https://github.com/kentcdodds/concurrent-react

React Suspense Egghead course
https://github.com/kentcdodds/concurrent-react
Last synced: 4 months ago
JSON representation
React Suspense Egghead course
Host: GitHub
URL: https://github.com/kentcdodds/concurrent-react
Owner: kentcdodds
Created: 2020-03-21T15:14:50.000Z (over 6 years ago)
Default Branch: main
Last Pushed: 2021-01-25T23:12:53.000Z (over 5 years ago)
Last Synced: 2025-04-23T00:11:20.501Z (over 1 year ago)
Language: JavaScript
Homepage: https://kcd.im/egghead-suspense
Size: 725 KB
Stars: 49
Watchers: 1
Forks: 7
Open Issues: 0
Metadata Files:
- Readme: README.md
- Contributing: CONTRIBUTING.md
- Code of conduct: CODE_OF_CONDUCT.md
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README

          # Concurrent React

> Improving UX with a faster, more predictable app.

> A NEW version of this project is available at:

> https://github.com/kentcdodds/react-suspense

👋 hi there! My name is [Kent C. Dodds](https://kentcdodds.com)! This is a

workshop repo to teach you the fundamentals of React's (EXPERIMENTAL)

[concurrent mode](https://reactjs.org/concurrent). This feature enables React to

make your app faster out of the box and it comes along with a few features that

you can use to improve your app's user experience (most notably the concept of

"Suspense").

[![Build Status][build-badge]][build]

[![AppVeyor Build Status][win-build-badge]][win-build]

[![Code Coverage][coverage-badge]][coverage]

[![GPL 3.0 License][license-badge]][license]

[![All Contributors](https://img.shields.io/badge/all_contributors-1-orange.svg?style=flat-square)](#contributors-)

[![PRs Welcome][prs-badge]][prs] [![Code of Conduct][coc-badge]][coc]

## ⚠️ Warning ⚠️

This workshop material deals with **EXPERIMENTAL** features in React. Please do

not copy/paste any of the code you find here into a production application and

expect it to work. Even when the features are released they may not work the

same as demonstrated in this workshop material.

That said, the concepts in this workshop will very likely be applicable when

these features are stable, so enjoy the workshop!

## Pre-Workshop Instructions/Requirements

In order for us to maximize our efforts during the workshop, please do the

following:

- [ ] Setup the project (follow the setup instructions below) (~5 minutes)

- [ ] Install and setup [Zoom](https://zoom.us) on the computer you will be

      using (~5 minutes)

- [ ] Install the React DevTools

      ([Chrome](https://chrome.google.com/webstore/detail/react-developer-tools/fmkadmapgofadopljbjfkapdkoienihi?hl=en)

      (recommended),

      [Firefox](https://addons.mozilla.org/en-US/firefox/addon/react-devtools/))

- [ ] Watch

      [Use Zoom for KCD Workshops](https://egghead.io/lessons/egghead-use-zoom-for-kcd-workshops)

      (~8 minutes).

- [ ] Watch

      [Setup and Logistics for KCD Workshops](https://egghead.io/lessons/egghead-setup-and-logistics-for-kcd-workshops)

      (~24 minutes). Please do NOT skip this step.

- [ ] Watch Dan Abramov's talk

      [Beyond React 16 | JSConf Iceland 2018](https://www.youtube.com/watch?v=nLF0n9SACd4)

      (33 minutes)

- [ ] Go through my

      [Learn React Hooks Workshop](https://kentcdodds.com/workshops/hooks), or

      have the equivalent basic experience of using hooks. You should be

      experienced with `useState`, `useEffect`, and `useRef`.

- [ ] Go through my

      [Advanced React Hooks Workshop](https://kentcdodds.com/workshops/advanced-react-hooks),

      or have the equivalent experience. You should be experienced with

      `useContext` and `useReducer` (experience with `useMemo` and `useCallback`

      is a bonus).

The more prepared you are for the workshop, the better it will go for you.

## Workshop Outline

Here are the concepts we'll be covering:

- Opting into React Concurrent Mode

- Thinking in Suspense

- The fundamentals of "suspending"

- Structuring `` components with fallbacks

- Using `useTransition`

- Refactor an existing async interaction to suspense

- The difference between the three data-fetching approaches:

  - Fetch-on-Render (not using Suspense)

  - Fetch-Then-Render (not using Suspense)

  - Render-as-You-Fetch (using Suspense)

- Using `` to coordinate multiple suspending components

## System Requirements

- [git][git] v2 or greater

- [NodeJS][node] v8 or greater

- [yarn][yarn] v1 or greater (or [npm][npm] v6 or greater)

All of these must be available in your `PATH`. To verify things are set up

properly, you can run this:

```shell

git --version

node --version

yarn --version # or npm --version

```

If you have trouble with any of these, learn more about the PATH environment

variable and how to fix it here for [windows][win-path] or

[mac/linux][mac-path].

## Setup

For many of my workshops, you should be able to run them

[entirely in the browser](https://codesandbox.io/s/github/kentcdodds/concurrent-react).

However for this one, I recommend you work through the workshop on your own

computer.

To do so, please follow these instructions.

After you've made sure to have the correct things (and versions) installed (as

indicated above), you should be able to just run a few commands to get set up:

```

git clone https://github.com/kentcdodds/concurrent-react.git

cd concurrent-react

npm run setup --silent

```

This may take a few minutes. **It will ask you for your email.** This is

optional and just automatically adds your email to the links in the project to

make filling out some forms easier If you get any errors, please read through

them and see if you can find out what the problem is. You may also want to look

at [Troubleshooting](#troubleshooting). If you can't work it out on your own

then please [file an issue][issue] and provide _all_ the output from the

commands you ran (even if it's a lot).

