Create a function promiseMerge(p1, p2) that takes two promises and resolves into a single value containing both results.

The function should:

• Wait until both promises have resolved.
• Return a promise that resolves with an array [result1, result2].
• If either promise rejects, the returned promise should reject with the error.

Examples

const p1 = Promise.resolve(1);
const p2 = Promise.resolve(2);

promiseMerge(p1, p2).then(console.log); // [1, 2]

const p3 = Promise.reject('error');
promiseMerge(p1, p3).catch(console.error); // 'error'