multiple-request-promise-all-setlled-request.js

function handleResults(results) {
    const errors = results
        .filter(result => result.status === 'rejected')
        .map(result => result.reason)

    if (errors.length) {
        throw new AggregateError(errors)
    }

    return results.map(result => result.value)
}

async function loadInitialData() {

    const results = await Promise.allSettled([
        fetchUser(), fetchProduct(), fetchOther()
    ]);

    try {
        const [user, product, other] = handleResults(results)
    } catch (err) {
        for (const error of err.errors) {
            handleTheError(error)
        }
    }
}