODO test no-columns and bundle cases with extended source maps
     });
   });
diff --git a/packages/react-devtools-extensions/src/__tests__/updateMockSourceMaps.js b/packages/react-devtools-extensions/src/__tests__/updateMockSourceMaps.js
index 48f947dfec11d..7af2a949067cc 100644
--- a/packages/react-devtools-extensions/src/__tests__/updateMockSourceMaps.js
+++ b/packages/react-devtools-extensions/src/__tests__/updateMockSourceMaps.js
@@ -24,11 +24,21 @@ const externalDir = resolve(buildRoot, 'external');
 const inlineDir = resolve(buildRoot, 'inline');
 const bundleDir = resolve(buildRoot, 'bundle');
 const noColumnsDir = resolve(buildRoot, 'no-columns');
+const inlineIndexMapDir = resolve(inlineDir, 'index-map');
+const externalIndexMapDir = resolve(externalDir, 'index-map');
 const inlineFbSourcesExtendedDir = resolve(inlineDir, 'fb-sources-extended');
 const externalFbSourcesExtendedDir = resolve(
   externalDir,
   'fb-sources-extended',
 );
+const inlineFbSourcesIndexMapExtendedDir = resolve(
+  inlineFbSourcesExtendedDir,
+  'index-map',
+);
+const externalFbSourcesIndexMapExtendedDir = resolve(
+  externalFbSourcesExtendedDir,
+  'index-map',
+);
 const inlineReactSourcesExtendedDir = resolve(
   inlineDir,
   'react-sources-extended',
@@ -37,6 +47,14 @@ const externalReactSourcesExtendedDir = resolve(
   externalDir,
   'react-sources-extended',
 );
+const inlineReactSourcesIndexMapExtendedDir = resolve(
+  inlineReactSourcesExtendedDir,
+  'index-map',
+);
+const externalReactSourcesIndexMapExtendedDir = resolve(
+  externalReactSourcesExtendedDir,
+  'index-map',
+);
 
 // Remove previous builds
 emptyDirSync(buildRoot);
@@ -44,10 +62,16 @@ mkdirSync(externalDir);
 mkdirSync(inlineDir);
 mkdirSync(bundleDir);
 mkdirSync(noColumnsDir);
+mkdirSync(inlineIndexMapDir);
+mkdirSync(externalIndexMapDir);
 mkdirSync(inlineFbSourcesExtendedDir);
 mkdirSync(externalFbSourcesExtendedDir);
 mkdirSync(inlineReactSourcesExtendedDir);
 mkdirSync(externalReactSourcesExtendedDir);
+mkdirSync(inlineFbSourcesIndexMapExtendedDir);
+mkdirSync(externalFbSourcesIndexMapExtendedDir);
+mkdirSync(inlineReactSourcesIndexMapExtendedDir);
+mkdirSync(externalReactSourcesIndexMapExtendedDir);
 
 function compile(fileName) {
   const code = readFileSync(resolve(sourceDir, fileName), 'utf8');
@@ -124,8 +148,44 @@ function compile(fileName) {
     'utf8',
   );
 
