angular - 输入 'Observable<{} is not assignable to type ' Observable>'

Question

我想将我的 angular 4 迁移到 angular 5。我完成了从 angular 4 到 angular 5 的迁移，现在我的拦截器出现错误以刷新我的 token 。如果出现 401 错误，我将使用此代码拦截所有请求并刷新我的 token :

import { Observable } from 'rxjs/Observable';
import { Injectable, Injector } from '@angular/core';
import { HttpEvent, HttpInterceptor, HttpHandler, HttpRequest } from '@angular/common/http';
import { UserService } from "./user/services/user.service";
import { SpinnerService } from "angular-spinners";

@Injectable()
export class AngularInterceptor implements HttpInterceptor {
    public userService;
    public spinnerService;

    constructor(private injector: Injector) {
    }

    private applyCredentials = function (req) {
        return req.clone({
            headers: req.headers.set('Authorization', 'Bearer ' + localStorage.getItem('eb-app-token'))
        });
    };

    intercept(req: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
        this.userService = this.injector.get(UserService);
        this.spinnerService = this.injector.get(SpinnerService);

        return next.handle(this.applyCredentials(req))
            /*.do(event => {

                if (event instanceof HttpResponse) {
                    console.log(event);
                }
            })*/
            .catch((res) => {
                console.log('Token refresh');
                if (res.status === 401 || res.status === 403) {
                    return this.userService.refreshToken().first().flatMap((data: any) => {
                        console.log(data.data);
                        if (data.data !== '') {
                            localStorage.removeItem('token');
                            localStorage.setItem('token', data.data);

                            this.userService.token = localStorage.getItem('token');
                            this.userService.isAuthenticated = true;
                        } else {
                            this.userService.logOut();

                            return Observable.throw(res);
                        }

                        return next.handle(this.applyCredentials(req));
                    });
                }
                else if (res.status === 500) {
                    this.spinnerService.hide('spinner');
                    this.spinnerService.hide('spinner-search');

                    this.userService.logOut();
                }

                return Observable.throw(res);
            });
    }
}

我有这个错误:

ERROR in src/app/app.interceptor.ts(25,9): error TS2322: Type 'Observable<{} | HttpProgressEvent | HttpSentEvent | HttpHeaderResponse | HttpResponse<any> | Http...' is not assignable to type 'Observable<HttpEvent<any>>'.
  Type '{} | HttpProgressEvent | HttpSentEvent | HttpHeaderResponse | HttpResponse<any> | HttpUserEvent<a...' is not assignable to type 'HttpEvent<any>'.
    Type '{}' is not assignable to type 'HttpEvent<any>'.
      Type '{}' is not assignable to type 'HttpUserEvent<any>'.
        Property 'type' is missing in type '{}'.

我试图修改不同的东西。我读了这篇文章 Observable<{}> not assignable to type Observable<SomeType[]>但我没有看到同样的问题......

第 25 行是:

return next.handle(this.applyCredentials(req))

UPDATE

我修改了:

return next.handle(this.applyCredentials(req))

经过

return <any>next.handle(this.applyCredentials(req))

和进口:

import 'rxjs/add/operator/do';
import 'rxjs/add/operator/catch';

Answer 1

您没有将具有预期类型的​​对象发送到您的句柄函数。
您可能可以通过将其解析为 来快速修复它，例如

return next.handle(<any> this.applyCredentials(req))

但是您确实应该检查您的返回类型并确保它符合预期。

更新的答案:
问题实际上出在函数返回值上，应该是 Observable<HttpEvent<any>> .
简单的解决方法是强制转换为 any像这样
return <any> next.handle(this.applyCredentials(req))
但是不能保证它会起作用，因为它不属于正确的类。