index.ts

// Please see http://facebook.github.io/react-native/docs/toastandroid.html for more documentation
import { NativeModules, ToastAndroid, Platform } from 'react-native'

const { MerryToast } = NativeModules
// android defaults to ToastAndroid
const Toast: ToastAndroid =
  Platform.OS === 'android' ? ToastAndroid : MerryToast
// not support windows yet

export default {
  // Toast duration constants
  SHORT: Toast.SHORT,
  LONG: Toast.LONG,

  // Toast gravity constants
  TOP: Toast.TOP,
  BOTTOM: Toast.BOTTOM,
  CENTER: Toast.CENTER,

  /**
   * @param {string} message A string with the text to toast
   * @param {number} duration The duration of the toast. May be Toast.SHORT or Toast.LONG
   */
  show: function(message: string, duration?: number) {
    Toast.show(message, (duration = this.SHORT))
	},

  /**
   * `gravity` may be ToastAndroid.TOP, ToastAndroid.BOTTOM, ToastAndroid.CENTER
   * @param {string} message A string with the text to toast
   * @param {number} duration The duration of the toast. May be Toast.SHORT or Toast.LONG
   * @param {number} gravity Specify the layout gravity. May be Toast.TOP or Toast.BOTTOM or Toast.CENTER
   */
  showWithGravity: function(
    message: string,
    duration: number,
    gravity: number
  ) {
    Toast.showWithGravity(message, (duration = this.SHORT), gravity)
  },
}