Rocket.Chat/client/lib/asyncState/AsyncState.ts

import { AsyncStatePhase } from './AsyncStatePhase';

export type AsyncState<T> = (
	{ phase: AsyncStatePhase.LOADING; value: undefined; error: undefined } |
	{ phase: AsyncStatePhase.LOADING; value: T; error: undefined } |
	{ phase: AsyncStatePhase.LOADING; value: undefined; error: Error } |
	{ phase: AsyncStatePhase.RESOLVED; value: T; error: undefined } |
	{ phase: AsyncStatePhase.UPDATING; value: T; error: undefined } |
	{ phase: AsyncStatePhase.REJECTED; value: undefined; error: Error }
);