Typescript: Объектные типы (Object Types)

import { expect, test, expectTypeOf } from 'vitest';

import isComplete from './index';

test('function', () => {
  const course1 = {
    name: 'Java',
    lessons: ['variables', 'functions', 'conditions'],
  };
  expect(isComplete(course1)).toBe(false);

  const course2 = {
    name: 'Java',
    lessons: ['variables', 'functions', 'conditions', 'loops'],
  };
  expect(isComplete(course2)).toBe(true);

  const course3 = {
    name: 'Java',
    lessons: ['variables', 'functions', 'conditions', 'loops', 'cringe'],
  };
  expect(isComplete(course3)).toBe(true);

  expectTypeOf(isComplete).returns.toMatchTypeOf<boolean>();
  expectTypeOf(isComplete).parameter(0).toMatchTypeOf<{ name: string, lessons: string[] }>();
});