How to use the @glimmer/program.WriteOnlyProgram function in @glimmer/program

renderTemplate(template: string, context: Dict, element: HTMLElement): RenderResult {
    let macros = new TestMacros();
    let delegate: BundlingDelegate = new BundlingDelegate(this.components, this.modules, this.compileTimeModules, specifier => {
      return compiler.compileSpecifier(specifier);
    });
    let program = new WriteOnlyProgram(new DebugConstants());
    let compiler = new BundleCompiler(delegate, { macros, program });

    let spec = specifierFor('ui/components/main', 'default');
    compiler.add(spec, template);

    let { components, modules, compileTimeModules } = this;
    Object.keys(components).forEach(key => {
      assert(key.indexOf('ui/components') !== -1, `Expected component key to start with ui/components, got ${key}.`);

      let component = components[key];
      let spec = specifierFor(key, 'default');

      let block;
      let symbolTable;

      if (component.type === "Curly" || component.type === "Dynamic") {