'React' was used before it was defined

Question

I am working with create-react-app + typescript + eslint application and during build have such error:

Line 1:8:  \'React\' was used before it was defined  @t         


        

Answer 1

I landed on this page after I started getting issues with a Gatsby project that was using Typescript and an ESLint config that extended eslint-config-airbnb-typescript. In addition to OP's error, ESLint was also giving errors on various rules not being defined, like Definition for rule '@typescript-eslint/no-redeclare' was not found. and a few others.

The underlying problem ended up being that Gatsby was using fairly old versions of both @typescript-eslint/eslint-plugin and @typescript-eslint/parser. Forcing yarn to install only up-to-date versions solved the issue:

// package.json
"resolutions": {
    "@typescript-eslint/eslint-plugin": "^4.4.0",
    "@typescript-eslint/parser": "^4.4.0"
}