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Dealing with dependencies in JavaScript (like a champ !) Radoslav Stankov 31/10/2019

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Radoslav Stankov @rstankov http://rstankov.com http://github.com/rstankov

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https://speakerdeck.com/rstankov

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open ./node_modules

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" JavaScript Fatigue

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What framework to use? How to manage state? How to fetch data? Which router to use? Which calendar component to use? Which chart component to use?  ... #

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Agenda

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$ Dependency types % Picking dependencies & Handling dependencies

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Dependency types

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Medium easy  to change Big Medium Small Medium Small Small Small Small Small hard to change simple complex * totally unscientiﬁc chart '

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Medium easy  to change Big Medium Small Medium Small Small Small Small Small hard to change simple complex * totally unscientiﬁc chart '

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What framework to use? How to manage state? How to fetch data? Which router to use? Which calendar component to use? Which chart component to use?  ... #

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What framework to use? How to manage state? How to fetch data? Which router to use? Which calendar component to use? Which chart component to use?  ... #

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What ecosystem to choose? How to manage state? How to fetch data? Which router to use? Which calendar component use? Which chart component use?  ... #

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What ecosystem to choose? How to manage state? How to fetch data? Which router to use? Which calendar component use? Which chart component use?  ... #

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History of JS Ecosystem

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History of JS Ecosystem 2005

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History of JS Ecosystem 2005 2006

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History of JS Ecosystem 2005 2010 2006

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History of JS Ecosystem 2005 2010 2006

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History of JS Ecosystem 2005 2013 2010 2006

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History of JS Ecosystem 2005 2019 2013 2010 2006

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What ecosystem to choose? How to manage state? How to fetch data? Which router to use? Which calendar component use? Which chart component use?  ... #

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What ecosystem to choose? How to manage state? How to fetch data? Which router to use? Which calendar component use? Which chart component use?  ... #

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Medium easy  to change Big Medium Small Medium Small Small Small Small Small hard to change simple complex * totally unscientiﬁc chart '

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History of React Ecosystem 2013 2019

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History of React Ecosystem 2013 2019 2014

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History of React Ecosystem 2013 2019 2014 2015

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History of React Ecosystem 2013 2019 2014 2015

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History of React Ecosystem 2013 2019 2014 2015 2016

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History of React Ecosystem 2013 2019 2014 2015 2016 Concepts

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History of React Ecosystem 2013 2019 2014 2015 2016 Libraries

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History of React Ecosystem 2013 2019 2014 2015 2016

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What ecosystem to choose? How to manage state? How to fetch data? Which router to use? Which calendar component use? Which chart component use?  ... #

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Medium easy  to change Big Medium Small Medium Small Small Small Small Small hard to change simple complex * totally unscientiﬁc chart '

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Picking Dependencies

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⏹ Do we really need it? ⏹ Can something we already have do the task we are searching for? ⏹ Can we implement this ourselves? ⏹ Is this properly maintained? ⏹ Is it well documented? ⏹ When was the last version? ⏹ When was the last commit? ⏹ How often does it get a new version? ⏹ Does it have CHANGELOG? ⏹ Were there breaking changes recently? ⏹ Does it have security issues past or present? ⏹ How many dependencies does it come from? ⏹ What the dependency size? ⏹ What is its license? ⏹ Do you use this in any other project? ✅ Questions

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https://www.npmjs.com/package/lodash

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https://www.npmjs.com/package/lodash

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https://www.npmjs.com/package/draft-js

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https://github.com/facebook/draft-js

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https://github.com/facebook/draft-js/issues

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http://npm.broofa.com/?q=draft-js

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https://bundlephobia.com/result?p=draft-js@0.11.0

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Handling dependencies

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Who is developer worst enemy?

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* The designer Who is developer worst enemy?

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* The designer + The QA Who is developer worst enemy?

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* The designer + The QA , The sys admin Who is developer worst enemy?

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* The designer + The QA , The sys admin - The project owner Who is developer worst enemy?

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* The designer + The QA , The sys admin - The project owner . Santa Who is developer worst enemy?

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* The designer + The QA , The sys admin - The project owner . Santa / Code coupling Who is developer worst enemy?

