wordpress-webpack-workflow/webpack/babel.config.js

Modern WebPack workflow for WordPress front-end development and testing (plugins & themes) with handy tools included.

/**
 * BabelJS config file
 * as configured in package.json under babel.extends
 *
 * @docs Babel Webpack loader: https://webpack.js.org/loaders/babel-loader/
 * @since 1.0.0
 */
module.exports = api => {
    return {
        plugins: [],
        presets: [
            [ "@babel/preset-env",
                {
                    corejs: "3.1.3",
                    useBuiltIns: "entry",
                    // caller.target will be the same as the target option from webpack
                    targets: api.caller( caller => caller && caller.target === "node" )
                                 ? { node: "current" }
                                 : { chrome: "58", ie: "11" }
                }
            ]
        ]
    }
}