angular2：如何解决错误：（SystemJS）模块未定义？

Question

I am a new learner of angular2. We know in angular2 there is a way to reference a file by relative path which by defining moduleId : module.id in component meta data. However I tried to to by that way and always get the following error:

Error: (SystemJS) module is not defined 

I have built a plunker here: a simple angular2 app

The file structure is as below, very simple:

Content of each part is as below:

config.js:

System.config({
    //use typescript for compilation
    transpiler: 'typescript',
    //typescript compiler options
    typescriptOptions: {
        emitDecoratorMetadata: true,
        module: "commonjs"
    },
    meta: {
        'typescript': {
            "exports": "ts"
        }
    },
    paths: {
        'npm:': 'https://unpkg.com/'
    },
    //map tells the System loader where to look for things
    map: {

        'app': './app',

        '@angular/core': 'npm:@angular/core/bundles/core.umd.js',
        '@angular/common': 'npm:@angular/common/bundles/common.umd.js',
        '@angular/compiler': 'npm:@angular/compiler/bundles/compiler.umd.js',
        '@angular/platform-browser': 'npm:@angular/platform-browser/bundles/platform-browser.umd.js',
        '@angular/platform-browser-dynamic': 'npm:@angular/platform-browser-dynamic/bundles/platform-browser-dynamic.umd.js',
        '@angular/http': 'npm:@angular/http/bundles/http.umd.js',
        '@angular/router': 'npm:@angular/router/bundles/router.umd.js',
        '@angular/forms': 'npm:@angular/forms/bundles/forms.umd.js',

        '@angular/core/testing': 'npm:@angular/core/bundles/core-testing.umd.js',
        '@angular/common/testing': 'npm:@angular/common/bundles/common-testing.umd.js',
        '@angular/compiler/testing': 'npm:@angular/compiler/bundles/compiler-testing.umd.js',
        '@angular/platform-browser/testing': 'npm:@angular/platform-browser/bundles/platform-browser-testing.umd.js',
        '@angular/platform-browser-dynamic/testing': 'npm:@angular/platform-browser-dynamic/bundles/platform-browser-dynamic-testing.umd.js',
        '@angular/http/testing': 'npm:@angular/http/bundles/http-testing.umd.js',
        '@angular/router/testing': 'npm:@angular/router/bundles/router-testing.umd.js',

        'rxjs': 'npm:rxjs',
        'typescript': 'npm:typescript/lib/typescript.js'
    },
    //packages defines our app package
    packages: {
        app: {
            main: 'main.ts',
            defaultExtension: 'ts'
        },

        rxjs: {
            defaultExtension: 'js'
        }
    }
});

app.component.ts:

import { Component } from '@angular/core';

@Component({
    moduleId: module.id,
    selector: 'app',
    templateUrl: 'app.component.html'
})
export class AppComponent {

}

For other file, you can refer to the plunker. I have set module: "commonjs" in typescriptOptions. Is there anything wrong with my codes?

Answer 1

对于systemjs，在这里我应该使用__moduleName而不是module.id

Answer 2

It's work for me Angular@4.xx, Typescript@2.xx, SystemJS@0.20.12

declare var __moduleName: string;
import { Component } from '@angular/core';

@Component({
    moduleId: __moduleName,
    selector: 'app',
    templateUrl: 'app.component.html'
})
export class AppComponent {

}

Answer 3

If you want to use module.id you can install the @types/node package as a dev dependency.

This will recognise module as a type.

https://www.npmjs.com/package/@types/node