Exploring the Benefits of Angular 2 Beta Typings within Visual Studio (ASP.NET 4)

During my initial experiences with Angular 2.0 alpha versions, I utilized the files from DefinitelyTyped to incorporate typings for TypeScript in Visual Studio. The process was straightforward - simply adding the d.ts files to the project. However, as we transitioned into the beta stage, it appears that things have changed. The d.ts files are no longer provided by DefinitelyTyped and have now been integrated directly into the angular repository.

The issue now arises as to which specific file should be included in the project initially. Including all of them results in a plethora of errors during compilation.

My current setup involves a DNN website where my VS project is located within the DesktopModules folder, meaning that the project is not at the root level of the website. SystemJS is used to load components from various locations within this site.

Is there a simple solution to include one d.ts file or combine them in a way that allows TypeScript to compile correctly?

EDIT - Further clarification:

In the alpha stage, when using an import statement like 

import * as ng from 'angular2/angular2'
, SystemJS would resolve the 'angular2/angular2' path and JS file, while Visual Studio recognized it due to the declaration in the definition file. How can I replicate this functionality once again? I have spent many hours attempting without success, aside from modifying the old Alpha stage .d.ts file to declare it as angular2/core.

How can this challenge be overcome without resorting to the new ASP.NET 5 project system?

visual-studiotypescriptangular

Answer №1

With the introduction of the "exclude" section in tsconfig.json by TypeScript, setting up a project has become much easier. Instead of manually listing every file that belongs to your project in the "files" section of the tsconfig, you can now simply exclude unwanted files and everything else will automatically be included in your project.

In Angular2, typings are included as part of the framework, eliminating the need for manual addition via tsd/typings. Your IDE should handle resolving them automatically.

However, it is important to remember to exclude the "node_modules" folder in tsconfig.json to prevent the compiler from attempting to compile its contents and avoid encountering numerous "duplicate identifier" errors.

For a more detailed guide, you can refer to a sample walkthrough tailored for Visual Studio: Starting Angular 2 in ASP.NET 5 with TypeScript using Visual Studio 2015

Answer №2

I've found a simple workaround that works for me during development. I am able to use this solution because it is only necessary at the development stage.

To make everything function properly, you need to utilize the GitHub source code of DNN and add your projects to the solution.

In order for Visual Studio to locate the typings, I copied the angular2 folder from my JSPM location to the root directory of the website (rxjs needs to be included as well). This enables Visual Studio to search for a folder named angular2 and a file named core in the root directory when using the statement 

import * as ng from 'angular2/core'
. Following this method, compilation runs smoothly, errors disappear, and IntelliSense functionality is restored.

During runtime, there are no issues since all script files are loaded through SystemJS from the designated location where JSPM packages are stored. Therefore, the copied folders are unnecessary; they simply assist Visual Studio in locating the typings.

It should be noted that this issue is not with Angular itself, but rather TypeScript's lack of familiarity with JSPM, resulting in difficulty finding the correct location to load the typings from. There is an ongoing discussion in the TypeScript repository on GitHub that provides more insight on this matter. In upcoming versions, there may be a feature allowing users to specify paths for TypeScript to search, or even integration between JSPM and TypeScript.

https://github.com/Microsoft/TypeScript/issues/6012

Answer №3

One key discovery I have made in Visual Studio is the significance of the typescript.d.ts file located within the node-modules\typescript\lib directory. Additionally, embedding the js files into index.html proved to be essential for eliminating the red squiggles.

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