@reactivex/rxjs/spec-dtslint/observables/race-spec.ts

Reactive Extensions for modern JavaScript

import { race, of } from 'rxjs';

it('should infer correctly with 1 parameter', () => {
  const a = of(1);
  const o = race(a); // $ExpectType Observable<number>
});

describe('race(a, b, c)', () => {
  it('should infer correctly with multiple parameters of the same type', () => {
    const a = of(1);
    const b = of(2);
    const o = race(a, b); // $ExpectType Observable<number>
  });

  it('should support 2 parameters with different types', () => {
    const a = of(1);
    const b = of('a');
    const o = race(a, b); // $ExpectType Observable<string | number>
  });

  it('should support 3 parameters with different types', () => {
    const a = of(1);
    const b = of('a');
    const c = of(true);
    const o = race(a, b, c); // $ExpectType Observable<string | number | boolean>
  });

  it('should support 4 parameters with different types', () => {
    const a = of(1);
    const b = of('a');
    const c = of(true);
    const d = of([1, 2, 3]);
    const o = race(a, b, c, d); // $ExpectType Observable<string | number | boolean | number[]>
  });

  it('should support 5 parameters with different types', () => {
    const a = of(1);
    const b = of('a');
    const c = of(true);
    const d = of([1, 2, 3]);
    const e = of(['blah']);
    const o = race(a, b, c, d, e); // $ExpectType Observable<string | number | boolean | number[] | string[]>
  });

  it('should support 6 or more parameters of the same type', () => {
    const a = of(1);
    const o = race(a, a, a, a, a, a, a, a, a, a, a, a, a, a); // $ExpectType Observable<number>
  });

  it('should return {} for 6 or more arguments of different types', () => {
    const a = of(1);
    const b = of('a');
    const c = of(true);
    const d = of([1, 2, 3]);
    const e = of(['blah']);
    const f = of({ foo: 'bar' });
    const o = race(a, b, c, d, e, f); // $ExpectType Observable<{}>
  });
});

describe('race([a, b, c])', () => {
  it('should infer correctly with multiple parameters of the same type', () => {
    const a = of(1);
    const b = of(2);
    const o = race([a, b]); // $ExpectType Observable<number>
  });

  it('should support 2 parameters with different types', () => {
    const a = of(1);
    const b = of('a');
    const o = race([a, b]); // $ExpectType Observable<string | number>
  });

  it('should support 3 parameters with different types', () => {
    const a = of(1);
    const b = of('a');
    const c = of(true);
    const o = race([a, b, c]); // $ExpectType Observable<string | number | boolean>
  });

  it('should support 4 parameters with different types', () => {
    const a = of(1);
    const b = of('a');
    const c = of(true);
    const d = of([1, 2, 3]);
    const o = race([a, b, c, d]); // $ExpectType Observable<string | number | boolean | number[]>
  });

  it('should support 5 parameters with different types', () => {
    const a = of(1);
    const b = of('a');
    const c = of(true);
    const d = of([1, 2, 3]);
    const e = of(['blah']);
    const o = race([a, b, c, d, e]); // $ExpectType Observable<string | number | boolean | number[] | string[]>
  });

  it('should support 6 or more parameters of the same type', () => {
    const a = of(1);
    const o = race([a, a, a, a, a, a, a, a, a, a, a, a, a, a]); // $ExpectType Observable<number>
  });

  it('should return {} for 6 or more arguments of different types', () => {
    const a = of(1);
    const b = of('a');
    const c = of(true);
    const d = of([1, 2, 3]);
    const e = of(['blah']);
    const f = of({ foo: 'bar' });
    const o = race([a, b, c, d, e, f]); // $ExpectType Observable<{}>
  });
});

it('should race observable inputs', () => {
  const o = race(of(1), Promise.resolve('foo'), [true, false]); // $ExpectType Observable<string | number | boolean>
});

it('should race an array observable inputs', () => {
  const o = race([of(1), Promise.resolve('foo'), [true, false]]); // $ExpectType Observable<string | number | boolean>
});