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babel.config.js
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babel.config.js
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'use strict';
// * Every now and then, we adopt best practices from CRA
// * https://tinyurl.com/yakv4ggx
// ? https://nodejs.org/en/about/releases
const NODE_LTS = 'maintained node versions';
const pkgName = require('./package.json').name;
const debug = require('debug')(`${pkgName}:babel-config`);
debug('NODE_ENV: %O', process.env.NODE_ENV);
module.exports = {
parserOpts: { strictMode: true },
plugins: [
'@babel/plugin-proposal-export-default-from',
'@babel/plugin-proposal-function-bind',
'@babel/plugin-proposal-nullish-coalescing-operator',
'@babel/plugin-transform-typescript',
// ? Interoperable named CJS imports for free
[
'transform-default-named-imports',
{
exclude: [/^next([/?#].+)?/, /^mongodb([/?#].+)?/]
}
]
],
// ? Sub-keys under the "env" config key will augment the above
// ? configuration depending on the value of NODE_ENV and friends. Default
// ? is: development
env: {
// * Used by Jest and `npm test`
test: {
sourceMaps: 'both',
presets: [
[
'@babel/preset-env',
// ! We exclude "proposal-dynamic-import" only for this package!
// TODO: ... once V8 deep bug is fixed
{ targets: { node: true } /*, exclude: ['proposal-dynamic-import']*/ }
],
['@babel/preset-typescript', { allowDeclareFields: true }]
// ? We don't care about minification
],
plugins: [
// ? Only active when testing, the plugin solves the following problem:
// ? https://stackoverflow.com/q/40771520/1367414
'explicit-exports-references'
]
},
// * Used by `npm run build`
production: {
presets: [
[
'@babel/preset-env',
{
// ? https://github.com/babel/babel-loader/issues/521#issuecomment-441466991
//modules: false,
targets: NODE_LTS
}
],
['@babel/preset-typescript', { allowDeclareFields: true }]
// ? Minification is handled by Webpack
]
},
// * Used by `npm run build-externals`
external: {
presets: [
['@babel/preset-env', { targets: { node: true } }],
['@babel/preset-typescript', { allowDeclareFields: true }]
// ? Minification is handled by Webpack
]
},
// * Used for compiling tree shakable ESM code output in ./dist/esm-shakable
'esm-shakable': {
presets: [
[
'@babel/preset-env',
{
// ? https://babeljs.io/docs/en/babel-preset-env#modules
modules: false,
targets: NODE_LTS
}
],
['@babel/preset-typescript', { allowDeclareFields: true }]
// ? Minification is handled by Webpack
],
plugins: [
// ? Ensure all local imports without extensions now end in .mjs
['add-import-extension', { extension: 'mjs' }],
// ? Fix ESM relative local imports referencing package.json
[
'transform-rename-import',
{
// ? See: https://bit.ly/38hFTa8
replacements: [
{ original: 'package', replacement: `${pkgName}/package.json` }
]
}
]
]
}
}
};
debug('exports: %O', module.exports);