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fix(optimizer): transpile before calling transformGlobImport #8343



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@sapphi-red sapphi-red commented May 26, 2022


When import.meta.glob is used inside Vue SFC with TypeScript, optimizer fails with error.
Minimal reproduction (stackblitz). Run npx vite optimize to reproduce.

Before #7537, TypeScript was transpiled to JavaScript before passing to es-module-lexer.

if (contents.includes('import.meta.glob')) {
scripts[key] = {
// transformGlob already transforms to js
loader: 'js',
contents: await transformGlob(
} else {

async function transformGlob(
source: string,
importer: string,
root: string,
loader: Loader,
resolve: (url: string, importer?: string) => Promise<string | undefined>,
logger: Logger
) {
// transform the content first since es-module-lexer can't handle non-js
if (loader !== 'js') {
source = (await transform(source, { loader })).code
await init
const imports = parse(source)[0]

After #7537, the transpilation was removed.
scripts[key] = {
loader: 'js',
await transformGlobImport(
)?.s.toString() || contents

But parseImportGlob which is called from transformGlobImport assumes the code as JavaScript. So that transpilation is still needed.
try {
ast = parseExpressionAt(code, start, {
ecmaVersion: 'latest',
sourceType: 'module',
ranges: true
}) as any
} catch (e) {

Additional context

Found while testing alpha.4 with my project.馃槃

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 p3-minor-bug 馃敤 An edge case that only affects very specific usage (priority) label May 26, 2022
@sapphi-red sapphi-red marked this pull request as ready for review May 26, 2022 11:42
Comment on lines 302 to 305
// transpile because `transformGlobImport` only expects js
const transpiledContents = (
await transform(contents, { loader })
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Should we only transpile if loader !== 'js'?

@antfu antfu merged commit 1dbc7cc into vitejs:main May 27, 2022
@sapphi-red sapphi-red deleted the fix/transpile-before-transformGlobImport branch May 27, 2022 07:17
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3 participants