refactor: extract event-emitter to specific file

src/eventEmitter.ts

@@ -0,0 +1,49 @@
+import {EmitterSubscription, NativeEventEmitter} from 'react-native';
+
+import {getAndroidModule, getIosModule, getNativeModule} from './iap';
+import {isAndroid, isIos} from './internal';
+import type {PurchaseError} from './purchaseError';
+import type {Purchase} from './types';
+
+const eventEmitter = new NativeEventEmitter(getNativeModule());
+
+/**
+ * Add IAP purchase event
+ */
+export const purchaseUpdatedListener = (
+  listener: (event: Purchase) => void,
+) => {
+  const emitterSubscription = eventEmitter.addListener(
+    'purchase-updated',
+    listener,
+  );
+
+  if (isAndroid) {
+    getAndroidModule().startListening();
+  }
+
+  return emitterSubscription;
+};
+
+/**
+ * Add IAP purchase error event
+ */
+export const purchaseErrorListener = (
+  listener: (error: PurchaseError) => void,
+): EmitterSubscription => eventEmitter.addListener('purchase-error', listener);
+
+/**
+ * Add IAP promoted subscription event
+ *
+ * @platform iOS
+ */
+export const promotedProductListener = (listener: () => void) => {
+  if (isIos) {
+    return new NativeEventEmitter(getIosModule()).addListener(
+      'iap-promoted-product',
+      listener,
+    );
+  }
+
+  return null;
+};

src/hooks/withIAPContext.tsx

@@ -1,12 +1,11 @@
 import React, {useContext, useEffect, useMemo, useState} from 'react';
 
 import {
-  getPromotedProductIOS,
-  initConnection,
   promotedProductListener,
   purchaseErrorListener,
   purchaseUpdatedListener,
-} from '../iap';
+} from '../eventEmitter';
+import {getPromotedProductIOS, initConnection} from '../iap';
 import type {PurchaseError} from '../purchaseError';
 import type {
   InAppPurchase,

src/iap.ts

@@ -1,10 +1,4 @@
-import {
-  EmitterSubscription,
-  Linking,
-  NativeEventEmitter,
-  NativeModules,
-  Platform,
-} from 'react-native';
+import {Linking, NativeModules, Platform} from 'react-native';
 
 import type * as Amazon from './types/amazon';
 import type * as Android from './types/android';
@@ -15,9 +9,7 @@ import {
   fillProductsWithAdditionalData,
   isAmazon,
   isAndroid,
-  isIos,
 } from './internal';
-import type {PurchaseError} from './purchaseError';
 import type {
   InAppPurchase,
   Product,
@@ -55,7 +47,9 @@ const checkNativeAndroidAvailable = (): void => {
   }
 };
 
-const getAndroidModule = (): typeof RNIapModule | typeof RNIapAmazonModule => {
+export const getAndroidModule = ():
+  | typeof RNIapModule
+  | typeof RNIapAmazonModule => {
   checkNativeAndroidAvailable();
 
   return androidNativeModule
@@ -71,13 +65,13 @@ const checkNativeIOSAvailable = (): void => {
   }
 };
 
-const getIosModule = (): typeof RNIapIos => {
+export const getIosModule = (): typeof RNIapIos => {
   checkNativeIOSAvailable();
 
   return RNIapIos;
 };
 
-const getNativeModule = ():
+export const getNativeModule = ():
   | typeof RNIapModule
   | typeof RNIapAmazonModule
   | typeof RNIapIos => {
@@ -575,52 +569,6 @@ export const validateReceiptAmazon = async (
   return await enhancedFetch<Amazon.ReceiptType>(url);
 };
 
-/**
- * Add IAP purchase event
- * @returns {callback(e: InAppPurchase | ProductPurchase)}
- */
-export const purchaseUpdatedListener = (
-  listener: (event: InAppPurchase | SubscriptionPurchase) => void,
-): EmitterSubscription => {
-  const emitterSubscription = new NativeEventEmitter(
-    getNativeModule(),
-  ).addListener('purchase-updated', listener);
-
-  if (isAndroid) {
-    getAndroidModule().startListening();
-  }
-
-  return emitterSubscription;
-};
-
-/**
- * Add IAP purchase error event
- * @returns {callback(e: PurchaseError)}
- */
-export const purchaseErrorListener = (
-  listener: (errorEvent: PurchaseError) => void,
-): EmitterSubscription =>
-  new NativeEventEmitter(getNativeModule()).addListener(
-    'purchase-error',
-    listener,
-  );
-
-/**
- * Add IAP promoted subscription event
- * Only available on iOS
- */
-export const promotedProductListener = (
-  listener: (productId?: string) => void,
-): EmitterSubscription | null => {
-  if (isIos) {
-    return new NativeEventEmitter(getIosModule()).addListener(
-      'iap-promoted-product',
-      listener,
-    );
-  }
-  return null;
-};
-
 /**
  * Get the current receipt base64 encoded in IOS.
  * @param {forceRefresh?:boolean}

src/index.ts

@@ -1,5 +1,6 @@
 export * from './iap';
 export * from './types';
+export * from './eventEmitter';
 export * from './hooks/useIAP';
 export * from './hooks/withIAPContext';
 export * from './purchaseError';