Merge pull request #4028 from Scott-Fischer/master

compat/src/index.d.ts

@@ -17,6 +17,7 @@ declare namespace React {
 	export import Inputs = _hooks.Inputs;
 	export import PropRef = _hooks.PropRef;
 	export import Reducer = _hooks.Reducer;
+	export import Dispatch = _hooks.Dispatch;
 	export import Ref = _hooks.Ref;
 	export import StateUpdater = _hooks.StateUpdater;
 	export import useCallback = _hooks.useCallback;
@@ -40,6 +41,7 @@ declare namespace React {
 	): T;
 
 	// Preact Defaults
+	export import Context = preact.Context;
 	export import ContextType = preact.ContextType;
 	export import RefObject = preact.RefObject;
 	export import Component = preact.Component;

hooks/src/index.d.ts

@@ -15,6 +15,7 @@ export function useState<S = undefined>(): [
 ];
 
 export type Reducer<S, A> = (prevState: S, action: A) => S;
+export type Dispatch<A> = (action: A) => void;
 /**
  * An alternative to `useState`.
  *
@@ -27,7 +28,7 @@ export type Reducer<S, A> = (prevState: S, action: A) => S;
 export function useReducer<S, A>(
 	reducer: Reducer<S, A>,
 	initialState: S
-): [S, (action: A) => void];
+): [S, Dispatch<A>];
 
 /**
  * An alternative to `useState`.
@@ -43,7 +44,7 @@ export function useReducer<S, A, I>(
 	reducer: Reducer<S, A>,
 	initialArg: I,
 	init: (arg: I) => S
-): [S, (action: A) => void];
+): [S, Dispatch<A>];
 
 /** @deprecated Use the `Ref` type instead. */
 type PropRef<T> = MutableRef<T>;