Deemphasize old JSX transform

[eps1lon]

People should choose the new, automatic transform
over the old transform which required a React import.

Test plan

Applied changes to local tsc code and ran pnpm tsc test.tsx --jsx:

$ pnpm tsc test.tsx --jsx
error TS6044: Compiler option 'jsx' expects an argument.
error TS6046: Argument for '--jsx' option must be: 'preserve', 'react-native', 'react-jsx', 'react-jsxdev', 'react'.

Fixes #61585

Related:

• Update compilerOptions.jsx to reflect latest preferences TypeScript-Website#2994
• Deemphasize old JSX transform vscode#246738

[jakebailey]

I feel like this is fine, though I suspect there are other places where we order the message the other way around?

[eps1lon]

I couldn't find any when looking for --jsx and react-native.

[mrazauskas]

there are other places where we order the message the other way around

Perhaps, the schema of tsconfig.json? Hard to say if different order would be reflected by code editors.

Reference: https://github.com/SchemaStore/schemastore/blob/ac8666004983f29014f320cb82c9bbe3ec44fae4/src/schemas/json/tsconfig.json#L349-L358