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React Patterns in Product Hunt Radoslav Stankov 08/07/2018

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Radoslav Stankov @rstankov blog.rstankov.com github.com/rstankov
 twitter.com/rstankov

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early 2014 jQuery spaghetti October 2014 Backbone February 2015 React & Rails May 2015 custom Flux

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early 2014 jQuery spaghetti October 2014 Backbone February 2015 React & Rails May 2015 custom Flux December 2015 Redux

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early 2014 jQuery spaghetti October 2014 Backbone February 2015 React & Rails May 2015 custom Flux December 2015 Redux January 2016 React-Router

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early 2014 jQuery spaghetti October 2014 Backbone February 2015 React & Rails May 2015 custom Flux December 2015 Redux January 2016 React-Router April 2016 Redux Ducks

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early 2014 jQuery spaghetti October 2014 Backbone February 2015 React & Rails May 2015 custom Flux December 2015 Redux January 2016 React-Router April 2016 Redux Ducks Febuary 2017 GraphQL

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October 2014 Backbone February 2015 React & Rails May 2015 custom Flux December 2015 Redux January 2016 React-Router April 2016 Redux Ducks Febuary 2017 GraphQL

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February 2015 React & Rails May 2015 custom Flux December 2015 Redux January 2016 React-Router April 2016 Redux Ducks Febuary 2017 GraphQL

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December 2015 Redux January 2016 React-Router April 2016 Redux Ducks Febuary 2017 GraphQL

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early 2014 jQuery spaghetti October 2014 Backbone February 2015 React & Rails May 2015 custom Flux December 2015 Redux January 2016 React-Router April 2016 Redux Ducks Febuary 2017 GraphQL

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components/ graphql/
 layouts/ lib/ modules/ pages/ styles/ types/ utils/
 config.js entry.js paths.js reducers.js routes.js

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components/ graphql/
 layouts/ lib/ modules/ pages/ styles/ types/ utils/
 config.js entry.js paths.js reducers.js routes.js

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 https://speakerdeck.com/rstankov/react-at-product-hunt-wad


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components/ graphql/
 layouts/ lib/ modules/ pages/ styles/ types/ utils/
 config.js entry.js paths.js reducers.js routes.js

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 https://speakerdeck.com/rstankov/graphql-at-product-hunt


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components/ graphql/
 layouts/ lib/ modules/ pages/ styles/ types/ utils/
 config.js entry.js paths.js reducers.js routes.js

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! Generic " Utility # Domain $ Pages 
 Component types


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! Generic " Utility # Domain 
 Component types


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! Generic " Utility # Domain 
 Component types


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Generic components

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components/ Font/
 index.js styles.css 
 
 Component as folder


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components/ Component/
 SubComponent/ Fragment.graphql Mutation.graphql icon.svg index.js styles.css utils.js 
 Component as folder


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components/ Font/
 index.js styles.css 
 
 Component as folder


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import * as React from "react"; import Font from "components/Font"; {text}

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components/Font/index.js import * as React from "react"; import styles from "./styles.css"; export function Text({ children }) { return ( {children} ); } 
 Functional components


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components/ Font/
 index.js styles.css 
 
 CSS Modules


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CSS // style.css .text { font-size: 14px; } CSS // component.js
 import styles from './styles.css';

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CSS // style.css .text { font-size: 14px; } CSS // component.js
 import styles from './styles.css';

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CSS // style.css .text { font-size: 14px; } CSS // component.js
 import styles from './styles.css'; CSS // style.css .text_3mRwv { font-size: 14px; } CSS // result.js 


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import * as React from "react"; import Font from "components/Font"; text // -> text

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import * as React from "react"; import Font from "components/Font"; text // -> text text // ->

text

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import * as React from "react"; import Font from "components/Font"; text // -> text text // ->

text

text // -> text

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import * as React from "react"; import Font from "components/Font"; text // -> text text // ->

text

text // -> text 
 Pass custom component as prop


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 Pass custom component as prop
 import * as React from "react"; import styles from "./styles.css"; export function Text({ component, children, ...props }) { Component = component || "span";
 return ( {children} ); } components/Font/index.js

