[DevTools] Remove experimental __IS_INTERNAL_MCP_BUILD__ flag and related code

.eslintrc.js

@@ -507,7 +507,6 @@ module.exports = {
         __IS_FIREFOX__: 'readonly',
         __IS_EDGE__: 'readonly',
         __IS_NATIVE__: 'readonly',
-        __IS_INTERNAL_MCP_BUILD__: 'readonly',
         __IS_INTERNAL_VERSION__: 'readonly',
         chrome: 'readonly',
       },

packages/react-devtools-core/webpack.backend.js

@@ -72,7 +72,6 @@ module.exports = {
       __IS_CHROME__: false,
       __IS_EDGE__: false,
       __IS_NATIVE__: true,
-      __IS_INTERNAL_MCP_BUILD__: false,
       'process.env.DEVTOOLS_PACKAGE': `"react-devtools-core"`,
       'process.env.DEVTOOLS_VERSION': `"${DEVTOOLS_VERSION}"`,
       'process.env.GITHUB_URL': `"${GITHUB_URL}"`,

packages/react-devtools-core/webpack.standalone.js

@@ -91,7 +91,6 @@ module.exports = {
       __IS_FIREFOX__: false,
       __IS_CHROME__: false,
       __IS_EDGE__: false,
-      __IS_INTERNAL_MCP_BUILD__: false,
       'process.env.DEVTOOLS_PACKAGE': `"react-devtools-core"`,
       'process.env.DEVTOOLS_VERSION': `"${DEVTOOLS_VERSION}"`,
       'process.env.EDITOR_URL': EDITOR_URL != null ? `"${EDITOR_URL}"` : null,

packages/react-devtools-extensions/webpack.config.js

@@ -34,8 +34,6 @@ const IS_FIREFOX = process.env.IS_FIREFOX === 'true';
 const IS_EDGE = process.env.IS_EDGE === 'true';
 const IS_INTERNAL_VERSION = process.env.FEATURE_FLAG_TARGET === 'extension-fb';
 
-const IS_INTERNAL_MCP_BUILD = process.env.IS_INTERNAL_MCP_BUILD === 'true';
-
 const featureFlagTarget = process.env.FEATURE_FLAG_TARGET || 'extension-oss';
 
 let statsFileName = `webpack-stats.${featureFlagTarget}.${__DEV__ ? 'development' : 'production'}`;
@@ -48,9 +46,6 @@ if (IS_FIREFOX) {
 if (IS_EDGE) {
   statsFileName += `.edge`;
 }
-if (IS_INTERNAL_MCP_BUILD) {
-  statsFileName += `.mcp`;
-}
 statsFileName += '.json';
 
 const babelOptions = {
@@ -139,7 +134,6 @@ module.exports = {
       __IS_FIREFOX__: IS_FIREFOX,
       __IS_EDGE__: IS_EDGE,
       __IS_NATIVE__: false,
-      __IS_INTERNAL_MCP_BUILD__: IS_INTERNAL_MCP_BUILD,
       __IS_INTERNAL_VERSION__: IS_INTERNAL_VERSION,
       'process.env.DEVTOOLS_PACKAGE': `"react-devtools-extensions"`,
       'process.env.DEVTOOLS_VERSION': `"${DEVTOOLS_VERSION}"`,

packages/react-devtools-fusebox/webpack.config.frontend.js

@@ -85,7 +85,6 @@ module.exports = {
       __IS_CHROME__: false,
       __IS_FIREFOX__: false,
       __IS_EDGE__: false,
-      __IS_INTERNAL_MCP_BUILD__: false,
       'process.env.DEVTOOLS_PACKAGE': `"react-devtools-fusebox"`,
       'process.env.DEVTOOLS_VERSION': `"${DEVTOOLS_VERSION}"`,
       'process.env.EDITOR_URL': EDITOR_URL != null ? `"${EDITOR_URL}"` : null,

packages/react-devtools-inline/webpack.config.js

@@ -77,7 +77,6 @@ module.exports = {
       __IS_FIREFOX__: false,
       __IS_EDGE__: false,
       __IS_NATIVE__: false,
-      __IS_INTERNAL_MCP_BUILD__: false,
       'process.env.DEVTOOLS_PACKAGE': `"react-devtools-inline"`,
       'process.env.DEVTOOLS_VERSION': `"${DEVTOOLS_VERSION}"`,
       'process.env.EDITOR_URL': EDITOR_URL != null ? `"${EDITOR_URL}"` : null,

packages/react-devtools-shared/src/backend/fiber/renderer.js

@@ -8817,86 +8817,6 @@ export function attach(
     return unresolvedSource;
   }
 
