Add support for ignore-listing sources in index maps

packages/next/src/server/patch-error-inspect.ts

@@ -9,17 +9,37 @@ import { getOriginalCodeFrame } from '../client/components/react-dev-overlay/ser
 import { workUnitAsyncStorage } from './app-render/work-unit-async-storage.external'
 import { dim } from '../lib/picocolors'
 
+/**
+ * https://tc39.es/source-map/#index-map
+ */
+interface IndexSourceMapSection {
+  offset: {
+    line: number
+    column: number
+  }
+  map: ModernRawSourceMap
+}
+
+// TODO(veil): Upstream types
+interface IndexSourceMap {
+  version: number
+  file: string
+  sections: IndexSourceMapSection[]
+}
+
 interface ModernRawSourceMap extends SourceMapPayload {
   ignoreList?: number[]
 }
 
+type ModernSourceMapPayload = ModernRawSourceMap | IndexSourceMap
+
 interface IgnoreableStackFrame extends StackFrame {
   ignored: boolean
 }
 
 type SourceMapCache = Map<
   string,
-  { map: SyncSourceMapConsumer; raw: ModernRawSourceMap }
+  { map: SyncSourceMapConsumer; payload: ModernSourceMapPayload }
 >
 
 // TODO: Implement for Edge runtime
@@ -77,6 +97,37 @@ function shouldIgnoreListByDefault(file: string): boolean {
   return file.startsWith('node:')
 }
 
+/**
+ * Finds the sourcemap payload applicable to a given frame.
+ * Equal to the input unless an Index Source Map is used.
+ */
+function findApplicableSourceMapPayload(
+  frame: StackFrame,
+  payload: ModernSourceMapPayload
+): ModernRawSourceMap | undefined {
+  if ('sections' in payload) {
+    const frameLine = frame.lineNumber ?? 0
+    const frameColumn = frame.column ?? 0
+    // Sections must not overlap and must be sorted: https://tc39.es/source-map/#section-object
+    // Therefore the last section that has an offset less than or equal to the frame is the applicable one.
+    // TODO(veil): Binary search
+    let section: IndexSourceMapSection | undefined = payload.sections[0]
+    for (
+      let i = 0;
+      i < payload.sections.length &&
+      payload.sections[i].offset.line <= frameLine &&
+      payload.sections[i].offset.column <= frameColumn;
+      i++
+    ) {
+      section = payload.sections[i]
+    }
+
+    return section === undefined ? undefined : section.map
+  } else {
+    return payload
+  }
+}
+
 function getSourcemappedFrameIfPossible(
   frame: StackFrame,
   sourceMapCache: SourceMapCache
@@ -91,24 +142,24 @@ function getSourcemappedFrameIfPossible(
 
   const sourceMapCacheEntry = sourceMapCache.get(frame.file)
   let sourceMap: SyncSourceMapConsumer
-  let rawSourceMap: ModernRawSourceMap
+  let sourceMapPayload: ModernSourceMapPayload
   if (sourceMapCacheEntry === undefined) {
     const moduleSourceMap = findSourceMap(frame.file)
     if (moduleSourceMap === undefined) {
       return null
     }
-    rawSourceMap = moduleSourceMap.payload
+    sourceMapPayload = moduleSourceMap.payload
     sourceMap = new SyncSourceMapConsumer(
       // @ts-expect-error -- Module.SourceMap['version'] is number but SyncSourceMapConsumer wants a string
-      rawSourceMap
+      sourceMapPayload
     )
     sourceMapCache.set(frame.file, {
       map: sourceMap,
-      raw: rawSourceMap,
+      payload: sourceMapPayload,
     })
   } else {
     sourceMap = sourceMapCacheEntry.map
-    rawSourceMap = sourceMapCacheEntry.raw
+    sourceMapPayload = sourceMapCacheEntry.payload
   }
 
   const sourcePosition = sourceMap.originalPositionFor({
@@ -126,9 +177,21 @@ function getSourcemappedFrameIfPossible(
       /* returnNullOnMissing */ true
     ) ?? null
 
-  // TODO: O(n^2). Consider moving `ignoreList` into a Set
-  const sourceIndex = rawSourceMap.sources.indexOf(sourcePosition.source)
-  const ignored = rawSourceMap.ignoreList?.includes(sourceIndex) ?? false
+  const applicableSourceMap = findApplicableSourceMapPayload(
+    frame,
+    sourceMapPayload
+  )
+  // TODO(veil): Upstream a method to sourcemap consumer that immediately says if a frame is ignored or not.
+  let ignored = false
+  if (applicableSourceMap === undefined) {
+    console.error('No applicable source map found in sections for frame', frame)
+  } else {
+    // TODO: O(n^2). Consider moving `ignoreList` into a Set
+    const sourceIndex = applicableSourceMap.sources.indexOf(
+      sourcePosition.source
+    )
+    ignored = applicableSourceMap.ignoreList?.includes(sourceIndex) ?? false
+  }
 
   const originalFrame: IgnoreableStackFrame = {
     methodName:

test/development/app-dir/dynamic-io-dev-errors/dynamic-io-dev-errors.test.ts

@@ -67,12 +67,12 @@ describe('Dynamic IO Dev Errors', () => {
         `We don't have the exact line number added to error messages yet but you can see which component in the stack below. ` +
         `See more info: https://nextjs.org/docs/messages/next-prerender-missing-suspense` +
         '\n    at Page [Server] (<anonymous>)' +
-        // TODO(veil): Should be ignore-listed. Feel free to adjust the component name since it's Next.js internals.
-        '\n    at parallelRouterKey (' +
         (isTurbopack
-          ? 'node_modules'
-          : // TODO(veil): Why is this not pointing to n_m in Webpack?
-            '../')
+          ? // TODO(Veil): Should be sourcemapped
+            '\n    at InnerScrollAndFocusHandler (.next/'
+          : // TODO(veil): Should be ignore-listed
+            // TODO(veil): Why is this not pointing to n_m in Webpack?
+            '\n    at parallelRouterKey (..')
     )
 
     const description = await getRedboxDescription(browser)