TypeScript error in Angular2 code: Cannot find name 'module'

问题:

I have defined the following Angular2 component:

import {Component} from 'angular2/core';  @Component({   selector: 'my-app',   moduleId: module.id,   templateUrl: './app.component.html' }) export class AppComponent { } 

When I try to compile this, I get the following error on line 5:

src/app/app.component.ts(5,13): error TS2304: Cannot find name 'module'. 

I believe module.id is referring to the CommonJS module variable (see here). I have specified the CommonJS module system in tsconfig.json:

{   "compilerOptions": {     "target": "es5",     "module": "commonjs",     "declaration": false,     "removeComments": true,     "noLib": false,     "emitDecoratorMetadata": true,     "experimentalDecorators": true,     "sourceMap": true,     "pretty": true,     "allowUnreachableCode": false,     "allowUnusedLabels": false,     "noImplicitAny": true,     "noImplicitReturns": true,     "noImplicitUseStrict": false,     "noFallthroughCasesInSwitch": true   },   "exclude": [     "node_modules",     "dist",     "typings/browser.d.ts",     "typings/browser",     "src"   ],   "compileOnSave": false } 

How can I correct the TypeScript error?

回答1:

Update

If you use Typescript 2^ just use the following command:

npm i @types/node --save-dev 

(instead of --save-dev you can just use shortcut -D)

or install it globally:

npm i @types/node --global 

You can also specify typeRoots or types in your tsconfig.json if you want but by default all visible “@types” packages are included in your compilation.

Old version

You need to install node ambientDependencies. Typings.json

"ambientDependencies": {     "node": "github:DefinitelyTyped/DefinitelyTyped/node/node.d.ts#138ad74b9e8e6c08af7633964962835add4c91e2", 

Another way can use typings manager to install node definition file globally:

typings install dt~node --global --save-dev 

Then your typings.json file will look like this:

"globalDependencies": {   "node": "registry:dt/node#6.0.0+20160608110640" } 

回答2:

For those looking to do this with Typescript 2.x and @types, here's what you need to do:

1. npm install -D @types/node
2. Include types: ["node"] under compilerOptions in your tsconfig.json file.

I had a tough time finding the instructions for step 2.

Reference: Typescript issue 9184

Edit:

You could also do:

2. Include "typeRoots": [ "node_modules/@types" ] under compilerOptions in your tsconfig.json file. This is instead of the types property and has the benefit of automatically including any @types you install with npm.

For example:

{   "compilerOptions": {     "typeRoots": [       "node_modules/@types"     ]   } } 

[Second edit] Apparently, with the latest typescript, you only need typeRoots or types if tsconfig.json is not in the root of your project or your types are not stored in node_modules/@types.

回答3:

Instead of "ambient" try "global" by Typings 1.0

typings install dt~node --global --save 

回答4:

I hit this error when porting my @angular/angular2 Quickstart project into a new angular cli auto-generated project.

It seems that moduleId: module.id isn't needed anymore.

This is the latest auto-generated component:

import { Component } from '@angular/core';  @Component({   selector: 'app-root',   templateUrl: './app.component.html',   styleUrls: ['./app.component.css'] }) export class AppComponent {   title = 'app works!'; } 

Removing all occurances resolved my errors.

回答5:

Two key points:

1. Register typings by running typings install dt~node --global --save. So you'll get the following section in typings.json:

   "globalDependencies": {     "node": "registry:dt/node#6.0.0+20160608110640" } 

2. Add reference to the new module. Two ways:

   • Directly add a reference to a dependency in your TS

     ///

   • Add typings/index.d.ts in the files section of the tsconfig.json

     {     "files": [         "typings/index.d.ts"     ] } 

See more here.

回答6:

I use VS 2015, and had same issues, but I have resolved using:

1. add the typings.json file from the angular.io website (2.0.0 final at the moment) and the run:

   typings install // don't forget to install typings globally 

then

npm install -D @types/node --save 

in the package.json I have

"devDependencies": { "@types/node": "6.0.40", ... 

2. in the typings.json I have the following configuration

   { "compilerOptions": {     "target": "es5",     "module":"commonjs",     "moduleResolution": "node",     "sourceMap": true,     "emitDecoratorMetadata": true,     "experimentalDecorators": true,     "removeComments": true,     "noImplicitAny": true,     "suppressImplicitAnyIndexErrors": true,     "allowSyntheticDefaultImports": true,     "types": [] }, "exclude": [     "node_modules",     "app-dist" ] } 

I had to add the types as an empty array

3. check for duplicates, and if moduleId: module.id is still highlighted

p.s. to me personally is a strange issue, because as soon as you exclude typings inside typings.json, you have immediately highlighted 'module', but if you let it in, you have lot's of duplicates. Don't know who to blame, me, typescript or visual studio :)

回答7:

This is what I did that worked for me on Eclipse(Webclipse)/Windows.

Step 1:

Terminal

$ npm install @types/node --global --save 

Step 2:

tsconfig.json

{   "compilerOptions": {     ...,     "types": ["node"]   } } 

In addition, I had the following dependencies in my package.json, so I was using typescript 2.

  "devDependencies": {     ...     "typescript": "~2.0.10",     "@types/node": "^6.0.46",     ...   }, 

回答8:

I installed in the project, and worked well

npm install @types/node --save 

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