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Babel - .babelrc vs .babelrc.json vs babel.config.json vs babel.config.js

  • Project-wide configuration

    babel.config.json files, with the different extensions (.js, .cjs, .mjs)

  • File-relative configuration

    .babelrc.json files, with the different extensions (.babelrc, .js, .cjs, .mjs)
    package.json files with a "babel" key
    For compatibility reasons, .babelrc is an alias for .babelrc.json.

https://stackoverflow.com/questions/60288375/when-to-use-babel-config-js-and-babelrc
https://awdr74100.github.io/2020-03-16-webpack-babelloader/
https://babeljs.io/docs/en/config-files

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