diff --git a/index.d.ts b/index.d.ts
new file mode 100644
index 0000000..cf6e03f
--- /dev/null
+++ b/index.d.ts
@@ -0,0 +1,10 @@
+import { WorkerStore } from "./worker";
+import { Store } from "unistore";
+
+/**
+ * Create a new store based on a Worker.
+ * @param worker Instance of WorkerStore.
+ */
+export default function createStore<WorkerState>(
+	worker: WorkerStore<WorkerState>
+): WorkerStore<WorkerState>;
diff --git a/worker.d.ts b/worker.d.ts
new file mode 100644
index 0000000..1782831
--- /dev/null
+++ b/worker.d.ts
@@ -0,0 +1,61 @@
+import { Action, Store } from "unistore";
+
+/**
+ * Actions object.
+ */
+export interface Actions<WorkerState> {
+	[action: string]: Action<WorkerState>;
+}
+
+/**
+ * Types of actions received by registerActions.
+ */
+export type ActionRegister<WorkerState> = (
+	store: WorkerStore<WorkerState>
+) => Actions<WorkerState> | Actions<WorkerState>;
+
+/**
+ * Enhanced unistore store.
+ */
+export interface WorkerStore<WorkerState> extends Store<WorkerState> {
+
+	/**
+	 * Creates a new instance of WorkerStore.
+	 */
+	new(): WorkerStore<WorkerState>;
+
+	/**
+	 * Retrieves the given action.
+	 * @param action Action to retrieve (Worker actions take strings).
+	 */
+	action(action: Action<WorkerState> | string): (...params: any[]) => void;
+
+	/**
+	 * List of registered actions.
+	 */
+	actions: Actions<WorkerState>;
+
+	/**
+	 * Register new actions.
+	 * @param newActions Object or callback function.
+	 */
+	registerActions(newActions: ActionRegister<WorkerState>): void;
+
+	/**
+	 * Queue all additional processing until unfrozen.
+	 */
+	freeze(): void;
+
+	/**
+	 * Remove a freeze lock and process queued work
+	 */
+	unfreeze(): void;
+}
+
+/**
+ * Creates a WebWorker unistore instance.
+ * @param initialState Initial state to populate.
+ */
+export default function createWorkerStore<WorkerState>(
+	initialState: WorkerState
+): WorkerStore<WorkerState>;