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This line appears in the default Expo babel.config.js, but I can't find any reference anywhere to what it does. Is there anyone who knows what this does?
module.exports = function(api) {
api.cache(true);
return {
presets: ['babel-preset-expo'],
};
};
882
Babel has two parallel config file formats which can be used together, or independently. . babelrc would be useful if you want to run certain transformations / plugins on a subset of files /directories. Maybe you have 3rd party libraries that you don't want to be transformed/changed by babel.
babelrc file is your local configuration for your code in your project. Generally you would put it in the root of your application repo. It will affect all files that Babel processes that are in the same directory or in sibling directories of the . babelrc .
Where can I find the babel configuration of a non ejected application made with create-react-app ? It's in the Webpack config of the react-scripts/config directory.
By default, Babel will evaluate configuration each time it processes a new file. It is possible to optimize the build process performance by caching config function execution result. api.cache(true) does exactly that. When the cache is enabled this way, config function will be called only once.
Here is a link for a more detailed explanation of Babel configuration caching: https://babeljs.io/docs/en/config-files#apicache
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