index.js

'use strict';

import {
	NativeModules
} from 'react-native';

let NativeStorage = NativeModules.Storage;

let Storage = {

	saveValue: function(key, value) {
		return new Promise((resolve, reject) => {
			NativeStorage.saveValue(key, value, function(err) {
				if (err) {
					reject(err);
				} else {
					resolve();
				}
			});
		});
	},

	getValue: function(key) {
		return new Promise((resolve, reject) => {
			NativeStorage.getValue(key, function(err, value) {
				if((!err && arguments.length === 1) || value === '') {
					return reject('value is empty or not found');
				}
				if (err) {
					reject(err);
				} else {
					resolve({value});
				}
			});
		});
	},

	resetValue: function(key) {
		return new Promise((resolve, reject) => {
			NativeStorage.resetValue(key, function(err) {
				if (err) {
					reject(err);
				} else {
					resolve();
				}
			});
		});
	}

};

export default Storage;