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 Pass custom component as prop
 import * as React from "react"; import styles from "./styles.css"; export function Text({ component, children, ...props }) { Component = component || "span";
 return ( {children} ); } components/Font/index.js %

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import * as React from "react"; import styles from "./styles.css"; export function Text({ component, ...props }) { Component = component || "span"; return ; } 
 Pass custom component as prop
 & components/Font/index.js

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import * as React from "react"; import Font from "components/Font"; text // -> Text

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import * as React from "react"; import Font from "components/Font"; import styles from "./styles.css"; text // -> text 
 Pass extra class name


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import * as React from "react"; import styles from "./styles.css"; import classNames from "classnames"; export function Text({ component, className, ...props }) { Component = component || "span";
 return

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yarn install "classnames"

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import * as React from "react"; import styles from "./styles.css"; import classNames from "classnames"; export function Text({ component, className, ...props }) { Component = component || "span"; return ; } components/Font/index.js

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https://github.com/facebook/flow

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export type Topic = { id: number, image_uuid?: ?string, name: string, description?: string, followers_count: number, posts_count: number, slug: string, };

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function isFollowing(user: User, topic: Topic): boolean { return user.followedTopicsIds.indexOf(topic.id) !== -1; } 
 


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function isFollowing(user: User, topic: Topic): boolean { return user.followedTopicsIds.indexOf(topic.id) !== -1; } isFollowing(null, topic); isFollowing(user, null); isFollowing(user, somethingElse); 
 


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function isFollowing(user: User, topic: Topic): boolean { return user.followedTopicsIds.indexOf(topic.id) !== -1; } isFollowing(null, topic); isFollowing(user, null); isFollowing(user, somethingElse); 
 


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function isFollowing(user: User, topic: Topic): boolean { return user.followedTopicsIds.indexOf(topic.id) !== -1; } isFollowing(null, topic); isFollowing(user, null); isFollowing(user, somethingElse); const variable: number = isFollowing(user, topic);
 


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function isFollowing(user: User, topic: Topic): boolean { return user.followedTopicsIds.indexOf(topic.id) !== -1; } isFollowing(null, topic); isFollowing(user, null); isFollowing(user, somethingElse); const variable: number = isFollowing(user, topic);
 


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function isFollowing(user: User, topic: Topic): boolean { return user.followedTopicsIds.indexOf(topic.id) !== -1; } isFollowing(null, topic); isFollowing(user, null); isFollowing(user, somethingElse); const variable: number = isFollowing(user, topic);
 
 const variable: boolean = isFollowing(user, topic);

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function isFollowing(user: User, topic: Topic): boolean { return user.followedTopicsIds.indexOf(topic.id) !== -1; } isFollowing(null, topic); isFollowing(user, null); isFollowing(user, somethingElse); const variable: number = isFollowing(user, topic);
 
 const variable: boolean = isFollowing(user, topic); ' (

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class UserImage extends React.Component { props: | {| user: User, width: number, height: number |} | {| user: User, variant: "big" | "medium" | "small" |}; render() { /* ... */ } }

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class UserImage extends React.Component { props: | {| user: User, width: number, height: number |} | {| user: User, variant: "big" | "medium" | "small" |}; render() { /* ... */ } }

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/* @flow */ 
 import * as React from "react"; import styles from "./styles.css"; import classNames from "classnames"; type Props = { component: any, className?: string }; export function Text({ component, className, ...props }: Props) { Component = component || "span"; return (

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/* @flow */ import * as React from "react"; import classNames from "classnames"; import styles from "./styles.css"; type Props = { className?: ?string, color?: "black" | "grey" | "orange" | "silver" | "white" | "error", component?: any, size?: "xSmall" | "small" | "medium" | "large" | "xLarge", uppercase?: boolean, weight?: "light" | "normal" | "semiBold" | "bold" }; export default function Font({ className, color, component, size, uppercase, 
 Component packages
 components/Font/index.js

