deno/cli/tests/046_jsx_test.tsx

declare namespace JSX {
  interface IntrinsicElements {
    [elemName: string]: any;
  }
}
const React = {
  createElement(factory: any, props: any, ...children: any[]) {
    return {factory, props, children}
  }
}
const View = () => (
  <div class="deno">land</div>
)
console.log(<View />)