Angular 2: A guide to setting up `--module system --experimentalDecorators` flags in your project

I am encountering an issue while compiling my TypeScript file:

app/app.component.ts

import {Component} from 'angular2/core';

@Component({
    selector: 'my-app',
    template: '<h1>Messenger</h1>'
})
export class AppComponent { }

The TypeScript Compiler is generating the following errors:

Error:(1, 1) TS1148: Cannot compile modules unless the '--module' flag is provided.
Error:(1, 25) TS2307: Cannot find module 'angular2/core'.
Error:(7, 14) TS1219: Experimental support for decorators is a feature that is subject to change in a future release. Specify '--experimentalDecorators' to remove this warning.

Even after specifying flags in tsconfig.json, the issue persists.

tsconfig.json

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

My project structure:

.
├── app
├── node_modules
├── typings
├── application.js
├── messages.js
├── package.json
├── tsconfig.json
└── typings.json

I'm using RubyMine 8 IDE.

Could you please guide me on what I might be doing wrong? Is there an alternative way to set these flags?

Answer №1

If you are utilizing the integrated TypeScript compiler, navigate to

File > Preferences > Languages & Frameworks > TypeScript

You have the option to select the set options manually radio button, and input the arguments in the Command line options text box. Check out the list of available arguments for reference.

https://i.sstatic.net/HxM4F.png

This is how to specify command line arguments.

Using tsconfig.json has been effective for me without needing to provide any specific command line arguments.

Answer №2

It appears that there are two errors in the initial line of your app.component.ts file, unless I am mistaken.

import {Component} from 'angular2/core';

The correct syntax should be:

import { Component } from '@angular2/core';

The spaces between the imports and curly brackets, as well as the use of the '@' symbol before 'angular2', have caused significant issues for me in the past.

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