-  // Generate compiled output with an extended sourcemap that
-  // includes a map of hook names.
+  // Artificially construct a source map that uses the index map format
+  // (https://sourcemaps.info/spec.html#h.535es3xeprgt)
+  const indexMap = {
+    version: sourceMap.version,
+    file: sourceMap.file,
+    sections: [
+      {
+        offset: {
+          line: 0,
+          column: 0,
+        },
+        map: {...sourceMap},
+      },
+    ],
+  };
+
+  // Generate compiled output using external source maps using index map format
+  writeFileSync(
+    resolve(externalIndexMapDir, fileName),
+    transformed.code + `\n//# sourceMappingURL=${fileName}.map`,
+    'utf8',
+  );
+  writeFileSync(
+    resolve(externalIndexMapDir, `${fileName}.map`),
+    JSON.stringify(indexMap),
+    'utf8',
+  );
+
+  // Generate compiled output with inline base64 source maps using index map format
+  writeFileSync(
+    resolve(inlineIndexMapDir, fileName),
+    transformed.code +
+      '\n//# sourceMappingURL=data:application/json;charset=utf-8;base64,' +
+      btoa(JSON.stringify(indexMap)),
+    'utf8',
+  );
+
+  // Generate compiled output with an extended sourcemap that includes a map of hook names.
   const parsed = parse(code, {
     sourceType: 'module',
     plugins: ['jsx', 'flow'],
@@ -139,12 +199,38 @@ function compile(fileName) {
     // the second item.
     x_facebook_sources: [[null, [encodedHookMap]]],
   };
+  const fbSourcesExtendedIndexMap = {
+    version: fbSourcesExtendedSourceMap.version,
+    file: fbSourcesExtendedSourceMap.file,
+    sections: [
+      {
+        offset: {
+          line: 0,
+          column: 0,
+        },
+        map: {...fbSourcesExtendedSourceMap},
+      },
+    ],
+  };
   const reactSourcesExtendedSourceMap = {
     ...sourceMap,
     // When using the x_react_sources extension field, the first item
     // for a given source is reserved for the Hook Map.
     x_react_sources: [[encodedHookMap]],
   };
+  const reactSourcesExtendedIndexMap = {
+    version: reactSourcesExtendedSourceMap.version,
+    file: reactSourcesExtendedSourceMap.file,
+    sections: [
+      {
+        offset: {
+          line: 0,
+          column: 0,
+        },
+        map: {...reactSourcesExtendedSourceMap},
+      },
+    ],
+  };
 
   // Using the x_facebook_sources field
   writeFileSync(
@@ -164,6 +250,24 @@ function compile(fileName) {
     JSON.stringify(fbSourcesExtendedSourceMap),
     'utf8',
   );
+  // Using the x_facebook_sources field on an index map format
+  writeFileSync(
+    resolve(inlineFbSourcesIndexMapExtendedDir, fileName),
+    transformed.code +
+      '\n//# sourceMappingURL=data:application/json;charset=utf-8;base64,' +
+      btoa(JSON.stringify(fbSourcesExtendedIndexMap)),
+    'utf8',
+  );
+  writeFileSync(
+    resolve(externalFbSourcesIndexMapExtendedDir, fileName),
+    transformed.code + `\n//# sourceMappingURL=${fileName}.map`,
+    'utf8',
+  );
+  writeFileSync(
+    resolve(externalFbSourcesIndexMapExtendedDir, `${fileName}.map`),
+    JSON.stringify(fbSourcesExtendedIndexMap),
+    'utf8',
+  );
 
   // Using the x_react_sources field
   writeFileSync(
@@ -183,6 +287,24 @@ function compile(fileName) {
     JSON.stringify(reactSourcesExtendedSourceMap),
     'utf8',
   );
+  // Using the x_react_sources field on an index map format
+  writeFileSync(
+    resolve(inlineReactSourcesIndexMapExtendedDir, fileName),
+    transformed.code +
+      '\n//# sourceMappingURL=data:application/json;charset=utf-8;base64,' +
+      btoa(JSON.stringify(reactSourcesExtendedIndexMap)),
+    'utf8',
+  );
+  writeFileSync(
+    resolve(externalReactSourcesIndexMapExtendedDir, fileName),
+    transformed.code + `\n//# sourceMappingURL=${fileName}.map`,
+    'utf8',
+  );
+  writeFileSync(
+    resolve(externalReactSourcesIndexMapExtendedDir, `${fileName}.map`),
+    JSON.stringify(reactSourcesExtendedIndexMap),
+    'utf8',
+  );
 }
 
 async function bundle() {
diff --git a/packages/react-devtools-extensions/src/parseHookNames/parseHookNames.js b/packages/react-devtools-extensions/src/parseHookNames/parseHookNames.js
index edaf1a5e0ea1b..9f1faa8aafd24 100644
--- a/packages/react-devtools-extensions/src/parseHookNames/parseHookNames.js
+++ b/packages/react-devtools-extensions/src/parseHookNames/parseHookNames.js
@@ -14,11 +14,9 @@ import {getHookName} from '../astUtils';
 import {areSourceMapsAppliedToErrors} from '../ErrorTester';
 import {__DEBUG__} from 'react-devtools-shared/src/constants';
 import {getHookSourceLocationKey} from 'react-devtools-shared/src/hookNamesCache';
-import {decodeHookMap} from '../generateHookMap';
-import {getHookNameForLocation} from '../getHookNameForLocation';
+import {sourceMapIncludesSource} from '../SourceMapUtils';
+import {SourceMapMetadataConsumer} from '../SourceMapMetadataConsumer';
 
