[英]TypeScript 3.1.6 Angular 7 Rxjs6 Using catchError shows error in editor but the code runs correctly
I am trying to return a custom error from a data service in the event of and error. 如果出现and错误,我试图从数据服务返回自定义错误。
public getRoles(): Observable<Array<Role> | CustomError> {
return this.http.get(this.urlService.getRoles)
.pipe(
map((res: any) => {
let roles = new Array<Role>();
res.Result.forEach(item => {
roles.push(new Role().fromItem(item));
});
return roles;
}
),
catchError(err => {
let customError = new CustomError();
customError.errorNumber = err.status;
customError.message = err.message;
return throwError(customError);
})
);
}
The code above acutally runs as i expect it should, but the text editor indicates the following error: 上面的代码以我期望的方式自动运行,但是文本编辑器指示以下错误:
(TS) Type 'Observable<{} | (TS)类型“可观察<{} | Role[]>' is not assignable to type 'ObservableRole[] |
Role []>'不能分配给'ObservableRole [] |类型。 CustomError>'.
CustomError>。
Type '{} | 输入'{} | Role[]' is not assignable to type 'Role[] |
Role []'不可分配给'Role [] |类型。 CustomError'.
CustomError”。
Type '{}' is not assignable to type 'Role[] | 类型“ {}”不可分配给类型“角色[] | CustomError'.
CustomError”。
Type '{}' is not assignable to type 'CustomError'. 类型“ {}”不可分配给类型“ CustomError”。
Property 'errorNumber' is missing in type '{}' 类型“ {}”中缺少属性“ errorNumber”
Can anyone tell me what I need to do to resolve the problem? 谁能告诉我解决该问题我需要做什么?
It turns out that this is not the only place in the code where I am having an issue with catchError. 事实证明,这不是代码中我遇到catchError问题的唯一地方。 I have a simple interceptor that will log http errors to the console.
我有一个简单的拦截器,它将HTTP错误记录到控制台。 (I was experimenting on how to use interceptors).
(我正在尝试如何使用拦截器)。
public intercept(req: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
console.log(`ErrorInterceptor - ${req.url}`);
return next.handle(req)
.pipe(catchError(err => {
console.log(err);
return throwError(err);
}));
}
With this block of code I am getting a very similar set of messages. 通过这段代码,我得到了一组非常相似的消息。 Am I using catchError and throwError correctly?
我是否正确使用catchError和throwError?
My be, you need to import the throwError class? 是的,您需要导入throwError类吗? :
:
import {Observable, throwError} from 'rxjs';
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