静态解析符号值时遇到错误。不支持函数调用。考虑替换函数或 lambda？答案

【问题标题】：Error encountered resolving symbol values statically. Function calls are not supported. Consider replacing the function or lambda?静态解析符号值时遇到错误。不支持函数调用。考虑替换函数或 lambda？
【发布时间】：2017-09-21 14:23:38
【问题描述】：

尝试启动 npm 时出现错误：

Error encountered resolving symbol values statically. Function calls are not supported. Consider replacing the function or lambda

引用导出的函数（位置 47:19 在原始 .ts 文件中），解析符号 D:/Projects/UI3/src/app/core/core.module.ts中的CoreModule

核心是：

providers: [
    {provide: HttpService,
      useFactory: (backend: XHRBackend, options: RequestOptions) => { // Here 47 line number
        return new HttpService(backend, options);
      },
      deps: [XHRBackend, RequestOptions]},
    AuthenticationService,
    DialogsService,
    AuthenticationGuard,
    I18nService
  ]

所以，它以前工作过。

【问题讨论】：

标签： angular

【解决方案1】：

您需要像这样提取箭头函数：

export function httpServiceFactory(backend: XHRBackend, options: RequestOptions) { 
    return new HttpService(backend, options);
}

...

@NgModule({
  ...
  providers: [
    {
        provide: HttpService,
        useFactory: httpServiceFactory,
        deps: [XHRBackend, RequestOptions]
    },
    AuthenticationService,
    DialogsService,
    AuthenticationGuard,
    I18nService
  ]

另见

https://github.com/angular/angular/issues/11262

【讨论】：

谢谢！你是英雄！