Scaling React.js Applications (short version)

Scaling React.js Applications Max Stoiber, @mxstbr Open Source Developer, Thinkmill

@mxstbr

KeystoneJS

ElementalUI

@mxstbr

@mxstbr 2. Architecture 3. Performance 1. What is Scalability?

“[Scalability] is the capability of a system to be enlarged…”
Wikipedia

@mxstbr Containers and Components

@mxstbr Structure

@mxstbr Traditionally grouped by type

@mxstbr react-app-by-type !"" css !"" actions # $"" NavBarActions.js !""
containers # $"" NavBar.js !"" constants # $"" NavBarConstants.js !"" components # $"" App.js $"" reducers $"" NavBarReducer.js

@mxstbr Group by feature instead

@mxstbr react-app-by-feature !"" css !"" containers # $"" NavBar #
!"" NavBar.js # !"" actions.js # !"" constants.js # $"" reducer.js $"" components $"" App.js

@mxstbr Easy renaming and moving

@mxstbr import { toggleNav } from ‘containers/NavBar/actions.js’;

@mxstbr import { toggleNav } from ‘containers/PrimaryNav/actions.js’;

@mxstbr Work in a single folder

@mxstbr Reusable components

@mxstbr Styling??

@mxstbr .header { /* … */ } .title { background-color:
yellow; } .footer { /* … */ } .title { border-color: blue; } Conﬂict! Naming

@mxstbr CSS Modules

@mxstbr import styles from ‘styles.css’; render() { return ( <div
className={styles.footer} /> ); }

@mxstbr .footer { /* … */ } .title { /*
… */ } .MyApp__footer__1co1k { /* … */ } .MyApp__title__2fgr5s { /* … */ }

@mxstbr .header { line-height: 1.5em; } a { line-height: 1.5em;
} .title { line-height: 1.5em; } Inheritance

@mxstbr .header { line-height: 1.5em; } .title { line-height: 1.5em;
} Inheritance .footer { line-height: 1em; } .title { line-height: 1em; } Conﬂict!

@mxstbr Reset Header Title Global Reset Reset Header Local Reset
Reset Title

@mxstbr PostCSS

@mxstbr PostCSS + postcss-autoreset

@mxstbr .header { line-height: 1.5em; } a { line-height: default;
} .title { line-height: default; }

@mxstbr react-app-by-feature !"" containers # $"" NavBar # !"" NavBar.js
# !"" actions.js # !"" constants.js # !"" styles.css # $"" reducer.js $"" components $"" App.js

@mxstbr Component Isolation!

@mxstbr Data Fetching??

@mxstbr redux-thunk?

@mxstbr function fetchData() { return (dispatch) => { dispatch(dataFetching()); fetch(‘myapi.com/‘,
(data) => { dispatch(dataFetched(data)); }); } }

@mxstbr function fetchData() { return (dispatch) => { dispatch(dataFetching()); fetch(‘myapi.com/‘,
(data) => { // TODO: Error handling dispatch(dataFetched(data)); }); } }

@mxstbr redux-saga

@mxstbr function* fetchData() { while (true) { yield take(FETCH_DATA); put(dataFetching());
const data = yield call(fetch(‘myapi.com/'); put(dataFetched(data)); } }

@mxstbr function* fetchData() { while (true) { yield take(FETCH_DATA); put(dataFetching());
const data = yield call(fetch(‘myapi.com/'); // TODO: Error handling put(dataFetched(data)); } }

@mxstbr <Clock /> <Timer />

@mxstbr <Clock onStartClick={ dipatch(startTimer()) } /> <Timer onStopClick={ dispatch(showTime()) }
/>

@mxstbr <Clock onStartClick={ dipatch(startClicked()) } /> <Timer onStopClick={ dispatch(stopClicked()) }
/>

@mxstbr function* connectClockToTimer() { while (true) { yield take(START_BUTTON_CLICKED); put(startTimer());
yield take(STOP_BUTTON_CLICKED); put(stopTimer()); put(showTimeOnClock()); } }

@mxstbr Decoupled Components

@mxstbr 2. Group ﬁles by feature 3. Isolate Styling 1.
Containers and Components 4. Use redux-saga

@mxstbr

@mxstbr shouldComponentUpdate

@mxstbr

@mxstbr class NavBar extends React.Component { shouldComponentUpdate(nextProps) { ????? }
}

@mxstbr class NavBar extends React.Component { shouldComponentUpdate(nextProps) { return nextProps
!== this.props; } }

@mxstbr { “username”: “@mxstbr” } { “username”: “@mxstbr” } !==

@mxstbr Deeply comparing objects is expensive

@mxstbr ImmutableJS

@mxstbr import { fromJS } from ‘immutable’; const state =
fromJS({ “username”: “@mxstbr” });

@mxstbr .equals fromJS({ “username”: “@mxstbr” }) fromJS({ “username”: “@mxstbr” })

@mxstbr Deeply comparing objects is cheap!

@mxstbr

Thanks for having me! Tweet comments/feedback to @mxstbr Come talk
to me!

Scaling React.js Applications (short version)

Scaling React.js Applications (short version)

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