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weight?: "light" | "normal" | "semiBold" | "bold" }; export default function Font({ className, color, component, size, uppercase, weight, ...props }: Props) { const Component = component || "span"; const classes = classNames( styles.font, styles[color], styles[size], styles[weight], uppercase && styles.uppercase, className ); return ; } Font.Text = (props: Props) => ( 
 Component packages
 components/Font/index.js

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return ; } Font.Text = (props: Props) => ( ); Font.SecondaryText = (props: Props) => ( ); Font.Title = (props: Props) => ( ); Font.Featured = (props: Props) => ( ); Font.Headline = (props: Props) => ( ); 
 Component packages
 components/Font/index.js

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import Font from "components/Font";
 text text text text text 
 Component packages


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import Form from "components/Form"; 
 Component packages


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! Generic " Utility # Domain 
 Component types


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✅ Generic " Utility # Domain 
 Component types


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✅ Generic " Utility # Domain 
 Component types


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Utility components

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/* @flow */ import * as React from 'react'; import { throttle } from 'lodash'; type Props = { onResize: ({| height: number, width: number |}) => void, }; export default class WindowResize extends React.Component { componentDidMount() { this.handleResize(); window.addEventListener('resize', this.handleResize); } componentWillUnmount() { window.removeEventListener('resize', this.handleResize); } shouldComponentUpdate() { 
 Renderless components
 components/WindowResize/index.js

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window.addEventListener('resize', this.handleResize); } componentWillUnmount() { window.removeEventListener('resize', this.handleResize); } shouldComponentUpdate() { return false; } render() { return null; } handleResize = throttle(() => { this.props.onResize({ height: window.innerHeight, width: window.innerWidth, }); }, 500); } 
 Renderless components
 components/WindowResize/index.js

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 Function as props
 
 {error => {error}}

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/* @flow */ import classNames from "classnames"; import * as React from "react"; import styles from "./styles.css"; import { formContextTypes, getErrorMessage } from "./utils"; import type { FormContextType } from "./types"; type Props = { name: string, children?: Function }; export default function ErrorMessage( { name, children }: Props, { form }: FormContextType ) { const message = getErrorMessage(form, name); if (!message) { return null; 
 Function as props
 components/Form/ErrorMessage/index.js

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children?: Function }; export default function ErrorMessage( { name, children }: Props, { form }: FormContextType ) { const message = getErrorMessage(form, name); if (!message) { return null; } if (typeof children === "function") { return children(message) || null; } return {message}; } ErrorMessage.defaultProps = { name: "base"}; ErrorMessage.contextTypes = formContextTypes; 
 Function as props
 components/Form/ErrorMessage/index.js

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 {currentTime => ( )} 
 Function as props


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/* @flow */ import * as React from "react"; import moment from "moment"; import type { Moment } from "types/Moment"; type Props = { children: (time: Moment) => any }; type State = { time: Moment }; export default class Clock extends React.Component { state = { time: moment() }; intervalId = null; componentDidMount() { this.updateTime(); 
 Function as props
 components/Clock/index.js

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time: Moment }; export default class Clock extends React.Component { state = { time: moment() }; intervalId = null; componentDidMount() { this.updateTime(); if (!this.intervalId) { this.intervalId = setInterval(this.updateTime, 1000); } } componentWillUnmount() { if (this.intervalId) { clearInterval(this.intervalId); this.intervalId = null; } } updateTime = () => { 
 Function as props
 components/Clock/index.js

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this.updateTime(); if (!this.intervalId) { this.intervalId = setInterval(this.updateTime, 1000); } } componentWillUnmount() { if (this.intervalId) { clearInterval(this.intervalId); this.intervalId = null; } } updateTime = () => { this.setTime({ time: moment() }); }; render() { return this.children(this.state.time); } } 
 Function as props
 components/Clock/index.js

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{isLoggedIn => (isLoggedIn ? : )}

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{isMobile => (isMobile ? : )}

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✅ Generic " Utility # Domain 
 Component Types


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✅ Generic ✅ Utility # Domain 
 Component Types


