feat: add typescript definitions

index.d.ts

@@ -0,0 +1,18 @@
+declare module 'web-worker-proxy' {
+  export function create(worker: Worker): any;
+
+  export function proxy(o: object, target?: Worker): { dispose(): void };
+
+  export function persist<T extends Function>(
+    fn: T
+  ): {
+    type: string;
+    apply(
+      that: any,
+      args: T extends (...args: infer A) => any ? A : never
+    ): ReturnType<T>;
+    dispose(): void;
+    on(name: 'dispose', cb: () => unknown): void;
+    disposed: boolean;
+  };
+}

package.json

@@ -6,9 +6,11 @@
     "web worker",
     "proxy"
   ],
+  "types": "index.d.ts",
   "main": "lib/index.js",
   "files": [
-    "lib/"
+    "lib/",
+    "index.d.ts"
   ],
   "license": "MIT",
   "repository": {

src/persist.js

@@ -23,7 +23,7 @@ export default function persist<T: *>(func: (...args: T) => mixed) {
       listeners.forEach(listener => listener());
       disposed = true;
     },
-    on(name: 'dispose', cb: Function) {
+    on(name: 'dispose', cb: () => mixed) {
       if (name === 'dispose') {
         listeners.push(cb);
       }