Random tests are needed

The kata design is illogical:

	it("Should return a Promise if a Promise is yielded", () => {
		const result = asynk(function* () {
			yield Promise.resolve(1);
		});
		expect(result).toBeInstanceOf(Promise);
	});
	it("Should throw an error if a non-Promise is yielded", () => {
		const result = () =>
			asynk(function* () {
				yield 1;
			});
		expect(result).toThrow();
	});

If asynk is supposed to be async, it should return a Promise and be handled in usual ways (.then/.catch). Async errors aren't thrown to the current point of execution.

A generator returning a Promise isn't async code at all; it is a generator, not an async generator. The execution point stays the same scope, and returns to the same place when something is yielded/returned from the generator.

So why is the generator returning Promises? Does the kata author even know how async/await and generators work?