TypeScript
JavaScript is also TypeScript
TypeScript Playground
declare var foobar: any;
I don't know about TypeScript, but anyway, the JavaScript world out there is coming to me with foobar".
$ npx create-react-app <my-app> --typescript
When you npm start, the server starts up, and when you edit the source, it builds and reloads on its own, convenient!
reference data
tsc: Compiler
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