Communication Blog Examples

@@ -177,10 +177,11 @@ function mapSourcePosition(position: OriginalMapping) {
  if (!sourceMap) {
  // Call the (overridable) retrieveSourceMap function to get the source map.
  const urlAndMap = retrieveSourceMap(position.source)
- if (urlAndMap && urlAndMap.map) {
+ const map = urlAndMap && urlAndMap.map
+ if (map && !(typeof map === 'object' && 'mappings' in map && map.mappings === '')) {
  sourceMap = sourceMapCache[position.source] = {
  url: urlAndMap.url,
- map: new TraceMap(urlAndMap.map),
+ map: new TraceMap(map),
  }
 
  // Load all sources stored inline with the source map into the file cache

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@@ -0,0 +1,2 @@
+// eslint-disable-next-line no-console
+console.log(new Error('[ok]').stack)

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@@ -0,0 +1,14 @@
+import { defineConfig } from 'vite'
+
+export default defineConfig({
+ plugins: [
+ {
+ name: 'repro',
+ transform(code, id) {
+ if (id.endsWith('/empty-mappings/main.ts')) {
+ return { code, map: { mappings: '' } }
+ }
+ },
+ },
+ ],
+})

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@@ -74,3 +74,9 @@ it('buildStart with all ssr', async () => {
  )
  await result.viteNode.waitForStdout('["buildStart:in","buildStart:out"]')
 })
+
+it('empty mappings', async () => {
+ const root = resolve(__dirname, '../src/empty-mappings')
+ const result = await runViteNodeCli('--root', root, resolve(root, 'main.ts'))
+ await result.viteNode.waitForStdout('[ok]')
+})