-import type {MixedSourceMap} from '../SourceMapTypes';
-import type {HookMap} from '../generateHookMap';
 import type {
   HooksNode,
   HookSource,
@@ -30,18 +28,16 @@ import type {SourceConsumer} from '../astUtils';
 
 const SOURCE_MAP_REGEX = / ?sourceMappingURL=([^\s'"]+)/gm;
 const MAX_SOURCE_LENGTH = 100_000_000;
-const REACT_SOURCES_EXTENSION_KEY = 'x_react_sources';
-const FB_SOURCES_EXTENSION_KEY = 'x_facebook_sources';
 
 type AST = mixed;
 
 type HookSourceData = {|
-  // Hook map extracted from extended source map
-  hookMap: HookMap | null,
-
   // Generated by react-debug-tools.
   hookSource: HookSource,
 
+  // API for consuming metadfata present in extended source map.
+  metadataConsumer: SourceMapMetadataConsumer | null,
+
   // AST for original source code; typically comes from a consumed source map.
   originalSourceAST: AST | null,
 
@@ -68,6 +64,7 @@ type HookSourceData = {|
 
 type CachedRuntimeCodeMetadata = {|
   sourceConsumer: SourceConsumer | null,
+  metadataConsumer: SourceMapMetadataConsumer | null,
 |};
 
 const runtimeURLToMetadataCache: LRUCache<
@@ -137,8 +134,8 @@ export async function parseHookNames(
       const runtimeSourceURL = ((hookSource.fileName: any): string);
 
       const hookSourceData: HookSourceData = {
-        hookMap: null,
         hookSource,
+        metadataConsumer: null,
         originalSourceAST: null,
         originalSourceCode: null,
         originalSourceURL: null,
@@ -162,6 +159,7 @@ export async function parseHookNames(
           console.groupEnd();
         }
         hookSourceData.sourceConsumer = runtimeMetadata.sourceConsumer;
+        hookSourceData.metadataConsumer = runtimeMetadata.metadataConsumer;
       }
 
       locationKeyToHookSourceData.set(locationKey, hookSourceData);
@@ -213,8 +211,11 @@ function extractAndLoadSourceMaps(
 
   const setPromises = [];
   locationKeyToHookSourceData.forEach(hookSourceData => {
-    if (hookSourceData.sourceConsumer != null) {
-      // Use cached source map consumer.
+    if (
+      hookSourceData.sourceConsumer != null &&
+      hookSourceData.metadataConsumer != null
+    ) {
+      // Use cached source map and metadata consumers.
       return;
     }
 
@@ -230,8 +231,8 @@ function extractAndLoadSourceMaps(
       for (let i = 0; i < sourceMappingURLs.length; i++) {
         const {runtimeSourceURL} = hookSourceData;
         const sourceMappingURL = sourceMappingURLs[i];
-        const index = sourceMappingURL.indexOf('base64,');
-        if (index >= 0) {
+        const hasInlineSourceMap = sourceMappingURL.indexOf('base64,') >= 0;
+        if (hasInlineSourceMap) {
           // TODO (named hooks) deduplicate parsing in this branch (similar to fetching in the other branch)
           // since there can be multiple location keys per source map.
 
