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node.jsangularunit-testingkarma-jasminekarma-webpack

Cannot find namespace 'NodeJS'. Karma unit Tests

I have created a fresh angular 17 (Node v18.14.1) project. and tried to run npm run test It fails with the following error.

Error: src/app/app.component.ts:13:9 - error TS2503: Cannot find namespace 'NodeJS'.

import { Component } from '@angular/core';
import { RouterOutlet } from '@angular/router';

@Component({
  selector: 'app-root',
  standalone: true,
  imports: [RouterOutlet],
  templateUrl: './app.component.html',
  styleUrl: './app.component.scss',
})
export class AppComponent {
  title = 'angular-tour-of-heroes';
  nodeJsTimeout: NodeJS.Timeout | null = null;
}

I already tried to add types: ["node"] in tsconfig.app.json and also in tsconfig.json. Didnt resolve my problem.

Solution

  • Not sure if this is the right solution of not. But the following type worked for me!

    nodeJsTimeout: ReturnType<typeof setInterval> | null = null;