Angular2 DI在Typescript。我们可以在node.js /非角度项目中使用它吗？ [英] Angular2 DI in Typescript. Can we use it in node.js / non-angular projects?

问题描述

是否将角度2依赖注入容器设计为独立使用，是否可以将其用于typescript / javascript服务器端应用程序？

我打开了一个问题10月16日（ https://github.com/angular/di.js/issues/108 ）在di项目，我猜应该把它变成v2。显然这是不可能的。什么是新的angular2 di？我可以用独立的方式使用js / es6 / ts项目吗？

解决方案

从角度2 RC.5起，DI是 @ angular / core 包的一部分。对于非角色使用，最近由Angular团队的成员Minko Gechev将其提取到 injection-js 包中。

这是一个简短的ES6，友好的例子：

  //可能不需要注入js和近期@ angular / core版本
 //如果没有使用ES5风格的`Class`帮助器
 require（'reflect-metadata'）; 
 
 const {Inject，Injector，ReflectiveInjector，OpaqueToken} = require（'@ angular / core'）; 
 //或... = require（'inject-js'）; 
 
 const bread = new OpaqueToken; 
 const cutlet = new OpaqueToken; 
 
 class三明治{
构造函数（bread，cutlet，inject）{
 const anotherBread = inject.get（'bread'）; 
 
注射器=== rootInjector; 
 bread ==='bread'; 
 anotherBread ==='bread'; 
 cutlet ==='cutlet'; 
} 
} 
 
 Sandwich.parameters = [
 new Inject（bread），
 new Inject（cutlet），
 new Inject注射器）
]; 
 
 const rootInjector = ReflectiveInjector.resolveAndCreate（[
 {provide：'bread'，useValue：'bread'}，
 {provide：bread，useValue：'bread'}， 
 {提供：cutlet，useValue：'cutlet'}，
三明治
]）; 
 
 const sandwich = rootInjector.get（Sandwich）; 
  

Was the angular2 dependency injection container designed for standalone use, and is it possible to use it for typescript/javascript server-side applications ?

I opened an issue on Oct. 16 (https://github.com/angular/di.js/issues/108) on the di project which was I guess supposed to make it into v2. Apparently this was not possible. What's up with the new angular2 di ? Can I use it in a standalone fashion with js / es6 / ts projects?

解决方案

As of Angular 2 RC.5, DI is a part of @angular/core package. For non-Angular uses, it was recently extracted into injection-js package by Minko Gechev, a member of Angular team.

Here is a short ES6, Node-friendly example:

// may not be needed for injection-js and recent @angular/core versions
// if ES5-flavoured `Class` helper isn't used
require('reflect-metadata');

const { Inject, Injector, ReflectiveInjector, OpaqueToken } = require('@angular/core');
// or ... = require('injection-js');

const bread = new OpaqueToken;
const cutlet = new OpaqueToken;

class Sandwich {
    constructor(bread, cutlet, injector) {
        const anotherBread = injector.get('bread');

        injector === rootInjector;
        bread === 'bread';
        anotherBread === 'bread';
        cutlet === 'cutlet';
    }
}

Sandwich.parameters = [
    new Inject(bread),
    new Inject(cutlet),
    new Inject(Injector)
];

const rootInjector = ReflectiveInjector.resolveAndCreate([
    { provide: 'bread', useValue: 'bread' },
    { provide: bread, useValue: 'bread' },
    { provide: cutlet, useValue: 'cutlet' },
    Sandwich
]);

const sandwich = rootInjector.get(Sandwich);

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