类型诺言中不存在属性映射<void>

Question

In my angular 6 project am getting property map does not exist on type promise error even I included

import 'rxjs/add/operator/map';
import 'rxjs/add/operator/catch';
import 'rxjs/add/operator/toPromise';

Following is my code

 submit(): Promise<any> {
        return http.post('api/SubmitEmployee', JSON.stringify(this.formData))
            .map((response: Response) => <any>response.json())
            .toPromise()
            .catch(this.handlePromiseError)
    }

    handlePromiseError(error: Response) {
        console.log(error)
    }

After some google I found solution like below but that is also not working

import { map } from 'rxjs/operators';  

pipe(map((response: Response) => response.json()))

After including this it shows error property type does not exist on type promise Following is my custom post method

post(url: string, content: any, resolve: ResolveFunction = null, reject: RejectFunction = null) {
    this.clearCache();
    const retryFunc = _ => this.post(url, content, resolve, reject);
    return fetch(appSettings.baseApiUri + url, {
      method: 'POST',
      headers: this.getCustomHeader(),
      body: content
    })
      .then(result => {
        this.handleResponse(url, result, retryFunc, resolve, reject);
      })
      .catch(error =>
        this.debounce(_ => this.handleError(url, error, retryFunc).catch(_ => reject(error)), this.debounceTimeout)
      );
  }

Answer 1

使用from来包装http.post，例如from（http.post（）。then（）），它返回一个可观察的对象，以便您可以通过管道传输流