fix: Improve Hash.digest(encoding) TypeScript return type (#964)

Author: fredikey

packages/react-native-quick-crypto/src/hash.ts

@@ -120,7 +120,7 @@ class Hash extends Stream.Transform {
    * @param encoding The `encoding` of the return value.
    */
   digest(): Buffer;
-  digest(encoding: Encoding): Buffer;
+  digest(encoding: Encoding): string;
   digest(encoding?: Encoding): Buffer | string {
     const nativeDigest = this.native.digest(encoding);
 
@@ -296,6 +296,12 @@ const internalDigest = (
   return arrayBuffer;
 };
 
+export function hash(
+  algorithm: string,
+  data: BinaryLike,
+  outputEncoding: Encoding,
+): string;
+export function hash(algorithm: string, data: BinaryLike): Buffer;
 export function hash(
   algorithm: string,
   data: BinaryLike,