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feat: better config __dirname support #8442

merged 1 commit into from Jun 8, 2022


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This PR changes the way to implement __dirname/__filename/import.meta.url support in config files.

Before this PR, those values were replaced. But now it is injected at each files.
This will avoid some strange errors.

I tested this with the files below.

// vite.config.js
import './dep'

console.log('__dirname', __dirname)
console.log('__filename', __filename)
console.log('import.meta.url', import.meta.url)

;(() => {
  const __dirname = 'd'
  const __filename = 'f'
  console.log(__dirname, __filename)

export default {}
// dep.js
console.log('[dep] __dirname', __dirname)
console.log('[dep] __filename', __filename)
console.log('[dep] import.meta.url', import.meta.url)

refs: #7846 (comment)

Additional context

What is the purpose of this pull request?

  • Bug fix
  • New Feature
  • Documentation update
  • Other

Before submitting the PR, please make sure you do the following

  • Read the Contributing Guidelines.
  • Read the Pull Request Guidelines and follow the Commit Convention.
  • Check that there isn't already a PR that solves the problem the same way to avoid creating a duplicate.
  • Provide a description in this PR that addresses what the PR is solving, or reference the issue that it solves (e.g. fixes #123).
  • Ideally, include relevant tests that fail without this PR but pass with it.

@sapphi-red sapphi-red added the p2-nice-to-have 🍰 Not breaking anything but nice to have (priority) label Jun 2, 2022
@@ -24,14 +24,14 @@ vite --config my-config.js

::: tip NOTE
Vite will replace `__filename`, `__dirname`, and `import.meta.url` in config files and its deps. Using these as variable names or passing as a parameter to a function with string double quote (example `console.log`) will result in an error:
Vite will inject `__filename`, `__dirname` in config files and its deps. Declaring these variables at top level will result in an error:
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@sapphi-red sapphi-red Jun 2, 2022

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In CJS, the following code fails, so it is not a special thing.

const __dirname = ''

But here it also happens with ESM. This is the reason I left this note.

Also I didn't mention import.meta.url because __vite_injected_original_import_meta_url will rarely conflict.

@patak-dev patak-dev merged commit 51e9195 into vitejs:main Jun 8, 2022
@sapphi-red sapphi-red deleted the feat/better-config-dirname branch June 8, 2022 17:13
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3 participants