That's orthogonal, and in fact you probably would use TypeScript to translate JSX to JS when using this library. What this does is (a) provide a Node.js module hook to call your transpile function when it encounters TSX/JSX files, and (b) provide a Node.js module that lets you remap imports, including "react/jsx-runtime" if you want a different JSX implementation.
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That's orthogonal, and in fact you probably would use TypeScript to translate JSX to JS when using this library. What this does is (a) provide a Node.js module hook to call your transpile function when it encounters TSX/JSX files, and (b) provide a Node.js module that lets you remap imports, including "react/jsx-runtime" if you want a different JSX implementation.