Turn InAppPurchase into an EventEmitter

lib/browser/api/in-app-purchase.js

@@ -1,39 +1,10 @@
 'use strict'
 
-const binding = process.atomBinding('in_app_purchase')
-const v8Util = process.atomBinding('v8_util')
+const {EventEmitter} = require('events')
+const {inAppPurchase, InAppPurchase} = process.atomBinding('in_app_purchase')
 
-module.exports = {
+// inAppPurchase is an EventEmitter.
+Object.setPrototypeOf(InAppPurchase.prototype, EventEmitter.prototype)
+EventEmitter.call(inAppPurchase)
 
-  canMakePayments: function () {
-    return binding.canMakePayments()
-  },
-
-  getReceiptURL: function () {
-    return binding.getReceiptURL()
-  },
-
-  purchaseProduct: function (productID, quantity = 1, callback) {
-    if (typeof productID !== 'string') {
-      throw new TypeError('productID must be a string')
-    }
-    if (typeof quantity === 'function') {
-      quantity = 1
-      callback = quantity
-    }
-    return binding.purchaseProduct(productID, quantity, callback)
-  },
-
-  addTransactionListener: function (callback) {
-    if (typeof callback !== 'function') {
-      throw new TypeError('callback must be a function')
-    }
-    return binding.addTransactionListener(callback)
-  }
-}
-
-// Mark standard asynchronous functions.
-v8Util.setHiddenValue(
-  module.exports.purchaseProduct, 'asynchronous', true)
-v8Util.setHiddenValue(
-  module.exports.addTransactionListener, 'asynchronous', true)
+module.exports = inAppPurchase