code: function generateModuleFile(componentsMetadata, demoAppDocsModuleDir) {
    const imports = componentsMetadata
      .map(componentMetadata => `import { ${componentMetadata.name} } from './${componentMetadata.file}';`)
      .join('\n');
  
    const components = componentsMetadata
      .map(componentMetadata => `    ${componentMetadata.name},`)
      .join('\n');
  
    const routes = componentsMetadata
      .map(componentMetadata => `    { path: 'docs/${componentMetadata.route}', component: ${componentMetadata.name} },`)
      .join('\n');
  
    const moduleTsFileContents = `import { NgModule } from '@angular/core';
  import { RouterModule, Routes } from '@angular/router';
  
  ${imports}
  
  const routes: Routes = [
      { path: 'docs', component: IndexComponent }, // always start with index
  ${routes}
  ];
  
  @NgModule({
    imports: [
      RouterModule.forChild(routes),
    ],
    declarations: [
  ${components}
    ],
    exports: [
  ${components}
    ]
  })
  export class DocsModule { }
  `;
  
    const moduleTsFile = path.join(demoAppDocsModuleDir, 'docs.module.ts');
    fs.writeFileSync(moduleTsFile, moduleTsFileContents, { encoding: 'utf8' });
  }
docs: Generate module file based on metadata from generated components