index.js

import { NativeEventEmitter, NativeModules, Platform } from "react-native";

const { InAppUtils } = NativeModules;

const InAppUtilsEmitter = new NativeEventEmitter(InAppUtils);

const promisify = fn => (...args) =>
  new Promise((resolve, reject) => {
    fn(...args, (err, res) => (err ? reject(err) : resolve(res)));
  });

const IAU = Platform.select({
  ios: {
    loadProducts: (products, cb) =>
      cb
        ? InAppUtils.loadProducts(products, cb)
        : promisify(InAppUtils.loadProducts)(products),

    canMakePayments: cb =>
      cb
        ? InAppUtils.canMakePayments(cb)
        : promisify(InAppUtils.canMakePayments)(),

    purchaseProduct: (productIdentifier, cb) =>
      cb
        ? InAppUtils.purchaseProduct(productIdentifier, cb)
        : promisify(InAppUtils.purchaseProduct)(productIdentifier),

    purchaseProductForUser: (productIdentifier, username, cb) =>
      cb
        ? InAppUtils.purchaseProductForUser(productIdentifier, username, cb)
        : promisify(InAppUtils.purchaseProductForUser)(
            productIdentifier,
            username
          ),

    restorePurchases: cb =>
      cb
        ? InAppUtils.restorePurchases(cb)
        : promisify(InAppUtils.restorePurchases)(),

    restorePurchasesForUser: (username, cb) =>
      cb
        ? InAppUtils.restorePurchasesForUser(username, cb)
        : promisify(InAppUtils.restorePurchasesForUser)(username),

    receiptData: cb =>
      cb ? InAppUtils.receiptData(cb) : promisify(InAppUtils.receiptData)(),

    shouldFinishTransactions: (finishTransactions, cb) =>
      cb
        ? InAppUtils.shouldFinishTransactions(finishTransactions, cb)
        : promisify(InAppUtils.shouldFinishTransactions)(finishTransactions),

    getPurchaseTransactions: cb =>
      cb
        ? InAppUtils.getPurchaseTransactions(cb)
        : promisify(InAppUtils.getPurchaseTransactions)(),

    finishCurrentTransaction: cb =>
      cb
        ? InAppUtils.finishCurrentTransaction(cb)
        : promisify(InAppUtils.finishCurrentTransaction)(),

    clearCompletedTransactions: cb =>
      cb
        ? InAppUtils.clearCompletedTransactions(cb)
        : promisify(InAppUtils.clearCompletedTransactions)(),

    addListener: (...args) => InAppUtilsEmitter.addListener(...args)
  },

  android: {}
});

export default IAU;