Grunt Typescript is encountering difficulty locating the angular core module

Question

Why is my Grunt Typescript compiler unable to locate the angular core?

I suspect it's due to the paths, causing the compiler to not find the libraries in the node_modules directory.

Error

typescript/add.component.ts(1,25): error TS2307: Cannot find module 'angular2/core'.

Setup

Gruntfile.js Task

typescript: {
    all: {
        src: ['typescript/**/*.ts'],
        dest: 'javascript/frontend',
        options: {
            target: "es5",
            module: "system",
            moduleResolution: "node",
            emitDecoratorMetadata: true,
            experimentalDecorators: true,
            removeComments: false,
            noImplicitAny: false
        }
}

typescript/add.component.ts

import {Component} from 'angular2/core';

@Component({
    selector: 'mytest',
    template: '<h1>test</h1>'
})
export class AppComponent { }

node_modules

  • Includes angular2
  • Includes typescript

Filepaths

app -- node_modules
    -- typescript
         -- app.component.ts
    -- Gruntfile.js
    -- package.json

Used libs/frameworks/tutorials

Answer №1

Recently, I encountered the exact same issue. Upon running grunt in verbose mode, I discovered that the ts config file it generated did not utilize the moduleResolution option. Interestingly, this option was not mentioned on the official grunt-typescript page either.

In the end, I switched to using the grunt-ts package which resolved the issue perfectly. Below is the configuration I used for your reference :-)

module.exports = function(grunt) {

  grunt.initConfig({
    ts: {
      base: {
        src: ['src/**/*.ts'],
        dest: 'dist',
        options: {
          module: 'system', 
          moduleResolution: 'node',
          target: 'es5',
          experimentalDecorators: true,
          emitDecoratorMetadata: true,
          noImplicitAny: false
        }
      }
    }
  });

  grunt.loadNpmTasks('grunt-ts');


  grunt.registerTask('default', ['ts']);
};

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