alertAsync.js

import { Alert } from 'react-native';

// An alert implementation that returns a promise when the choise is done
export const AlertAsync = (
  title,
  message,
  buttons = [],
  options = {},
  type,
) => {
  return new Promise(resolve => {
    const interceptCallback = callback => {
      if (!callback) {
        resolve();
      } else {
        const maybePromise = callback();
        if (maybePromise instanceof Promise) {
          maybePromise.then(resolve, resolve);
        } else {
          resolve();
        }
      }
    };

    Alert.alert(
      title,
      message,
      buttons.map(button => ({
        ...button,
        onPress: () => interceptCallback(button.onPress),
      })),
      {
        ...options,
        onDismiss: () => interceptCallback(options.onDismiss),
      },
      type,
    );
  });
};