const waitFor = () => {
    const promise = new Promise(resolve => {
        promise.resolve = resolve;
    });
    return promise;
};
const events = {
    eventA: waitFor(),
    eventB: waitFor(),
}
something.addEventListener('message', e => {
    events[e.data?.something]?.resolve(e); // assuming data is sent like {something: 'eventA'}
});
Promise.race([Promise.all(Object.values(events)), new Promise((resolve, reject) => setTimeout(reject, 10000, 'timeout'))])
.then(data => {
    //  events received
})
.catch(timeout => {
    // timeout happened
});