Function isFulfilled

Checks if a promise result is fulfilled. Can be used as a type guard to narrow the type of the result to PromiseFulfilledResult.

const fulfilled = new Promise((resolve) => setTimeout(() => resolve('done'), 1000));
const result = await settled(fulfilled);
console.log(isFulfilled(result)); // true

const results = await Promise.allSettled([
  Promise.resolve('done'),
  Promise.reject(new Error('fail')),
]);
console.log(results.filter(isFulfilled)); // [{ status: 'fulfilled', value: 'done' }]
console.log(results.filter(isRejected)); // [{ status: 'rejected', reason: Error('fail') }]
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