## Running the app

To get the app up and running (and really see if it worked), run:

```shell

npm start

```

This should start up your browser. If you're familiar, this is a standard

[react-scripts](https://github.com/facebook/create-react-app) application.

You can also open

[the deployment of the app on Netlify](https://concurrent-react.netlify.com/).

## Running the tests

```shell

npm test

```

This will start [Jest](http://facebook.github.io/jest) in watch mode. Read the

output and play around with it.

**Your goal will be to go into each test, swap the final version for the

exercise version in the import, and make the tests pass**

## Helpful Emoji 🐨 💰 💯 🦉 📜 💣 🚨

Each exercise has comments in it to help you get through the exercise. These fun

emoji characters are here to help you.

- **Kody the Koala Bear** 🐨 will tell you when there's something specific you

  should do

- **Marty the Money Bag** 💰 will give you specific tips (and sometimes code)

  along the way

- **Hannah the Hundred** 💯 will give you extra challenges you can do if you

  finish the exercises early.

- **Olivia the Owl** 🦉 will give you useful tidbits/best practice notes and a

  link for elaboration and feedback.

- **Dominic the Document** 📜 will give you links to useful documentation

- **Berry the Bomb** 💣 will be hanging around anywhere you need to blow stuff

  up (delete code)

- **Peter the Product Manager** 👨‍💼 helps us know what our users want

- **Alfred the Alert** 🚨 will occasionally show up in the test failures with

  potential explanations for why the tests are failing.

## Troubleshooting

"npm run setup" command not working

Here's what the setup script does. If it fails, try doing each of these things

individually yourself:

```

# verify your environment will work with the project

node ./scripts/verify

# install dependencies

npm install

# verify the project is ready to run

npm run build

npm run test:coverage

npm run lint

# automatically fill in your email for the feedback links.

node ./scripts/autofill-feedback-email.js

```

If any of those scripts fail, please try to work out what went wrong by the

error message you get. If you still can't work it out, feel free to [open an

issue][issue] with _all_ the output from that script. I will try to help if I

can.

## Contributors

Thanks goes to these wonderful people

([emoji key](https://github.com/kentcdodds/all-contributors#emoji-key)):

  

    
_{Kent C. Dodds}
💻 📖 🚇 ⚠️

  

This project follows the

[all-contributors](https://github.com/kentcdodds/all-contributors)

specification. Contributions of any kind welcome!

## License

This material is available for private, non-commercial use under the

[GPL version 3](http://www.gnu.org/licenses/gpl-3.0-standalone.html). If you

would like to use this material to conduct your own workshop, please contact me

at kent@doddsfamily.us

[npm]: https://www.npmjs.com/

[node]: https://nodejs.org

[git]: https://git-scm.com/

[yarn]: https://yarnpkg.com/

[build-badge]:

  https://img.shields.io/travis/com/kentcdodds/concurrent-react.svg?style=flat-square&logo=travis

[build]: https://travis-ci.com/kentcdodds/concurrent-react

[license-badge]:

  https://img.shields.io/badge/license-GPL%203.0%20License-blue.svg?style=flat-square

[license]:

  https://github.com/kentcdodds/concurrent-react/blob/master/README.md#license

[prs-badge]:

  https://img.shields.io/badge/PRs-welcome-brightgreen.svg?style=flat-square

[prs]: http://makeapullrequest.com

[coc-badge]:

  https://img.shields.io/badge/code%20of-conduct-ff69b4.svg?style=flat-square

[coc]:

  https://github.com/kentcdodds/concurrent-react/blob/master/CODE_OF_CONDUCT.md

[github-watch-badge]:

  https://img.shields.io/github/watchers/kentcdodds/concurrent-react.svg?style=social

[github-watch]: https://github.com/kentcdodds/concurrent-react/watchers

[github-star-badge]:

  https://img.shields.io/github/stars/kentcdodds/concurrent-react.svg?style=social

[github-star]: https://github.com/kentcdodds/concurrent-react/stargazers

[twitter]:

  https://twitter.com/intent/tweet?text=Check%20out%20concurrent-react%20by%20@kentcdodds%20https://github.com/kentcdodds/concurrent-react%20%F0%9F%91%8D

[twitter-badge]:

  https://img.shields.io/twitter/url/https/github.com/kentcdodds/concurrent-react.svg?style=social

[emojis]: https://github.com/kentcdodds/all-contributors#emoji-key

[all-contributors]: https://github.com/kentcdodds/all-contributors

[win-path]:

  https://www.howtogeek.com/118594/how-to-edit-your-system-path-for-easy-command-line-access/

[mac-path]: http://stackoverflow.com/a/24322978/971592

[issue]: https://github.com/kentcdodds/concurrent-react/issues/new

[win-build-badge]:

  https://img.shields.io/appveyor/ci/kentcdodds/concurrent-react.svg?style=flat-square&logo=appveyor

[win-build]: https://ci.appveyor.com/project/kentcdodds/concurrent-react

[coverage-badge]:

  https://img.shields.io/codecov/c/github/kentcdodds/concurrent-react.svg?style=flat-square

[coverage]: https://codecov.io/github/kentcdodds/concurrent-react

[watchman]: https://facebook.github.io/watchman/docs/install.html
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