diff --git a/src/index.ts b/src/index.ts
index ffcac791..086916f8 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -74,6 +74,7 @@ export * from './useWindowSize/index.js';
 export {isStrictEqual, truthyAndArrayPredicate, truthyOrArrayPredicate} from './util/const.js';
 export type {EffectCallback, EffectHook} from './util/misc.js';
 export {resolveHookState} from './util/resolve-hook-state.js';
+export type {InitialState, NextState} from './util/resolve-hook-state.js';
 
 // Types
 export type * from './types.js';
diff --git a/src/util/resolve-hook-state.ssr.test.ts b/src/util/resolve-hook-state.ssr.test.ts
new file mode 100644
index 00000000..15b0e848
--- /dev/null
+++ b/src/util/resolve-hook-state.ssr.test.ts
@@ -0,0 +1,19 @@
+import type {InitialState, NextState} from '../index.js';
+import {describe, expect, it} from 'vitest';
+import {resolveHookState} from '../index.js';
+
+describe('public hook state types', () => {
+	it('should export initializer and updater types from the package root', () => {
+		const initialState: InitialState<number> = () => 123;
+		const nextState: NextState<number> = (previousState) => previousState + 1;
+
+		expect(resolveHookState(initialState)).toBe(123);
+		expect(resolveHookState(nextState, 123)).toBe(124);
+	});
+
+	it('should support a different previous state type for mediated updates', () => {
+		const nextState: NextState<number, string> = (previousState) => previousState.length;
+
+		expect(resolveHookState(nextState, 'foo')).toBe(3);
+	});
+});