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babel-loader.js
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babel-loader.js
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export default function babelLoader(options) {
return {
test: /\.jsx?$/,
exclude: /node_modules/,
loader: require.resolve('babel-loader'),
query: {
presets: [
[require.resolve('@babel/preset-env'), {
targets: {
browsers: [
'last 2 Chrome versions',
'last 2 Firefox versions',
(options.downlevel || options.browsers && String(options.browsers).match(/(\bie(\b|\d)|internet.explorer)/gi)) && 'ie>=9'
].filter(Boolean)
},
corejs: 2,
useBuiltIns: 'usage',
modules: false,
loose: true
}]
],
plugins: [
[require.resolve('@babel/plugin-proposal-object-rest-spread'), {
loose: true,
useBuiltIns: true
}],
[require.resolve('@babel/plugin-transform-react-jsx'), {
pragma: options.pragma || 'h'
}]
].concat(
options.coverage ? [require.resolve('babel-plugin-istanbul')] : []
)
}
};
}