webpack.config.js

var webpack = require("webpack");
const TerserJsPlugin = require("terser-webpack-plugin");
var libraryName = require("./package.json").name;
var withLocalesSuffix = "-i18n";
var fs = require("fs");
var path = require("path");

var entryPoints = {
  [libraryName]: "./src/cronstrue.ts",
  [libraryName + ".min"]: "./src/cronstrue.ts",
  [libraryName + withLocalesSuffix]: "./src/cronstrue-i18n.ts",
  [libraryName + withLocalesSuffix + ".min"]: "./src/cronstrue-i18n.ts",
};

var localeEntryPoints = {};
for (let locale of fs.readdirSync("./src/i18n/locales")) {
  const code = path.basename(locale, path.extname(locale));
  localeEntryPoints[`locales/${code}`] = "./src/i18n/locales/" + locale;
  localeEntryPoints[`locales/${code}.min`] = "./src/i18n/locales/" + locale;
}

module.exports = [
  {
    mode: "production",
    entry: entryPoints,
    output: {
      path: __dirname + "/dist",
      filename: "[name].js",
      library: libraryName,
      libraryTarget: "umd",
      umdNamedDefine: true,
      globalObject: "globalThis",
    },
    resolve: {
      extensions: [".js", ".ts"],
    },
    module: {
      rules: [
        {
          test: /\.ts$/,
          loader: "ts-loader",
        },
      ],
    },
    optimization: {
      minimize: true,
      minimizer: [
        new TerserJsPlugin({
          include: /\.min\.js$/,
        }),
      ],
    },
  },
  {
    mode: "production",
    entry: localeEntryPoints,
    output: {
      path: __dirname,
      filename: "[name].js",
      library: "[name]",
      libraryTarget: "umd",
      umdNamedDefine: true,
      globalObject: "globalThis",
    },
    resolve: {
      extensions: [".js", ".ts"],
    },
    externals: {
      cronstrue: "cronstrue",
    },
    module: {
      rules: [
        {
          test: /i18n[\/\\]locales/,
          loader: "custom-loader",
          options: {
            process: function (resourcePath, source) {
              let localeCode = resourcePath.match(/i18n[\/\\]locales[\/\\]([a-zA-Z_]+)\.ts$/)[1];
              source = `\
var exports = __webpack_exports__;
${source}
import cronstrue from \"cronstrue\";
cronstrue.locales["${localeCode}"] = new ${localeCode}();
`;
              return source;
            },
          },
        },
        {
          test: /\.ts$/,
          loader: "ts-loader",
        },
      ],
    },
    optimization: {
      minimize: true,
      minimizer: [
        new TerserJsPlugin({
          include: /\.min\.js$/,
        }),
      ],
    },
    resolveLoader: {
      alias: {
        "custom-loader": path.resolve(__dirname, "./webpack-custom-loader"),
      },
    },
  },
];