Angular 2 is unable to locate the module '@angular/core' and is throwing an error

After following the Angular2 quick start guide to set up my project, I encountered a persistent error when running the "tsc -w" command in the command line:

app/components/company/company.ts(1,36): error TS2307: Cannot find module '@angular/core'.
app/components/company/company.ts(5,22): error TS2307: Cannot find module '@angular/router'.
app/components/mission/mission.ts(1,36): error TS2307: Cannot find module '@angular/core'.
app/components/mission/mission.ts(3,22): error TS2307: Cannot find module '@angular/router'.

Despite these errors, the compilation is successful and the application functions properly. However, the constant warnings can be distracting.

The setup includes Angular2 rc1, TypeScript 1.8.10, and WebStorm EAP, although I am not using WebStorm's TypeScript compilation system but relying on an open terminal with the "tsc -w" command instead.

I have searched for solutions on Stack Overflow without finding a resolution that resolves this issue for me.

Update

Here is an excerpt from my tsconfig.json file:

{
  "compilerOptions": {
    "target": "es5",
    "sourceMap": true,
    "experimentalDecorators": true,
    "emitDecoratorMetadata": true,
    "module": "system",
    "noImplicitAny": false,
    "outDir": "js",
    "rootDir": "app"
  },
  "exclude": [
    "node_modules",
    "typings/main",
    "typings/main.d.ts"
  ]
}

Answer №1

It is recommended to specify the moduleResolution attribute as node:

{
  "compilerOptions": {
    "target": "es5",
    "sourceMap": true,
    "experimentalDecorators": true,
    "emitDecoratorMetadata": true,
    "module": "system",
    "moduleResolution": "node", // <-----
    "noImplicitAny": false,
    "outDir": "js",
    "rootDir": "app"
  },
  "exclude": [
    "node_modules",
    "typings/main",
    "typings/main.d.ts"
  ]
}

Answer №2

To start, the first step is to incorporate typings at a global level by following the instructions below.

npm install -g typings

Next, generate a typings.json file using the command provided.

typings init

Add the following code snippet to the typings.json file:

{
  "name": "ng2-application",
  "globalDependencies": {
    "core-js": "registry:dt/core-js#0.0.0+20160725163759",
    "jasmine": "registry:dt/jasmine#2.2.0+20160621224255",
    "node": "registry:dt/node#6.0.0+20160909174046"
  }
}

Now, update the tsconfig.json file with the specified code block:

 "compilerOptions": {
        "moduleResolution": "node"
       }

By following these steps, you will be able to access definitions when pressing F12 in your IDE.

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