@@ -254,16 +255,10 @@ function extractAndLoadSourceMaps(
 
           // Hook source might be a URL like "https://4syus.csb.app/src/App.js"
           // Parsed source map might be a partial path like "src/App.js"
-          const sourceIndex = parsed.sources.findIndex(
-            source =>
-              source === 'Inline Babel script' ||
-              runtimeSourceURL.endsWith(source),
-          );
-          if (sourceIndex !== -1) {
-            const hookMap = extractHookMapFromSourceMap(parsed, sourceIndex);
-            if (hookMap != null) {
-              hookSourceData.hookMap = hookMap;
-            }
+          if (sourceMapIncludesSource(parsed, runtimeSourceURL)) {
+            hookSourceData.metadataConsumer = new SourceMapMetadataConsumer(
+              parsed,
+            );
             setPromises.push(
               new SourceMapConsumer(parsed).then(sourceConsumer => {
                 hookSourceData.sourceConsumer = sourceConsumer;
@@ -304,19 +299,10 @@ function extractAndLoadSourceMaps(
             fetchFile(url).then(
               sourceMapContents => {
                 const parsed = JSON.parse(sourceMapContents);
-                const sourceIndex = parsed.sources.findIndex(source =>
-                  runtimeSourceURL.endsWith(source),
-                );
-                if (sourceIndex !== -1) {
-                  const hookMap = extractHookMapFromSourceMap(
-                    parsed,
-                    sourceIndex,
-                  );
-                  if (hookMap != null) {
-                    hookSourceData.hookMap = hookMap;
-                  }
-                }
-                return new SourceMapConsumer(parsed);
+                return new SourceMapConsumer(parsed).then(sourceConsumer => ({
+                  sourceConsumer,
+                  metadataConsumer: new SourceMapMetadataConsumer(parsed),
+                }));
               },
               // In this case, we fall back to the assumption that the source has no source map.
               // This might indicate an (unlikely) edge case that had no source map,
@@ -334,8 +320,10 @@ function extractAndLoadSourceMaps(
 
           fetchPromises.set(url, fetchPromise);
           setPromises.push(
-            fetchPromise.then(sourceConsumer => {
-              hookSourceData.sourceConsumer = sourceConsumer;
+            fetchPromise.then(result => {
+              hookSourceData.metadataConsumer =
+                result?.metadataConsumer ?? null;
+              hookSourceData.sourceConsumer = result?.sourceConsumer ?? null;
             }),
           );
           break;
@@ -404,7 +392,7 @@ function findHookNames(
       return null; // Should not be reachable.
     }
 
-    const sourceConsumer = hookSourceData.sourceConsumer;
+    const {originalSourceURL, sourceConsumer} = hookSourceData;
 
     let originalSourceColumnNumber;
     let originalSourceLineNumber;
@@ -435,22 +423,24 @@ function findHookNames(
     }
 
     if (
-      originalSourceLineNumber === null ||
-      originalSourceColumnNumber === null
+      originalSourceLineNumber == null ||
+      originalSourceColumnNumber == null ||
+      originalSourceURL == null
     ) {
       return null;
     }
 
     let name;
-    if (hookSourceData.hookMap != null) {
-      name = getHookNameForLocation(
-        {
-          line: originalSourceLineNumber,
-          column: originalSourceColumnNumber,
-        },
-        hookSourceData.hookMap,
-      );
-    } else {
+    const {metadataConsumer} = hookSourceData;
+    if (metadataConsumer != null) {
+      name = metadataConsumer.hookNameFor({
+        line: originalSourceLineNumber,
+        column: originalSourceColumnNumber,
+        source: originalSourceURL,
+      });
+    }
+
+    if (name == null) {
       name = getHookName(
         hook,
         hookSourceData.originalSourceAST,
@@ -513,16 +503,12 @@ async function parseSourceAST(
       // Use cached metadata.
       return;
     }
-    if (hookSourceData.hookMap != null) {
-      // If there's a hook map present from an extended sourcemap then
-      // we don't need to parse the source files and instead can use the
-      // hook map to extract hook names.
-      return;
-    }
 
