Your build setup is using the classic JSX runtime that still requires a React import at the top. It doesn't look like this bug report has enough info for one of us to reproduce it.

Love it or loathe it, JSX has made a big impact on front-end engineering. Here's a code-first intro to the HTML-based JavaScript templating language.

DO keep the root control file, index.ts, as a plain TypeScript file; it is not supported as a TSX file at this time. DO Follow the pattern of React without JSX to render your root component in the ...

This script file takes care of turning the JSX into JavaScript on page load, and your React app comes to life without you having to do anything special to your development environment.

Hello, I am freshman of react，I use gulp to build web assets，I compile all jsx files with gulp-react to js like this: But now, I want to use some react component registered in npm，such as ...