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docs(jsx): note that tsconfig "react-jsx" now selects the production automatic runtime #36468

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docs(jsx): note that tsconfig "react-jsx" now selects the production automatic runtime #36468

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docs(jsx): note "react-jsx" selects the production runtime; JSDoc for…
robobun Jul 30, 2026
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docs(jsx): drop source-location claim; Bun emits undefined for the js…
robobun Jul 30, 2026
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types(jsx): correct sideEffects semantics (pure annotation, not impor…
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docs(jsx): drop key-warning example and development default clause
robobun Jul 30, 2026
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drop packages/bun-types JSDoc; keep the docs-only Note
robobun Jul 30, 2026
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9 changes: 9 additions & 0 deletions docs/runtime/jsx.mdx
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Expand Up @@ -38,6 +38,15 @@ How JSX constructs are transformed into vanilla JavaScript internally. The follo
| `json<br/>{<br/> "jsx": "react-jsxdev"<br/>}<br/>` | `tsx<br/>import { jsxDEV } from "react/jsx-dev-runtime";<br/>jsxDEV(<br/> "Box",<br/> { width: 5, children: "Hello" },<br/> undefined,<br/> false,<br/> undefined,<br/> this,<br/>);<br/>`<br/><br/>The `jsxDEV` variable name is a React convention. The `DEV` suffix marks code intended for development. The development version of React is slower and includes additional validity checks & debugging tools. |
| `json<br/>{<br/> "jsx": "preserve"<br/>}<br/>` | `tsx<br/>// JSX is not transpiled<br/>// "preserve" is not supported by Bun currently<br/><Box width={5}>Hello</Box><br/>` |

<Note>
`"react-jsx"` selects the production automatic runtime (`jsx`/`jsxs` from `<source>/jsx-runtime`) and `"react-jsxdev"`
selects the development runtime (`jsxDEV` from `<source>/jsx-dev-runtime`), matching TypeScript and esbuild. Use
`"react-jsxdev"` during development if you want the `jsxDEV` entry point.

Prior to Bun 1.4, `"react-jsx"` behaved like `"react-jsxdev"` and emitted the development runtime.

</Note>

### [`jsxFactory`](https://www.typescriptlang.org/tsconfig#jsxFactory)

<Note>Only applicable when `jsx` is `react`.</Note>
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