webpack.base.js

const path = require("path");
module.exports = {
    output: {
        path: path.resolve("./", "lib"),
    },

    // Enable sourcemaps for debugging webpack's output.
    devtool: "source-map",

    resolve: {
        // Add '.ts' as resolvable extensions.
        extensions: [".ts", ".js", ".tsx"],
    },

    module: {
        rules: [
          { enforce: 'pre', test: /\.js$/, exclude: /node_modules/, loader: 'source-map-loader' },
          {
            test: /\.ts$/, 						  // All ts and tsx files will be process by
            loaders: ['ts-loader' ], // first ts-loader, then babel-loader
            exclude: /node_modules/                   // ignore node_modules
          },
          {
            test: /\.tsx$/, 						  // All ts and tsx files will be process by
            loaders: [ 'babel-loader', 'ts-loader' ], // first ts-loader, then babel-loader
            exclude: /node_modules/                   // ignore node_modules
          },
          {
            test: /\.jsx?$/,                          // all js and jsx files will be processed by
            loader: 'babel-loader',                   // babel-loader
            exclude: /node_modules/                  // ignore node_modules
          },
        ]
    },

    // When importing a module whose path matches one of the following, just
    // assume a corresponding global variable exists and use that instead.
    // This is important because it allows us to avoid bundling all of our
    // dependencies, which allows browsers to cache those libraries between builds.
    externals: {
    },
};