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✅ Generic ✅ Utility # Domain 
 Component Types


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Domain components

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/* @flow */ import * as React from "react"; import Font from "components/Font"; import Link from "components/Link"; import TopicFollowButton from "components/TopicFollowButton"; import TopicImage from "components/TopicImage"; import classNames from "classNames"; import paths from "paths"; import styles from "./styles.css"; import type { TopicItemFragament as Topic } from "graphql/schema.js"; type Props = { topic: Topic, className?: string }; export default function TopicItem({ topic, className }: Props) { return (
components/TopicItem/index.js 
 Domain component


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type Props = { topic: Topic, className?: string }; export default function TopicItem({ topic, className }: Props) { return (
{topic.name} {topic.description}
); } components/TopicItem/index.js 
 Domain component


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components/ TopicItem/
 Fragment.graphql index.js styles.css 
 Component as folder


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#import "components/TopicFollowButton/Fragment.graphql" #import "components/TopicImage/Fragment.graphql" fragment TopicItem on Topic { id name slug description ...TopicFollowButton ...TopicImage } components/TopicItem/Fragment.graphql 
 GraphQL fragment


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TopicItem TopicImage TopicFollowButton

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components/ TopicFollowButton/
 Fragment.graphql Mutation.graphql index.js styles.css 
 Component as folder


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fragment TopicFollowButton on Topic { id name isFollowed } 
 GraphQL fragment
 components/TopicFollowButton/Fragment.graphql

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mutation TopicFollowToggle($input: TopicFollowToggleInput!) { topicFollowToggle(input: $input) { node {
 id isFollowed
 } } } components/TopicItem/Mutation.graphql 
 GraphQL mutation


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/* @flow */ import * as React from "react"; import Button from "ph/components/Button"; import MUTATION from "./Mutation.graphql"; import openLogin from "ph/utils/openLogin"; import type { TopicButtonFragament as Topic } from "ph/graphql/ schema.js"; import { createContainer } from "ph/lib/container"; import { graphql } from "react-apollo"; type Props = { className?: string, isLogged: boolean, topic: Topic, toggleFollow: Function }; export class TopicFollowButton extends React.Component { render() { const isFollowed = this.props.topic.isFollowed; 
 Action button
 components/TopicItem/index.graphql

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topic: Topic, toggleFollow: Function }; export class TopicFollowButton extends React.Component { render() { const isFollowed = this.props.topic.isFollowed; return ( {isFollowed ? "Following" : "Follow"} ); } handleClick: Function = async () => { if (this.props.isLogged) { this.props.toggleFollow(!this.props.topic.isFollowed); } else { openLogin({ reason: `Follow ${this.props.topic.name}` }); 
 Action button
 components/TopicItem/index.graphql

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); } handleClick: Function = async () => { if (this.props.isLogged) { this.props.toggleFollow(!this.props.topic.isFollowed); } else { openLogin({ reason: `Follow ${this.props.topic.name}` }); } }; } export default createContainer({ renderComponent: TopicFollowButton, decorators: [ graphql(MUTATION, { props: ({ ownProps, mutate }) => ({ toggleFollow(follow) { return mutate({ variables: { input: { id: ownProps.topic.id, follow: follow } } }); } 
 Action button
 components/TopicItem/index.graphql

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export default createContainer({ renderComponent: TopicFollowButton, decorators: [ graphql(MUTATION, { props: ({ ownProps, mutate }) => ({ toggleFollow(follow) { return mutate({ variables: { input: { id: ownProps.topic.id, follow: follow } } }); } }) }) ], mapStateToProps({ currentUser }) { return { isLogged: currentUser.id }; } }); 
 Action button
 components/TopicItem/index.graphql

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}> }>

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TopicPage TopicItem TopicImage TopicFollowButton

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✅ Generic ✅ Utility # Domain 
 Component Types


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✅ Generic ✅ Utility ✅ Domain 
 Component Types


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✅ Generic ✅ Utility ✅ Domain 
 Component Types


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Thanks '

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 https://github.com/rstankov/talks-code