[@vitejs/plugin-legacy] Cannot read property 'fileName' of undefined with ?worker&inline

[tjk]

Describe the bug

Please see log output below. Is this just undocumented but expected?

System Info

npx: installed 1 in 0.653s

  System:
    OS: Linux 5.10 Ubuntu 20.04.2 LTS (Focal Fossa)
    CPU: (16) x64 11th Gen Intel(R) Core(TM) i9-11900KF @ 3.50GHz
    Memory: 8.46 GB / 12.38 GB
    Container: Yes
    Shell: 5.0.17 - /bin/bash
  Binaries:
    Node: 12.18.1 - ~/.asdf/installs/nodejs/12.18.1/bin/node
    Yarn: 1.22.5 - ~/.asdf/shims/yarn
    npm: 6.14.5 - ~/.asdf/installs/nodejs/12.18.1/bin/npm
  npmPackages:
    @vitejs/plugin-vue: ^1.2.3 => 1.2.3
    vite: ^2.3.6 => 2.3.6

Used package manager: yarn

Logs

[0] ✓ 2794 modules transformed.
[0] [vite:worker] Cannot read property 'fileName' of undefined
[0] file: /frontend/node_modules/monaco-editor/esm/vs/editor/editor.worker.js?worker&inline
[0] error during build:
[0] TypeError: Cannot read property 'fileName' of undefined
[0]     at transformIndexHtml (/frontend/node_modules/@vitejs/plugin-legacy/index.js:305:17)
[0]     at applyHtmlTransforms (/frontend/node_modules/vite/dist/node/chunks/dep-cb562f8f.js:24645:27)
[0]     at Object.generateBundle (/frontend/node_modules/vite/dist/node/chunks/dep-cb562f8f.js:24605:32)
[0]     at /frontend/node_modules/rollup/dist/shared/rollup.js:19044:25

[github-actions]

Hello @tjk. Please provide a online reproduction by codesandbox or a minimal GitHub repository. Issues labeled by need reproduction will be closed if no activities in 3 days.

[tjk]

Here is the repro: https://github.com/tjk/vite-legacy-issue

[github-actions]

This issue gets locked because it has been closed for more than 14 days.