dynamic import test

main.ts

(async () => {
    let foo = (i: number): [number, Promise<any>] => {
        switch(i) {
            case 0: return [4, import('./test')];
            default: return [0, Promise.resolve(null)];
        }
    }
    const res = foo(0);
    console.log(res[0], await res[1]);
    // should output `4 { default: { greeting: 'Hello World!' } }`
})();

test.ts

export default { greeting: 'Hello World!' };