fix: the jest file issue and its usage

Author: Mhp23

README.md

@@ -120,8 +120,8 @@ To mock the package's methods and components using the default mock configuratio
 
 - Copy the following code into that file:
 
-  ```ts
-  export * from '@mhpdev/react-native-speech/jest';
+  ```js
+  module.exports = require('@mhpdev/react-native-speech/jest');
   ```
 
 ## Contributing

jest/index.js

@@ -0,0 +1,40 @@
+const mockFn = (...args) => {
+  return undefined;
+};
+
+const mockPromise = (...args) => Promise.resolve(undefined);
+const mockPromiseBool = (...args) => Promise.resolve(false);
+const mockPromiseArr = (...args) => Promise.resolve([]);
+
+const {fn: jestFn} = require('jest-mock');
+const eventSub = {remove: jestFn()};
+const eventMock = jestFn(() => eventSub);
+
+class Speech {
+  static reset = mockFn;
+  static stop = mockPromise;
+  static initialize = mockFn;
+  static speak = mockPromise;
+  static pause = mockPromiseBool;
+  static resume = mockPromiseBool;
+  static isSpeaking = mockPromiseBool;
+  static speakWithOptions = mockPromise;
+  static getAvailableVoices = mockPromiseArr;
+  static onError = eventMock;
+  static onStart = eventMock;
+  static onFinish = eventMock;
+  static onPause = eventMock;
+  static onResume = eventMock;
+  static onStopped = eventMock;
+  static onProgress = eventMock;
+}
+
+const HighlightedText = jestFn(function HighlightedText() {
+  return null;
+});
+
+module.exports = {
+  __esModule: true,
+  default: Speech,
+  HighlightedText,
+};