@firsthandjs/jsx-runtime

Runtime JSX for environments where the Firsthand compiler is not configured: a REPL, a test that imports TSX directly, a tool that transpiles with jsxImportSource.

Documentation: guide · API reference · all docs

It produces real DOM through the same protocol as the compiled output — there is no second semantics and no second runtime. What it cannot do is hoist static markup into a <template>, and it cannot see an expression that a JSX call has already evaluated, so a dynamic value must be written as a thunk:

<p>{() => count.value}</p>

The compiler writes those thunks for you. Use it for production.

Full documentation: the repository README.

MIT licensed.