3.1.spec.ts

describe('3.1', (): void => {
  describe('mapped types on tuples and arrays', (): void => {
    // type MapToPromise<T> = {
    //   [K in keyof T]: Promise<T[K]>
    // };
    type Coordinate = [number, number];
    // type PromiseCoordinate = MapToPromise<Coordinate>; // [Promise<number>, Promise<number>]

    it('when type T is a tuple, only numeric properties are converted', (): void => {
      const point: Coordinate = [10, 20];
      // tslint:disable-next-line no-console
      console.log(`what's the ${point}`);
      // const promPoint =
    });
  });
  describe('property declarations on functions', (): void => {
    it('allow setting default props on React functions', (): void => {
      const FooComponent = ({ name }: { name: string }): void => {
        // tslint:disable-next-line no-console
        console.log(name);
      };
      FooComponent.defaultProps = { name: '(anonymous)' };
    });
  });
});