react-hooks.d.ts

import * as React from "react";

declare module "react" {
  // Suspense
  function lazy(loader: () => Promise<any>): React.ComponentType<any>;
  const Suspense: React.ComponentType<any>;

  // Hooks
  function useState<T>(
    initialState: T | (() => T)
  ): [T, (newState: T | ((s: T) => T)) => void];
  function useEffect(
    create: () => void | (() => void),
    inputs?: ReadonlyArray<unknown>
  ): void;
  function useContext<T>(foo: React.Context<T>): T;
  function useReducer<S, A>(
    reducer: (state: S, action: A) => S,
    initialState: S
  ): [S, (action: A) => void];
  function useCallback<F extends (...args: never[]) => unknown>(
    callback: F,
    inputs?: ReadonlyArray<unknown>
  ): F;
  function useMemo<T>(create: () => T, inputs?: ReadonlyArray<unknown>): T;
  function useRef<T extends unknown>(initialValue?: T): React.RefObject<T>;
  function useImperativeMethods<T>(
    ref: React.Ref<T>,
    createInstance: () => T,
    inputs?: ReadonlyArray<unknown>
  ): void;
  const useMutationEffect: typeof useEffect;
  const useLayoutEffect: typeof useEffect;
}