fix: append inline sourcemap to executed modules, close #342

packages/vitest/src/node/transform.ts

@@ -32,8 +32,26 @@ async function _transformRequest(ctx: Vitest, id: string) {
       result = await ctx.server.ssrTransform(result.code, result.map, id)
   }
 
+  if (result)
+    withInlineSourcemap(result)
+
   if (result?.map && process.env.NODE_V8_COVERAGE)
     ctx.visitedFilesMap.set(toFilePath(id, ctx.config.root), result.map as any)
 
+  // TODO: cache this result based on Vite's module graph
+  return result
+}
+
+let SOURCEMAPPING_URL = 'sourceMa'
+SOURCEMAPPING_URL += 'ppingURL'
+
+export async function withInlineSourcemap(result: TransformResult) {
+  const { code, map } = result
+
+  if (code.includes(`${SOURCEMAPPING_URL}=`))
+    return result
+  if (map)
+    result.code = `${code}\n\n//# ${SOURCEMAPPING_URL}=data:application/json;charset=utf-8;base64,${Buffer.from(JSON.stringify(map), 'utf-8').toString('base64')}`
+
   return result
 }