Support Babel 8 in babelParser (loadPartialConfigSync)
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Assessment
- Difficulty
- 2/5
- Estimated time
- 1-3 hours
- Newbie friendliness
- 78/100
- Issue type
- Bug
- Clarity
- Clearly specified
- Activity status
- Quiet
- Tech stack
- react, typescript
- Domain
- tooling
Research direction
Start at the synchronous babelParser path shown in dist/babelParser.js and inspect the loadPartialConfig call. Use the provided repro.mjs with @babel/core 8.0.1, then verify parsing succeeds with Babel 8 while retaining Babel 7 compatibility.
Written by the indexing model from the issue text.
Description
Description
react-docgen@8.0.3 cannot parse components when its @babel/core dependency is resolved to Babel 8.
babelParser calls loadPartialConfig synchronously. Starting with Babel 8, that API expects a callback; synchronous callers must use loadPartialConfigSync.
This surfaced through Storybook's react-docgen plugin when a workspace-wide override resolved Babel to 8.0.1. Storybook is currently tracking Babel 8 support and explicitly waiting for react-docgen compatibility: https://github.com/storybookjs/storybook/issues/35295
Minimal reproduction
package.json:
{
"private": true,
"type": "module",
"packageManager": "pnpm@11.13.0",
"dependencies": {
"@babel/core": "8.0.1",
"react-docgen": "8.0.3"
}
}
pnpm-workspace.yaml:
packages:
- .
overrides:
'@babel/core': 8.0.1
repro.mjs:
import { parse } from 'react-docgen';
parse('export const Button = ({ label }) => <button>{label}</button>;');
Run:
pnpm install
node repro.mjs
Actual result
Error: Starting from Babel 8.0.0, the 'loadPartialConfig' function expects a callback. If you need to call it synchronously, please use 'loadPartialConfigSync'.
at loadPartialConfig (.../@babel/core/lib/index-shared.js:2207:11)
at buildPluginList (.../react-docgen/dist/babelParser.js:34:27)
Expected result
Parsing succeeds with Babel 8, while retaining Babel 7 compatibility.
Versions
react-docgen: 8.0.3@babel/core: 8.0.1- Node.js: 24.18.0
- pnpm: 11.13.0
The likely compatibility change is to use loadPartialConfigSync for this synchronous code path; that API is also available in Babel 7.
- Dominant language
- TypeScript
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- Merged PRs (30d)
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Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
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- Open a pull request that references the issue number.
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