feat: add support for injecting debug IDs

packages/vite/src/node/plugins/importAnalysisBuild.ts

@@ -697,6 +697,8 @@ export function buildImportAnalysisPlugin(config: ResolvedConfig): Plugin {
                 chunk.map as RawSourceMap,
               ]) as SourceMap
               map.toUrl = () => genSourceMapUrl(map)
+
+              const originalDebugId = chunk.map.debugId
               chunk.map = map
 
               if (buildSourcemap === 'inline') {
@@ -706,6 +708,9 @@ export function buildImportAnalysisPlugin(config: ResolvedConfig): Plugin {
                 )
                 chunk.code += `\n//# sourceMappingURL=${genSourceMapUrl(map)}`
               } else {
+                if (originalDebugId) {
+                  map.debugId = originalDebugId
+                }
                 const mapAsset = bundle[chunk.fileName + '.map']
                 if (mapAsset && mapAsset.type === 'asset') {
                   mapAsset.source = map.toString()

playground/js-sourcemap/__tests__/js-sourcemap.spec.ts

@@ -9,7 +9,9 @@ import {
   findAssetFile,
   formatSourcemapForSnapshot,
   isBuild,
+  listAssets,
   page,
+  readFile,
   serverLogs,
 } from '~utils'
 
@@ -139,6 +141,7 @@ describe.runIf(isBuild)('build tests', () => {
     const map = findAssetFile(/after-preload-dynamic-[-\w]{8}\.js\.map/)
     expect(formatSourcemapForSnapshot(JSON.parse(map))).toMatchInlineSnapshot(`
       {
+        "debugId": "c3dabf82-954a-4c41-ba03-767350e274b5",
         "ignoreList": [],
         "mappings": ";+8BAAA,OAAO,2BAAuB,0BAE9B,QAAQ,IAAI,uBAAuB",
         "sources": [
@@ -177,6 +180,7 @@ describe.runIf(isBuild)('build tests', () => {
     const map = findAssetFile(/with-define-object.*\.js\.map/)
     expect(formatSourcemapForSnapshot(JSON.parse(map))).toMatchInlineSnapshot(`
       {
+        "debugId": "bd3962fc-edb5-4a6d-a5da-f27a1e5f3268",
         "mappings": "qBAEA,SAASA,GAAO,CACJC,EAAA,CACZ,CAEA,SAASA,GAAY,CAEX,QAAA,MAAM,qBAAsBC,CAAkB,CACxD,CAEAF,EAAK",
         "sources": [
           "../../with-define-object.ts",
@@ -207,4 +211,34 @@ describe.runIf(isBuild)('build tests', () => {
       cwd: fileURLToPath(new URL('..', import.meta.url)),
     })
   })
+
+  test('source and sourcemap contain matching debug IDs', () => {
+    function getDebugIdFromString(input: string): string | undefined {
+      const match = input.match(/\/\/# debugId=([a-fA-F0-9-]+)/)
+      return match ? match[1] : undefined
+    }
+
+    const assets = listAssets().map((asset) => `dist/assets/${asset}`)
+    const jsAssets = assets.filter((asset) => asset.endsWith('.js'))
+
+    for (const jsAsset of jsAssets) {
+      const jsContent = readFile(jsAsset)
+      const sourceDebugId = getDebugIdFromString(jsContent)
+      expect(
+        sourceDebugId,
+        `Asset '${jsAsset}' did not contain a debug ID`,
+      ).toBeDefined()
+
+      const mapFile = jsAsset + '.map'
+      const mapContent = readFile(mapFile)
+
+      const mapObj = JSON.parse(mapContent)
+      const mapDebugId = mapObj.debugId
+
+      expect(
+        sourceDebugId,
+        'Debug ID in source didnt match debug ID in sourcemap',
+      ).toEqual(mapDebugId)
+    }
+  })
 })

playground/js-sourcemap/vite.config.js

@@ -30,6 +30,7 @@ export default defineConfig({
             return '#!/usr/bin/env node'
           }
         },
+        sourcemapDebugIds: true,
       },
     },
   },