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* The designer + The QA , The sys admin - The project owner . Santa / Code coupling Who is developer worst enemy?

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/ Code coupling

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// pages/Home/index.js import * as React from 'react'; import { Jumbotron } from 'react-bootstrap'; import { Link } from 'react-router'; import moment from 'moment'; import styles from './styles.css'; import globalStyles from 'styles/global.css'; import classNames from 'classNames'; import FancyTime from 'fancy-time' export default class Page extends React.Component { state = { time: new Date(), }; componentDidMount() { this.interval = setInterval(this.updateTime, 1000); } componentWillUnmount() { clearInterval(this.interval); this.interval = null; } updateTime = () => { this.setState({ time: new Date() }); } render() { const { time } = this.state.time; return (

Conference

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export default class Page extends React.Component { state = { time: new Date(), }; componentDidMount() { this.interval = setInterval(this.updateTime, 1000); } componentWillUnmount() { clearInterval(this.interval); this.interval = null; } updateTime = () => { this.setState({ time: new Date() }); } render() { const { time } = this.state.time; return (

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{moment(time).format('HH:mm')} Schedule Venue

); } }

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Reasons for change

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Component Dependency Dependency Dependency

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Component Dependency Dependency Dependency Component Component Dependency Dependency

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Component Component Component Dependency nent Comp Dependency Dependency Dependency Dependency Dependency Dependency Dep cy

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Control changes

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Component Dependency Dependency

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Component Dependency Dependency Component

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Component Dependency Dependency Component Component Component

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Time Moment FancyTime Page Page Page

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Conference

{moment(time).format('HH:mm')} Schedule Venue

); } }

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Conference

Schedule Venue

); } }

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// components/Time/index.js import * as React from 'react'; import classNames from 'classNames'; import styles from './styles.css'; import moment from 'moment'; import FancyTime from 'fancy-time'; export default function Time({ className, time }) { return ( {moment(time).format('HH:mm')} ); }

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Time Moment FancyTime Page Page Page

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Time Utils FancyTime Page Page Page Moment

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// components/Time/index.js import * as React from 'react'; import classNames from 'classNames'; import styles from './styles.css'; import { formatTime } from './utils'; import FancyTime from 'fancy-time'; export default function Time({ className, time }) { return ( {formatTime('clock')} ); } // components/Time/utils.js import moment from 'moment'; const FORMATS = { 'full': null, 'clock': 'HH:mm', }; export function formatTime(time, kind) { const format = FORMATS[kind] return moment(time).format(format); }

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// pages/Home/index.js import * as React from 'react'; import { Jumbotron } from 'react-bootstrap'; import { Link } from 'react-router'; import styles from './styles.css'; import globalStyles from 'styles/global.css'; import classNames from 'classNames';  import Time from 'components/Time'; export default class Page extends React.Component { state = { time: new Date(), }; componentDidMount() { this.interval = setInterval(this.updateTime, 1000); } componentWillUnmount() { clearInterval(this.interval); this.interval = null; } updateTime = () => { this.setState({ time: new Date() }); } render() { const { time } = this.state.time; return (

Conference

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Conference

{(time) => } Schedule Venue

); } }

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Conference

{(time) => } Schedule Venue

); } }

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// pages/Home/index.js import * as React from 'react'; import { Link } from 'react-router'; import Time from 'components/Time'; import Clock from 'components/Clock'; import Jumbotron from 'components/Jumbotron'; export default function Page() { return ( {(time) => } Schedule Venue ); }

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// paths.js export default { schedule() { return '/schedule'; }, venue() { return '/venue'; } };

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// pages/Home/index.js import * as React from 'react'; import { Link } from 'react-router'; import paths from 'paths'; import Time from 'components/Time'; import Clock from 'components/Clock'; import Jumbotron from 'components/Jumbotron'; export default function Page() { return ( {(time) => } Schedule Venue ); }

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// components/Link/index.js import { Link } from 'react-router'; export default function Link({ to, className, children }) { return ( {children} ); }

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// components/Link/index.js import { Link } from 'found'; export default function Link({ to, className, children }) { return ( {children} ); }