Multiple exports with the same name "default"

[jacekkarczmarczyk]

Describe the bug

Following code doesn't work with vite, it's a valid js/ts syntax and it works fine in vue cli

<script lang="ts">
export { default } from './Foo.vue';
</script>

Workaround 1:

<script lang="ts">
import Foo from './Foo.vue';

export default Foo;
</script>

Workaround 2 (plain ts file):

export { default } from './Foo.vue';

Reproduction

https://github.com/jacekkarczmarczyk/vite-exports-issue

Run yarn dev or yarn build

System Info

System:
    OS: Windows 10 10.0.19043
    CPU: (12) x64 Intel(R) Core(TM) i7-8750H CPU @ 2.20GHz
    Memory: 5.54 GB / 15.87 GB
  Binaries:
    Node: 16.11.0 - C:\Program Files\nodejs\node.EXE
    Yarn: 1.22.10 - ~\AppData\Roaming\npm\yarn.CMD
    npm: 8.0.0 - C:\Program Files\nodejs\npm.CMD
  Browsers:
    Chrome: 97.0.4692.71
    Edge: Spartan (44.19041.1266.0), Chromium (97.0.1072.76)
    Internet Explorer: 11.0.19041.1202
  npmPackages:
    @vitejs/plugin-vue: ^2.0.0 => 2.1.0
    vite: ^2.7.2 => 2.7.13

Used Package Manager

yarn

Logs

09:06:18 [vite] Internal server error: Transform failed with 1 error:
C:/cygwin64/home/PC/jacekkarczmarczyk/issues/my-vue-app/src/components/NotWorking.vue:18:7: error: Multiple exports with the same name "default"
  Plugin: vite:vue
  File: C:/cygwin64/home/PC/jacekkarczmarczyk/issues/my-vue-app/src/components/NotWorking.vue

  Multiple exports with the same name "default"
  16 |  })
  17 |  import _export_sfc from 'plugin-vue:export-helper'
  18 |  export default /*#__PURE__*/_export_sfc(_sfc_main, [['__file',"C:/cygwin64/home/PC/jacekkarczmarczyk/issues/my-vue-app/src/components/NotWorking.vue"]])
     |         ^

      at failureErrorWithLog (C:\cygwin64\home\PC\jacekkarczmarczyk\issues\my-vue-app\node_modules\esbuild\lib\main.js:1493:15)
      at C:\cygwin64\home\PC\jacekkarczmarczyk\issues\my-vue-app\node_modules\esbuild\lib\main.js:1282:29
      at C:\cygwin64\home\PC\jacekkarczmarczyk\issues\my-vue-app\node_modules\esbuild\lib\main.js:629:9
      at handleIncomingPacket (C:\cygwin64\home\PC\jacekkarczmarczyk\issues\my-vue-app\node_modules\esbuild\lib\main.js:726:9)
      at Socket.readFromStdout (C:\cygwin64\home\PC\jacekkarczmarczyk\issues\my-vue-app\node_modules\esbuild\lib\main.js:596:7)
      at Socket.emit (node:events:390:28)
      at addChunk (node:internal/streams/readable:315:12)
      at readableAddChunk (node:internal/streams/readable:289:9)
      at Socket.Readable.push (node:internal/streams/readable:228:10)
      at Pipe.onStreamRead (node:internal/stream_base_commons:199:23)

Validations

• Follow our Code of Conduct
• Read the Contributing Guidelines.
• Read the docs.
• Check that there isn't already an issue that reports the same bug to avoid creating a duplicate.
• Make sure this is a Vite issue and not a framework-specific issue. For example, if it's a Vue SFC related bug, it should likely be reported to https://github.com/vuejs/core instead.
• Check that this is a concrete bug. For Q&A open a GitHub Discussion or join our Discord Chat Server.
• The provided reproduction is a minimal reproducible example of the bug.

[jacekkarczmarczyk]

@patak-dev @OliverTsang does #6851 fixes this issue?

I don't have any errors when building with 2.9.0-beta.10 (or even in 2.8.latest), but maybe there is some other problem with this that I'm not aware of?

[bluwy]

Yeah looks like this was indeed fixed. Thanks for checking this again @jacekkarczmarczyk! I'll close this then.