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Improve transform-react-jsx typings #13820

merged 7 commits into from Oct 7, 2021


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@JLHwung JLHwung commented Oct 6, 2021

Q                       A
Tests Added + Pass? Yes
Documentation PR Link
Any Dependency Changes?
License MIT

This PR starts by improving typings of transform-react-jsx, the type checker catches unreachable statements in

for (const attr of path.get("attributes")) {
if (!attr.isJSXElement()) continue;
const { name } =;
if (name === "__source" || name === "__self") {
throw path.buildCodeFrameError(
`__source and __self should not be defined in props and are reserved for internal usage.`,

The guard should have been !attr.isJSXAttribute(). However, since we have already thrown selfSourceError in automatic runtime

if (found[name]) throw sourceSelfError(path, name);

and we allow multiple __self and __source in classical runtime. I think current behavior is ok so we can simply remove the unreachable statements.

This PR also exports a PluginPass type from @babel/core, which can be used by plugin authors.

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@babel-bot babel-bot commented Oct 6, 2021

Build successful! You can test your changes in the REPL here:

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@JLHwung JLHwung marked this pull request as draft Oct 6, 2021
@JLHwung JLHwung force-pushed the improve-transform-react-jsx-typings branch from db5f158 to cca951b Oct 6, 2021
@JLHwung JLHwung marked this pull request as ready for review Oct 6, 2021
packages/babel-core/src/index.ts Outdated Show resolved Hide resolved
hzoo approved these changes Oct 7, 2021
@JLHwung JLHwung merged commit c2f747c into babel:main Oct 7, 2021
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@JLHwung JLHwung deleted the improve-transform-react-jsx-typings branch Oct 7, 2021
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4 participants