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babel.config.js
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babel.config.js
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module.exports = function (api) {
api.cache(true);
const presetOptions = {
useBuiltIns: 'entry',
corejs: '3',
};
const exclude = [];
const plugins = [];
if (process.env.BABEL_ENV === 'es') {
presetOptions.targets = { "esmodules": true };
} else {
presetOptions.targets = '> 0.25%, not dead';
exclude.push('node_modules/**');
plugins.push(
['@babel/plugin-proposal-object-rest-spread', { loose: true, useBuiltIns: true }]
);
}
if (process.env.NODE_ENV === 'test') {
presetOptions.targets = { node: 'current' };
delete presetOptions.modules;
plugins.push(['istanbul', {
exclude: ['test/**/*.js'],
include: ['src/**/*.js'],
}]);
}
return {
presets: [
['@babel/preset-env', presetOptions],
],
plugins,
exclude,
};
};