-    const {sourceConsumer} = hookSourceData;
+    const {metadataConsumer, sourceConsumer} = hookSourceData;
     const runtimeSourceCode = ((hookSourceData.runtimeSourceCode: any): string);
-    let originalSourceURL, originalSourceCode;
+    let hasHookMap = false;
+    let originalSourceURL;
+    let originalSourceCode;
     if (sourceConsumer !== null) {
       // Parse and extract the AST from the source map.
       const {lineNumber, columnNumber} = hookSourceData.hookSource;
@@ -563,6 +549,13 @@ async function parseSourceAST(
         console.log(originalSourceCode);
         console.groupEnd();
       }
+
+      if (
+        metadataConsumer != null &&
+        metadataConsumer.hasHookMap(originalSourceURL)
+      ) {
+        hasHookMap = true;
+      }
     } else {
       // There's no source map to parse here so we can just parse the original source itself.
       originalSourceCode = runtimeSourceCode;
@@ -574,6 +567,13 @@ async function parseSourceAST(
     hookSourceData.originalSourceCode = originalSourceCode;
     hookSourceData.originalSourceURL = originalSourceURL;
 
+    if (hasHookMap) {
+      // If there's a hook map present from an extended sourcemap then
+      // we don't need to parse the source files and instead can use the
+      // hook map to extract hook names.
+      return;
+    }
+
     // The cache also serves to deduplicate parsing by URL in our loop over
     // location keys. This may need to change if we switch to async parsing.
     const sourceMetadata = originalURLToMetadataCache.get(originalSourceURL);
@@ -645,58 +645,26 @@ function isUnnamedBuiltInHook(hook: HooksNode) {
 function updateLruCache(
   locationKeyToHookSourceData: Map<string, HookSourceData>,
 ): Promise<*> {
-  locationKeyToHookSourceData.forEach(({sourceConsumer, runtimeSourceURL}) => {
-    // Only set once to avoid triggering eviction/cleanup code.
-    if (!runtimeURLToMetadataCache.has(runtimeSourceURL)) {
-      if (__DEBUG__) {
-        console.log(
-          `updateLruCache() Caching runtime metadata for "${runtimeSourceURL}"`,
-        );
-      }
+  locationKeyToHookSourceData.forEach(
+    ({metadataConsumer, sourceConsumer, runtimeSourceURL}) => {
+      // Only set once to avoid triggering eviction/cleanup code.
+      if (!runtimeURLToMetadataCache.has(runtimeSourceURL)) {
+        if (__DEBUG__) {
+          console.log(
+            `updateLruCache() Caching runtime metadata for "${runtimeSourceURL}"`,
+          );
+        }
 
-      runtimeURLToMetadataCache.set(runtimeSourceURL, {
-        sourceConsumer,
-      });
-    }
-  });
+        runtimeURLToMetadataCache.set(runtimeSourceURL, {
+          metadataConsumer,
+          sourceConsumer,
+        });
+      }
+    },
+  );
   return Promise.resolve();
 }
 
-function extractHookMapFromSourceMap(
-  sourcemap: MixedSourceMap,
-  sourceIndex: number,
-): HookMap | null {
-  let reactMetadataForSource;
-  if (
-    sourcemap.hasOwnProperty(REACT_SOURCES_EXTENSION_KEY) &&
-    sourcemap[REACT_SOURCES_EXTENSION_KEY] != null
-  ) {
-    // When using the x_react_sources extension field, the first item
-    // for a given source is reserved for the Hook Map, which is why
-    // we look up the index at position 0.
-    reactMetadataForSource =
-      sourcemap[REACT_SOURCES_EXTENSION_KEY][sourceIndex];
-  } else if (
-    sourcemap.hasOwnProperty(FB_SOURCES_EXTENSION_KEY) &&
-    sourcemap[FB_SOURCES_EXTENSION_KEY] != null
-  ) {
-    // When using the x_facebook_sources extension field, the first item
-    // for a given source is reserved for the Function Map, and the
-    // React sources metadata (which includes the Hook Map) is added as
-    // the second item, which is why we look up the index at position 1.
-    const fbMetadataForSource =
-      sourcemap[FB_SOURCES_EXTENSION_KEY][sourceIndex];
-    reactMetadataForSource =
-      fbMetadataForSource != null ? fbMetadataForSource[1] : null;
-  }
-  const hookMap =
-    reactMetadataForSource != null ? reactMetadataForSource[0] : null;
-  if (hookMap != null) {
-    return decodeHookMap(hookMap);
-  }
-  return null;
-}
-
 export function purgeCachedMetadata(): void {
   originalURLToMetadataCache.reset();
   runtimeURLToMetadataCache.reset();