jdmunro

export const MY_SCHEDULE = false
export const MY_MESSAGES = false
export const MY_ACCOUNT = true

jdmunro

import * as featureFlags from './featureFlags'

...

<View>
  {featureFlags.MY_SCHEDULE ? <MyScheduleButton.../> : null}
  {featureFlags.MY_MESSAGES ? <MyMessagesButton.../> : null}
  {featureFlags.MY_ACCOUNT ? <MyAccountButton.../> : null}
</View>

jdmunro

### Keybase proof

I hereby claim:

  * I am jdmunro on github.
  * I am jdmunro (https://keybase.io/jdmunro) on keybase.
  * I have a public key ASC8mRg8SLIbrIwkV5OEZ6D6b16VuPTHi_rFUeJEbV8xUgo

To claim this, I am signing this object:

jdmunro

// Naive example: results in runtime error if native module not present in native binary
import {PushNotificationIOS} from 'react-native' // Same problem if you use require

if (PushNotificationIOS) { // Referencing this variable immediately throws a runtime exception
  alert('We have the library')
}

// Solution: you can wrap in an exception handler
const safePushNotificationIOS = () => {
  try {

jdmunro

/* @flow */

import { Platform } from 'react-native'

const PLATFORM_PREFERENCES = Object.freeze({
  ios: ['ios', 'mobile'],
  android: ['android', 'mobile'],
  web: ['web'],
})

jdmunro

/* @flow */
// https://github.com/necolas/react-native-web/issues/298#issuecomment-292776647
import { View } from 'react-native'
import * as React from 'react'

import type { Style } from 'app/types'

type Point = {|
  x: number,
  y: number,

jdmunro

module.exports = {
  // ...
  resolve: {
    // ...
    alias: {
      "@datacamp/react-native-linear-gradient": path.resolve(
        __dirname,
        "./mocked_modules/react-native-linear-gradient"
      )
    }

jdmunro

export default class LinearGradient extends React.PureComponent<Props> {
  render() {
    // See gist for full implementation
    // https://bit.ly/2X2yJzL
    // ...
  }
}

jdmunro

import * as React from "react";

const codePush = (App: React.Node) => App;

codePush.getUpdateMetaData = () => {
  return Promise.resolve(null);
};

export default codePush;

jdmunro

const marginStyle = {
  marginTop: Platform.OS === "android" ? 60 : 19,
  marginBottom: Platform.OS === "android" ? 60 : 0
};