create-tstyche/examples/isSameLength.tst.ts

The TSTyche starter kit.

import { expect, test } from "tstyche";

function isSameLength<T extends { length: number }>(a: T, b: T) {
  return a.length === b.length;
}

test("isSameLength", () => {
  expect(isSameLength([1, 2], [1, 2, 3])).type.toBe<boolean>();
  expect(isSameLength("one", "two")).type.toBe<boolean>();

  expect(isSameLength).type.not.toBeCallableWith(1, 2);
  expect(isSameLength).type.not.toBeCallableWith("zero", [123]);

  expect(isSameLength<string | Array<number>>).type.toBeCallableWith("zero", [123]);
});