Error Alert: Redundant Identifier in Angular 2 TypeScript Documents

After following the Angular2 TS Quickstart guide, I noticed duplicate files scattered across various folders in my project.

For browser:

typings/browser 
node_modules/angular2/typings/browser

Regarding es6-shim:

node_modules/angular2/typings/es6-shim
typings/browser/ambient/es6-shim
typings/main/ambient/es6-shim

This duplication leads to errors like Duplicate Identifier during the build process.

How can we prevent or suppress TS from flagging duplicate identifier errors?

Even though I've excluded node_modules from the list, TSD still includes them back because of using Angular2 in my includes section and moduleResolution set to "node". Changing it to "classic" presents other issues.

This is the content of my tsconfig.json file:

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

UPDATE 1

Below is my appcomponent.ts file:

///<reference path="../../node_modules/angular2/typings/browser.d.ts"/> 
import {bootstrap} from 'angular2/platform/browser';
import {LocationComponent} from '../location/components/locationcomponent';
import {VideosComponent} from '../videos/components/videoscomponent';

bootstrap(LocationComponent, [])
  .catch(err => console.error(err));

bootstrap(VideosComponent, [])
  .catch(err => console.error(err));

UPDATE 2

This snippet shows my web project file:

<?xml version="1.0" encoding="utf-8"?>
<Project ToolsVersion="14.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
  (...)

UPDATE 3

My exploration revealed that setting up Angular2 in Visual Studio 2015 demands a different approach. I followed the guidelines in Starting Angular 2 in ASP.NET 5 with TypeScript using Visual Studio 2015 and successfully resolved the build issues.

Answer №1

Typescript versions 1.6 and below

To properly configure your tsconfig.json file, make sure to exclude the node_modules and typings/main files using **

"exclude": [
    "bower_components/**",
    "node_modules/**",
    "typings/main.d.ts",
    "typings/main/**",
],

It is important to include ** to specify the directories rather than individual files.

Typescript versions above 1.6

For versions of Typescript higher than 1.6, the use of ** is no longer necessary.

EDIT

Ensure to remove any reference paths in your appcomponent.ts. These references are not required when compiling Typescript in this manner.

Answer №2

To streamline your project, consider adding a "filesGlob" parameter in your tsconfig.json. This will allow you to omit any unnecessary files. Here's an example of how it can be implemented:

"filesGlob": [
    "./src/**/*.ts",
    "./test/**/*.ts",
    "!./node_modules/**/*.ts",
    "typings/browser.d.ts"
  ]

Answer №3

After some research, I discovered that setting up Angular2 in Visual Studio 2015 requires a different approach. By following the guidelines outlined in Setting up Angular 2 in ASP.NET 5 with TypeScript using Visual Studio 2015, I was able to avoid any build issues.

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