Method evaluateCompilationResult

index.js:618–688

* Once webpack is done with compiling the template into a NodeJS code this function * evaluates it to generate the html result * * The evaluateCompilationResult is only a class function to allow spying during testing. * Please change that in a further refactoring * * @param {string

(source, publicPath, templateFilename)

   * @returns {Promise<string | (() => string | Promise<string>)>}
   */
  evaluateCompilationResult(source, publicPath, templateFilename) {
    if (!source) {
      return Promise.reject(
        new Error("The child compilation didn't provide a result"),
      );
    }

    // The LibraryTemplatePlugin stores the template result in a local variable.
    // By adding it to the end the value gets extracted during evaluation
    if (source.indexOf("HTML_WEBPACK_PLUGIN_RESULT") >= 0) {
      source += ";\nHTML_WEBPACK_PLUGIN_RESULT";
    }

    const templateWithoutLoaders = templateFilename
      .replace(/^.+!/, "")
      .replace(/\?.+$/, "");
    const globalClone = Object.create(
      Object.getPrototypeOf(global),
      Object.getOwnPropertyDescriptors(global),
    );
    // Presence of `eval` and `Function` breaks template's explicit `eval` call
    // Ref: https://github.com/nodejs/help/issues/2880
    delete globalClone.eval;
    delete globalClone.Function;
    // Not using `...global` as it throws when localStorage is not explicitly enabled in Node 25+
    // Provide a CommonJS-style `module`/`exports` pair so templates compiled as CommonJS
    // (e.g. Rspack's child compilation output, which wraps the result in `module.exports = ...`)
    // can assign to them instead of failing with `module is not defined`.
    const sandboxModule = { exports: {} };
    const vmContext = vm.createContext(
      Object.assign(globalClone, {
        HTML_WEBPACK_PLUGIN: true,
        // Copying nonstandard globals like `require` explicitly as they may be absent from `global`
        require: require,
        module: sandboxModule,
        exports: sandboxModule.exports,
        htmlWebpackPluginPublicPath: publicPath,
        __filename: templateWithoutLoaders,
        __dirname: path.dirname(templateWithoutLoaders),
      }),
    );

    const vmScript = new vm.Script(source, {
      filename: templateWithoutLoaders,
    });

    // Evaluate code and cast to string
    let newSource;

    try {
      newSource = vmScript.runInContext(vmContext);
    } catch (e) {
      return Promise.reject(e);
    }

    if (
      typeof newSource === "object" &&
      newSource.__esModule &&