chore: add typescript types

src/index.d.ts

@@ -0,0 +1,13 @@
+declare module 'multihashing-async' {
+  function Multihashing(buf: Buffer, alg: number|string, length?: number): Promise<Buffer>
+  namespace Multihashing {
+    export const Buffer: Buffer
+    export const multihash: Function
+    export const functions: Record<number, Function>
+    export function digest(buf: Buffer, alg: (number | string), length?: number): Promise<Buffer>
+    export function createHash(alg: (string | number)): Function
+    export function validate(buf: Buffer, hash: Buffer): Promise<boolean>
+  }
+  // eslint-disable-next-line import/no-default-export
+  export default Multihashing
+}