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babel.config.js
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babel.config.js
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module.exports = (api) => {
const clean = (x) => x.filter(Boolean);
const env = api.env().split(',');
const isTest = env.includes('test');
const isCJS = env.includes('cjs');
const isES = env.includes('es');
const isUMD = env.includes('umd');
const isRollup = env.includes('rollup');
const isParcel = env.includes('parcel');
const disableHoisting = env.includes('disableHoisting');
const modules = isTest || isCJS ? 'commonjs' : false;
const targets = {};
if (isTest) {
targets.node = true;
} else {
targets.browsers = ['last 2 versions', 'ie >= 9'];
}
const testPlugins = [
'@babel/plugin-proposal-class-properties',
'./scripts/babel/wrap-warning-with-dev-check',
];
const buildPlugins = clean([
'@babel/plugin-proposal-class-properties',
'@babel/plugin-proposal-private-methods',
'@babel/plugin-proposal-private-property-in-object',
(isCJS || isES || isUMD || isRollup) &&
!disableHoisting &&
'@babel/plugin-transform-react-constant-elements',
'babel-plugin-transform-react-pure-class-to-function',
'./scripts/babel/wrap-warning-with-dev-check',
isRollup && 'babel-plugin-transform-react-remove-prop-types',
(isCJS || isES || isParcel) && [
'inline-replace-variables',
{
__DEV__: {
type: 'node',
replacement: "process.env.NODE_ENV === 'development'",
},
},
],
isES && [
'./scripts/babel/extension-resolver',
{
// For verification, see test/module/packages-are-es-modules.mjs
modulesToResolve: [
// InstantSearch.js/es is an ES Module, so needs complete paths,
'instantsearch.js',
// React-DOM also fails if the paths are incomplete
'react-dom',
// `use-sync-external-store` also fails if the paths are incomplete
'use-sync-external-store',
// `next` imports as peer dependencies fail if paths are incomplete
'next',
],
},
],
// this plugin is used to test if we need polyfills, not to actually insert them
// only UMD, since cjs & esm have false positives due to imports
isUMD && [
'polyfill-es-shims',
{
method: 'usage-global',
targets: {
ie: 11,
},
shouldInjectPolyfill(name, defaultShouldInject) {
const exclude = [
// false positives (we access these from objects only)
'Array.prototype.item',
'String.prototype.item',
'Array.prototype.values',
'Function.prototype.name',
// we require polyfills for this already
'Array.prototype.includes',
// false positive (babel doesn't know types)
// this is actually only called on arrays
'String.prototype.includes',
// false positive (spread)
'Object.getOwnPropertyDescriptors',
];
if (defaultShouldInject && !exclude.includes(name)) {
throw new Error(
`Usage of a builtin which isn't allowed to be polyfilled: ${name}`
);
}
return false;
},
},
],
]);
return {
presets: !isParcel
? [
'@babel/preset-typescript',
'@babel/preset-react',
[
'@babel/preset-env',
{
modules,
targets,
},
],
]
: [],
plugins: isTest ? testPlugins : buildPlugins,
overrides: [
{
test: 'packages/react-*',
plugins: [
[
'@babel/plugin-transform-runtime',
{
corejs: false,
helpers: true,
regenerator: false,
useESModules: isES || isRollup,
},
],
],
},
{
test: 'packages/instantsearch-ui-components',
plugins: [
[
'@babel/plugin-transform-runtime',
{
corejs: false,
helpers: true,
regenerator: false,
},
],
],
},
],
// jsx is transpiled, so the comment should no longer be present in the final files
shouldPrintComment: (value) => !value.startsWith('* @jsx'),
};
};