fix(module-runner): resolve resolvedSources correctly (#20959)

Author: sheremet-va

packages/vite/src/module-runner/sourcemap/decoder.ts

@@ -1,6 +1,6 @@
 import type { OriginalMapping } from '@jridgewell/trace-mapping'
 import { originalPositionFor } from '@jridgewell/trace-mapping'
-import { posixResolve } from '../utils'
+import { posixDirname, posixResolve } from '../utils'
 
 interface SourceMapLike {
   version: number
@@ -20,6 +20,7 @@ export class DecodedMap {
   _decoded: undefined | number[][][]
   _decodedMemo: Stats
   url: string
+  file: string
   version: number
   names: string[] = []
   resolvedSources: string[]
@@ -34,8 +35,10 @@ export class DecodedMap {
     this._encoded = mappings || ''
     this._decodedMemo = memoizedState()
     this.url = from
+    this.file = from
+    const originDir = posixDirname(from)
     this.resolvedSources = (sources || []).map((s) =>
-      posixResolve(s || '', from),
+      posixResolve(originDir, s || ''),
     )
   }
 }

packages/vite/src/node/ssr/runtime/__tests__/fixtures/pre-source-mapped-file.js

@@ -109,4 +109,23 @@ describe('module runner initialization', async () => {
       '    at Module.throwError (<root>/fixtures/string-literal-sourcemap.ts:11:9)',
     ])
   })
+
+  it('should correctly pickup the url from sources', async ({
+    server,
+    runner,
+  }) => {
+    const mod = await runner.import('/fixtures/pre-source-mapped-file.js')
+    const error = await getError(() => mod.default())
+    // The error stack shows "transpiled-inline.ts" because it is specified in the source map's "sources" field.
+    // The file itself does not exist on the file system, but we should still respect "sources".
+    // If source maps handling breaks, the stack trace will point to "transpiled-inline.js" instead, which would be a bug.
+    expect(serializeStackDeep(server, error).slice(0, 3))
+      .toMatchInlineSnapshot(`
+      [
+        "Error: __TEST_STACK_TRANSPILED_INLINE__",
+        "    at innerTestStack (<root>/fixtures/transpiled-inline.ts:22:9)",
+        "    at Module.testStack (<root>/fixtures/transpiled-inline.ts:12:3)",
+      ]
+    `)
+  })
 })