Added type declaration file.

Author: ricmoo

package.json

@@ -1,11 +1,12 @@
 {
   "name": "scrypt-js",
-  "version": "3.0.0",
+  "version": "3.0.1",
   "description": "The scrypt password-based key derivation function with sync and cancellable async.",
   "main": "scrypt.js",
   "scripts": {
     "test": "mocha test/test-scrypt.js"
   },
+  "types": "scrypt.d.ts",
   "devDependencies": {
     "mocha": "6.2.2"
   },

scrypt.d.ts

@@ -0,0 +1,23 @@
+
+export as namespace scrypt;
+
+export type ProgressCallback = (progress: number) => boolean | void;
+
+export function scrypt(
+    password: ArrayLike<number>,
+    salt: ArrayLike<number>,
+    N: number,
+    r: number,
+    p: number,
+    dkLen: number,
+    callback?: ProgressCallback
+): Promise<Uint8Array>;
+
+export function syncScrypt(
+    password: ArrayLike<number>,
+    salt: ArrayLike<number>,
+    N: number,
+    r: number,
+    p: number,
+    dkLen: number
+): Uint8Array;