DefinitelyTyped/types/react-reconciler/ReactUpdateQueue.d.ts

import { ExpirationTime } from './ReactFiberExpirationTime';

export interface Update<State> {
    expirationTime: ExpirationTime;

    tag: 0 | 1 | 2 | 3;
    payload: any;
    callback: (() => any) | null;

    next: Update<State> | null;
    nextEffect: Update<State> | null;
}

export interface UpdateQueue<State> {
    baseState: State;

    firstUpdate: Update<State> | null;
    lastUpdate: Update<State> | null;

    firstCapturedUpdate: Update<State> | null;
    lastCapturedUpdate: Update<State> | null;

    firstEffect: Update<State> | null;
    lastEffect: Update<State> | null;

    firstCapturedEffect: Update<State> | null;
    lastCapturedEffect: Update<State> | null;
}