[英]Can you create a class before exporting it in typescript/angular? | TSLint: unused expression, expected an assignment or function call
[英]'unused expression, expected an assignment or function call' in an angular unit test when running tslint
有沒有辦法解決這個錯誤而不必在文件中放置一個忽略?
運行命令時出錯:
./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
測試:
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 create the correct component', () => {
expect(testAppComponent instanceof AppComponent).to.be.true;
});
});
你也許是這個意思:
expect(testAppComponent instanceof AppComponent).toBe(true);
你在那里的表達式只是訪問一堆屬性,你需要某種函數調用才能讓它真正做任何事情。
就我而言,我有一個懸空?
someArray.find(someCheck)?.items.push(someThing)
我只是把它寫成一個if
語句:
let ok = someArray.find(someCheck);
if (ok) {
ok.items.push(someThing);
}
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