While running tslint in an angular unit test, an error was encountered stating 'unused expression, expected an assignment or function call'

Is there a method to resolve this issue without needing to insert an ignore directive in the file?

Error encountered during command execution:

./node_modules/tslint/bin/tslint -p src/tsconfig.json --type-check src/app/app.component.spec.ts
[21, 5]: unused expression, expected an assignment or function call

Test case:

let chai = require('chai');
let expect = chai.expect;

import { AppComponent } from './app.component';

import { ComponentFixture, TestBed } from '@angular/core/testing';

describe('AppComponent', function() {
  let testAppComponent: AppComponent;
  let fixture: ComponentFixture<AppComponent>;

  beforeEach(() => {
    TestBed.configureTestingModule({
      declarations: [AppComponent]
    });
    fixture = TestBed.createComponent(AppComponent);
    testAppComponent = fixture.componentInstance;
  });

  it('should correctly instantiate the component', () => {
    expect(testAppComponent instanceof AppComponent).to.be.true;
  });
});

Answer №1

Were you suggesting something along these lines:

assert(typeof(someVariable) === 'string');

The code snippet you provided only checks for properties, it requires a function call to perform an action.

Answer №2

There was a misplaced ? in my particular situation

someArray.find(someCheck)?.items.push(someThing)

To rectify this, I rephrased it using an if statement:

let foundItem = someArray.find(someCheck);
if (foundItem) {
 foundItem.items.push(someThing);
}

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