node-webpack-preset-babel/index.js

'use strict';

module.exports = function generateBabelPreset({supportReact, extraBabelPresets, includeNodeModules, exclude, include} = {}) {
	let excludeList = [];

	if (!includeNodeModules) {
		excludeList.push(/node_modules/)
	}

	if (exclude != null) {
		excludeList = excludeList.concat(exclude);
	}

	let resolvedExtensions = [".js"];
	let presets = ["es2015"];
	let testRegex;

	if (supportReact) {
		resolvedExtensions.push(".jsx");
		presets.push("react");
		testRegex = /\.jsx?$/;
	} else {
		testRegex = /\.js$/;
	}

	if (extraBabelPresets != null) {
		presets = presets.concat(extraBabelPresets);
	}

	return {
		module: {
			rules: [{
				test: testRegex,
				exclude: excludeList,
				include: include,
				resolve: {
					extensions: resolvedExtensions
				},
				use: [{
					loader: require.resolve("babel-loader"),
					query: {
						presets: presets.map(item => require.resolve(`babel-preset-${item}`))
					}
				}]
			}]
		}
	}
};