What does create-react-app use the TypeScript compiler for?

Question

With the new --typescript option, Create React App generates a dependency on the typescript compiler (among several other changes). However it uses @babel/preset-typescript for compiling TypeScript. So what does it use the TypeScript compiler for? Also, what is the tsconfig.js file used for?

Some people may choose to write their react application using TypeScript(typescriptlang.org), which is essentially a superset of JavaScript. However, it still needs to be transpiled into JavaScript before running to application. tsconfig the settings which specifies the root files, and other options required to compile the application. — wentjun
– wentjun, Commented May 11, 2019 at 19:26
@wentjun, I just clarified my question. I am already using TypeScript with my React project, however I was curious where CRA uses the the typescript compiler vs the Babel TypeScript plugin. — Naresh
– Naresh, Commented May 11, 2019 at 19:32

Evgeniy Malyutin · Accepted Answer · 2019-05-11 19:58:20Z

2

@babel/plugin-transform-typescript that is used by @babel/preset-typescript doesn't make type checking, it just strips out type information which is much faster. For type checking you need to install and set up TypeScript.

https://babeljs.io/docs/en/babel-plugin-transform-typescript/

edited May 11, 2019 at 19:58

answered May 11, 2019 at 19:46

Evgeniy Malyutin

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