function* inner() {
  yield 1;
  yield 2;
  return 10;
}

function* outer() {
  const result = yield* inner();
  yield result;
  yield 3;
}

const gen = outer();
const a = gen.next().value;
const b = gen.next().value;
const c = gen.next().value;
const d = gen.next().value;
console.log(a, b, c, d);