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babel.config.js
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babel.config.js
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module.exports = function(api) {
api.cache(!api.env('production'));
return {
presets: [
[
'@babel/preset-env',
{
targets: {
browsers: ['last 3 iOS versions', 'last 3 versions', 'ie >= 10'],
},
modules: false,
useBuiltIns: 'entry',
exclude: [
// we don't use generators or async/await by default
'transform-regenerator',
// we don't use typed arrays by default
'es6.typed.*',
// we don't use reflect by default
'es6.reflect.*',
// we don't use symbols by default
'es6.symbol',
// we don't use advanced regexps by default
'es6.regexp.*',
// we don't use advanced math by default
'es6.math.acosh',
'es6.math.asinh',
'es6.math.atanh',
'es6.math.cbrt',
'es6.math.clz32',
'es6.math.cosh',
'es6.math.expm1',
'es6.math.fround',
'es6.math.hypot',
'es6.math.imul',
'es6.math.log1p',
'es6.math.log10',
'es6.math.log2',
'es6.math.sign',
'es6.math.sinh',
'es6.math.tanh',
'es6.math.trunc',
// we don't use maps and sets by default
'es6.map',
'es6.set',
'es6.weak-map',
'es6.weak-set',
// Funky unused HTML string methods
'es6.string.anchor',
'es6.string.big',
'es6.string.blink',
'es6.string.bold',
'es6.string.code-point-at',
'es6.string.fixed',
'es6.string.fontcolor',
'es6.string.fontsize',
'es6.string.from-code-point',
'es6.string.italics',
'es6.string.iterator',
'es6.string.link',
],
},
],
],
plugins: [
// NOTE: adding helpers will reduce the filesize if you have a lot off classes,
// but it will increase the main bundle size due to core-js/library/module imports
// where babel-preset-env includes core-js/modules
// The ../library/.. versions don't pollute the global scope, this is why babel-runtime
// uses those for their helpers. But since we already have the global ones loaded,
// we don't need both.
// Until there is a fix for this (related: https://github.com/babel/babel/issues/5699)
// you need to analyze your bundle to see if enabling this gives you an advantage
// 25kb parsed / 5.9kb (gzip)
// ['@babel/plugin-transform-runtime', {
// "helpers": true,
// "corejs": 2,
// "regenerator": false
// }],
'lodash',
'@babel/plugin-syntax-dynamic-import',
'@babel/plugin-syntax-import-meta',
['@babel/plugin-proposal-class-properties', { loose: false }],
'@babel/plugin-proposal-json-strings',
['@babel/plugin-proposal-decorators', { legacy: true }],
'@babel/plugin-proposal-function-sent',
'@babel/plugin-proposal-export-namespace-from',
'@babel/plugin-proposal-numeric-separator',
'@babel/plugin-proposal-throw-expressions',
// needed to register muban-components
'@babel/plugin-transform-react-display-name',
],
};
};