-  type InternalMcpFunctions = {
-    __internal_only_getComponentTree?: Function,
-  };
-
-  const internalMcpFunctions: InternalMcpFunctions = {};
-  if (__IS_INTERNAL_MCP_BUILD__) {
-    // eslint-disable-next-line no-inner-declarations
-    function __internal_only_getComponentTree(): string {
-      let treeString = '';
-
-      function buildTreeString(
-        instance: DevToolsInstance,
-        prefix: string = '',
-        isLastChild: boolean = true,
-      ): void {
-        if (!instance) return;
-
-        const name =
-          (instance.kind !== VIRTUAL_INSTANCE
-            ? getDisplayNameForFiber(instance.data)
-            : instance.data.name) || 'Unknown';
-
-        const id = instance.id !== undefined ? instance.id : 'unknown';
-
-        if (name !== 'createRoot()') {
-          treeString +=
-            prefix +
-            (isLastChild ? '└── ' : '├── ') +
-            name +
-            ' (id: ' +
-            id +
-            ')\n';
-        }
-
-        const childPrefix = prefix + (isLastChild ? '    ' : '│   ');
-
-        let childCount = 0;
-        let tempChild = instance.firstChild;
-        while (tempChild !== null) {
-          childCount++;
-          tempChild = tempChild.nextSibling;
-        }
-
-        let child = instance.firstChild;
-        let currentChildIndex = 0;
-
-        while (child !== null) {
-          currentChildIndex++;
-          const isLastSibling = currentChildIndex === childCount;
-          buildTreeString(child, childPrefix, isLastSibling);
-          child = child.nextSibling;
-        }
-      }
-
-      const rootInstances: Array<DevToolsInstance> = [];
-      idToDevToolsInstanceMap.forEach(instance => {
-        if (instance.parent === null || instance.parent.parent === null) {
-          rootInstances.push(instance);
-        }
-      });
-
-      if (rootInstances.length > 0) {
-        for (let i = 0; i < rootInstances.length; i++) {
-          const isLast = i === rootInstances.length - 1;
-          buildTreeString(rootInstances[i], '', isLast);
-          if (!isLast) {
-            treeString += '\n';
-          }
-        }
-      } else {
-        treeString = 'No component tree found.';
-      }
-
-      return treeString;
-    }
-
-    internalMcpFunctions.__internal_only_getComponentTree =
-      __internal_only_getComponentTree;
-  }
-
   return {
     cleanup,
     clearErrorsAndWarnings,
@@ -8940,6 +8860,5 @@ export function attach(
     supportsTogglingSuspense,
     updateComponentFilters,
     getEnvironmentNames,
-    ...internalMcpFunctions,
   };
 }

scripts/flow/react-devtools.js

@@ -16,6 +16,5 @@ declare const __IS_FIREFOX__: boolean;
 declare const __IS_CHROME__: boolean;
 declare const __IS_EDGE__: boolean;
 declare const __IS_NATIVE__: boolean;
-declare const __IS_INTERNAL_MCP_BUILD__: boolean;
 
 declare const chrome: any;

scripts/jest/devtools/setupEnv.js

@@ -15,7 +15,6 @@ global.__IS_FIREFOX__ = false;
 global.__IS_CHROME__ = false;
 global.__IS_EDGE__ = false;
 global.__IS_NATIVE__ = false;
-global.__IS_INTERNAL_MCP_BUILD__ = false;
 
 const ReactVersionTestingAgainst = process.env.REACT_VERSION || ReactVersion;