Calling a function without specifying its type may lead to issues, especially when dealing with Angular 5 http calls

Currently, my goal is to retrieve data from an API using an interface. I have created a temporary interface as shown below:

export interface ITemp {
    id: number,
    name: string,
    age:  number
}

Furthermore, I have an HTTP service where there is a function called getHomeDetails that makes a call to the API:

import {Injectable} from '@angular/core';
import { HttpClient } from '@angular/common/http';
import { ITemp } from "../interfaces/temp";
import { Observable } from "rxjs/Observable";
import 'rxjs/Rx';

@Injectable()
export class HttpService{

    http:any;
    baseUrl: String;

    constructor(http:HttpClient){
        this.http = http;
        this.baseUrl = 'some_url';
    }

    getHomeDetails(): Observable<ITemp>  {
        return this.http.get<ITemp>(this.baseUrl); //issue arises here 
        //when hovering over get<ITemp>, I receive a "Untyped function calls may not accept type arguments" error

    }

}

I am facing an issue where the interface is not being properly defined. I am unsure of what mistake I am making. It is worth noting that the syntax used above is specific to Angular version 4.3X. The code editor tools I am utilizing are Sublime Text and Visual Studio.

Answer №1

The reason for this issue is that you have assigned the data type any to your class-level variable http:

To fix this, replace http:any; with http: HttpClient

It is generally advised to avoid using any unless absolutely necessary.

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