How to Inject Angular2 Http service into es6/7 Class?

Since you have @Decorators enabled in Babel

…I’ll fine-tune this answer to work with your specific setup.

1. You’re missing HTTP_PROVIDERS

The HTTP_PROVIDERS constant includes a number of functions required to handle HTTP requests/responses.

import {Http, HTTP_PROVIDERS} from 'angular2/http';    

@Component({
  selector: 'login',
  providers: [ HTTP_PROVIDERS ]
})

2. You need to desugar the DI (Dependency Injection) syntax

As mentioned in @alexpods’ answer.

Remove the static typing

constructor(http) {

@Inject handles DI implicitly but is only supported in Angular2+Typescript. Since you’re using Angular2+ES6 you need to attach a static getter parameter to your class to provide the ES6-specific equivalent.

static get parameters() {
    return [[Http]];
}

3. You need to bind the Http instance to your class in the constructor

By doing this, it will become accessible in your authenticate() method.

constructor(http) {
    this.http = http;
    console.log('http', this.http);
}

---

…and the full implementation:

import {Component, Inject, View, CORE_DIRECTIVES, ViewEncapsulation} from 'angular2/angular2';
import {Http, HTTP_PROVIDERS} from 'angular2/http';

@Component({
  selector: 'login',
  // required for Http
  providers: [ HTTP_PROVIDERS ]
})
@View({
  templateUrl: './components/login/login.html',
  styleUrls: ['components/login/login.css'],
  directives: [CORE_DIRECTIVES],
  encapsulation: ViewEncapsulation.Emulated
})
export class Login {
  constructor(http) {
    // bind http to your class during construction
    //   so it's available to authenticate()
    this.http = http;
  }

  // Angular2 DI desugar'd
  static get parameters() {
    return [[Http]];
  }

  authenticate(username, password) {
    this.http.get('/login');
  }
}

Aside: I know for a fact this works because I’m using it for the <ng2-markdown> component on EvanPlaice.com.