Numerous JavaScript errors are present in the ASP.NET Core Template Pack for Angular 2, causing issues with functionality

After discovering the ASPNETCoreTemplatePack by MadsKristensen, I was excited to use it as a foundation for developing ASP.NET Core applications with Angular 2. However, upon delving into editing, I encountered a whopping 448 errors in the error-list dialog. These errors stemmed from TypeScript files, some from example Angular components and others from node.js modules. The column labeled "project" indicated they were part of a "virtual TypeScript project," prompting me to open them randomly.

An illustration:

No. 1:

ClientApp/app/components/app/counter/counter.component.ts

@Component({
    selector: 'counter',
    template: require('./counter.component.html')
})

Visual Studio flagged an issue stating "The name "require" was not found."

No. 2:

node_modules/rxjs/add/operator/map.d.ts

import { MapSignature } from '../../operator/map';
declare module '../../Observable' {
    interface Observable<T> {
        map: MapSignature<T>;
    }
}

Error message: "Invalid module name in augmentation, module '../../Observable' cannot be found."

This trend continued across nearly 500 errors. Despite these issues, the app compiled successfully, functioning as expected. For instance, the counter-component, which initially failed due to the error, functioned well after the require-function loaded its view. My concern now is that these errors are distracting me from identifying genuine mistakes within my code, which need attention.

Attempts made so far:

  • Configuring TypeScriptCompileBlocked to true in the project file, following instructions outlined here:
  • Including a tsconfig.json in the project-root with
    "exclude": [ "bin", "node_modules" ]

Answer №1

Through my research, I discovered that certain functions like module or require, as well as some syntax constructs, were introduced in TypeScript Version 2.0. This initially confused me as my package.json file already referenced TypeScript 2.0.0. Even upgrading to the latest version at the time, 2.1.5, did not resolve the issue.

After exploring different avenues, I searched for the proverbial needle in a haystack, as we say in Germany. It was then that I came across TypeScript for Visual Studio 2015, which appeared to include validation rules for TypeScript in the error list window. Interestingly, its version matched that of TypeScript: TypeScript 2.1.5 > TypeScript for Visual Studio (2015) 2.1.5.

It is crucial to ensure that you have the same version of TypeScript for Visual Studio installed as the compiler version you are using. In my case, I had mistakenly been using an outdated version, 1.8.36, which came pre-installed with Visual Studio. The mismatch with the ASPNETCoreTemplatePack referencing 2.0.0 led to this issue.

Choosing a Specific Version

While addressing the above problem, I encountered a new challenge. Microsoft's download page listed several older versions such as 2.1.4 or 2.0.6, all linked to "TypeScript_Dev14Full.exe," which actually pointed to the latest version (currently 2.1.5). A wider range of versions can be found on the Visual Studio Marketplace.

Important: Some marketplace versions come with warnings about potentially breaking Visual Studio or TypeScript upon installation. While I personally haven't experienced any issues with version 2.1.5, it serves as a cautionary note for those facing problems with the most recent release. Remember to backup your data and consider creating a restore point for a smooth development environment should anything go awry.

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