Angular2, ASP.NET 5 project setup. "Type expected" error on di.d.ts

Question

I am trying to get familiar with Angular2, TypeScript and ASP.NET 5. I am not very familiar with any of them so am following this tutorial:

My problem is that once I try to import from 'angular2/angular2' I am getting a build error in one of the Angular2 Typescript files.

So here is my folder structure:

Here is tsconfig.json

Here is gulpfile.js

and app.ts just contains the following:

import { Component, View, bootstrap } from 'angular2/angular2';

When I try to build, I get an error in di.d.ts. this is located in src\node_modules\angular2\src\core\metadata\di.d.ts

This is the error:

Error TS1110
Build: Type expected.

This is the line that the error refers to:

Any ideas why I'm getting this?

Hmmm, so if I have Version 1.7.3 (which is what i'm told when I run tsc -v on the package manager console) why is it not recognising the this keyword — Neil
– Neil, Commented Dec 11, 2015 at 15:01

m1kael · Accepted Answer · 2015-12-12 00:22:09Z

1

Looks like there's an error in the type definition file. Change

token: this;

to

token: AttributeMetadata;

and it should compile.

EDIT: This is indeed a feature, as @Eric Martinez commented, called "Polymorphic this Typing". Updating to TypeScript 1.7+ fixes the issue.

answered Dec 11, 2015 at 14:49

m1kael

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1 Comment

It's not a bug, it's a feature (no, not a joke) introduced in TypeScript 1.7