khadorkin

React recently introduced an experimental profiler API. This page gives instructions on how to use this API in a production release of your app.

Table of Contents

• Profiling in production
  • Create React App
  • Webpack 4
• Troubleshooting
  • Tracing broke after an NPM update

Profiling in production

khadorkin

import {
  Dimensions,
  LayoutChangeEvent,
  Platform,
  ScrollEvent,
  ScrollView,
  StyleSheet,
  View,
} from "react-native";
import {Font, Space} from "../atoms";

khadorkin

// Demo: https://snack.expo.io/@brunolemos/touch-button-scale-effect

import React from 'react'
import { Animated, StyleProp, TouchableWithoutFeedback, TouchableWithoutFeedbackProps, ViewStyle } from 'react-native'
import { styleMerge } from 'shared/src/utils'

export interface TouchableScaleProps extends TouchableWithoutFeedbackProps {
  containerStyle?: StyleProp<ViewStyle>
}

khadorkin

/* eslint no-useless-escape: 0 */
/* eslint max-len: 0 */
/**
 * For more info regarding metro config:
 * @see https://facebook.github.io/metro/docs/en/configuration
 */
const path = require("path");
const fs = require("fs");

// Get blacklist factory

khadorkin

# this should be the folder name under `ios` for your project
project_name = 'MyProject'

# NOTE: This is meant to be run on CI where it changes everything before building the app.
# Usage:
#   `RN_RELEASE_TYPE=beta fastlane prep_release_type` (on CI these ENV variables should be set via the UI)
#   Available release types: alpha, beta, production (default)
# 
# If you're trying this script out locally, make sure you have ImageMagick installed, and discard the changes via git when you're done.
desc "Updates the app identifier, display name and icon for alpha, beta, and production releases"

khadorkin

Inspired by dannyfritz/commit-message-emoji

See also gitmoji.

Commit type	Emoji
Initial commit	🎉 :tada:
Version tag	🔖 :bookmark:
New feature	✨ :sparkles:
Bugfix	🐛 :bug:

khadorkin

const path = require('path')

const sharedBlacklist = []

const platformBlacklists = {
  ios: [
    '.web.js',
    '.macos.js',
    /node_modules\/react-native-web\/.*/,
    /node_modules\/react-native-windows\/.*/,

khadorkin

import React, { Component } from 'react';
import firebase from '@firebase/app';
import firestore from './firestore'; // Code: https://gist.github.com/sconstantinides/546a48ba183b1234f750ca6261440199

class App extends Component {
  constructor(props) {
    super(props);

    this.state = {
      userId: localStorage.getItem('userId') || '',

khadorkin

import React, { Component, createContext }  from 'react'

function initStore(store) {
    const Context = createContext();

    class Provider extends React.Component {
        constructor() {
            super();
            this.state = store.initialState;
        }

khadorkin

<script>
// fbAsyncInit
// http://developers.facebook.com/docs/reference/javascript/FB.getLoginStatus/
window.fbAsyncInit = function() {
	// init the FB JS SDK
	FB.init({
		appId: '<?php echo(FB_APP_ID); ?>',
		status: true,
		cookie: true,
		xfbml: true,