Promise await dictionary

Object-based counterparts to Promise.all and Promise.allSettled. Instead of accepting an array of promises and returning an array of results, they accept a record of promises and return a record of results under the same keys.

Type	TC39	CoreJS	Babel	Civet	JS+
Polyfill	✅ Stage 2.7 View	❌	❌	❌	✅ via Custom

Promise.allKeyed(promises)

Baseline

Resolves when all promises in the record have resolved, returning a record with the same keys mapped to their resolved values. Rejects immediately if any promise rejects.

const result = await Promise.allKeyed({
  user: fetchUser(),
  settings: fetchSettings(),
  notifications: fetchNotifications(),
});

result.user; // → resolved User
result.settings; // → resolved Settings
result.notifications; // → resolved Notification[]

Rejects immediately if any promise rejects, just like Promise.all:

await Promise.allKeyed({
  a: Promise.resolve(1),
  b: Promise.reject(new Error('failed')),
});
// ✗ Error: failed

Promise.allSettledKeyed(promises)

Baseline

const result = await Promise.allSettledKeyed({
  user: fetchUser(),
  settings: fetchSettings(),
  notifications: fetchNotifications(),
});

if (result.user.status === 'fulfilled') {
  console.log(result.user.value);
} else {
  console.error(result.user.reason);
}