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Add experimental Suspense support (#153)
* Add experimental Suspense support. * Add PropType and type definition. * Skip Suspense test when running against 16.3. * Lock down all version ranges. * Fix eslint config. * Disable rules of hooks for examples. * Attempt at fixing CircleCI memory issue. * Update lockfile. * Bump deps. * Revert "Disable rules of hooks for examples." This reverts commit d3d931a.
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‎README.md

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@@ -138,6 +138,7 @@ React Async has no direct relation to Concurrent React. They are conceptually cl
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meant to make dealing with asynchronous business logic easier. Concurrent React will make those features have less
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impact on performance and usability. When Suspense lands, React Async will make full use of Suspense features. In fact,
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you can already **start using React Async right now**, and in a later update, you'll **get Suspense features for free**.
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In fact, React Async already has experimental support for Suspense, by passing the `suspense` option.
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[concurrent react]: https://github.com/sw-yx/fresh-concurrent-react/blob/master/Intro.md#introduction-what-is-concurrent-react
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@@ -441,6 +442,7 @@ These can be passed in an object to `useAsync()`, or as props to `<Async>` and c
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- `reducer` State reducer to control internal state updates.
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- `dispatcher` Action dispatcher to control internal action dispatching.
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- `debugLabel` Unique label used in DevTools.
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- `suspense` Enable **experimental** Suspense integration.
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`useFetch` additionally takes these options:
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@@ -557,6 +559,22 @@ dispatcher at some point.
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A unique label to describe this React Async instance, used in React DevTools (through `useDebugValue`) and React Async
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DevTools.
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#### `suspense`
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> `boolean`
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Enables **experimental** Suspense integration. This will make React Async throw a promise while loading, so you can use
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Suspense to render a fallback UI, instead of using `<IfPending>`. Suspense differs in 2 main ways:
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- `<Suspense>` should be an ancestor of your Async component, instead of a descendant. It can be anywhere up in the
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component hierarchy.
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- You can have a single `<Suspense>` wrap multiple Async components, in which case it will render the fallback UI until
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all promises are settled.
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> Note that the way Suspense is integrated right now may change. Until Suspense for data fetching is officially
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> released, we may make breaking changes to its integration in React Async in a minor or patch release. Among other
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> things, we'll probably add a cache of sorts.
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#### `defer`
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> `boolean`

‎examples/with-suspense/.env

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SKIP_PREFLIGHT_CHECK=true

‎examples/with-suspense/README.md

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# Basic fetch with Suspense
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This demonstrates how Suspense can be used to render a fallback UI while loading.
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<a href="https://react-async.async-library.now.sh/examples/with-suspense">
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<img src="https://img.shields.io/badge/live-demo-blue.svg" alt="live demo">
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</a>

‎examples/with-suspense/package.json

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{
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"name": "with-suspense-example",
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"version": "8.0.0",
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"private": true,
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"homepage": "https://react-async.async-library.now.sh/examples/with-suspense",
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"scripts": {
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"postinstall": "relative-deps",
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"prestart": "relative-deps",
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"prebuild": "relative-deps",
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"pretest": "relative-deps",
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"start": "react-scripts start",
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"build": "react-scripts build",
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"test": "react-scripts test",
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"now-build": "SKIP_PREFLIGHT_CHECK=true react-scripts build"
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},
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"dependencies": {
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"react": "16.10.1",
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"react-async": "8.0.0",
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"react-async-devtools": "8.0.0",
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"react-dom": "16.10.1",
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"react-scripts": "3.1.2"
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},
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"devDependencies": {
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"relative-deps": "0.1.2"
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},
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"relativeDependencies": {
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"react-async": "../../packages/react-async/pkg",
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"react-async-devtools": "../../packages/react-async-devtools/pkg"
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},
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"eslintConfig": {
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"extends": "react-app"
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},
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"browserslist": [
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">0.2%",
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"not dead",
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"not ie <= 11",
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"not op_mini all"
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],
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"engines": {
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"node": ">=8"
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}
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}

‎examples/with-suspense/public/favicon.ico

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‎examples/with-suspense/public/index.html

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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="utf-8" />
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<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no" />
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<meta name="theme-color" content="#000000" />
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<title>React App</title>
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</head>
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<body>
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<noscript> You need to enable JavaScript to run this app. </noscript>
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<div id="root"></div>
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</body>
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</html>

‎examples/with-suspense/src/index.css

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body {
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margin: 20px;
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padding: 0;
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font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto", "Oxygen", "Ubuntu",
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"Cantarell", "Fira Sans", "Droid Sans", "Helvetica Neue", sans-serif;
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-webkit-font-smoothing: antialiased;
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-moz-osx-font-smoothing: grayscale;
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}
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.user {
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display: inline-block;
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margin: 20px;
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text-align: center;
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}
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.avatar {
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background: #eee;
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border-radius: 64px;
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width: 128px;
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height: 128px;
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}
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.name {
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margin-top: 10px;
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}
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.placeholder {
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opacity: 0.5;
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}

‎examples/with-suspense/src/index.js

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import React, { Suspense } from "react"
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import { useAsync, IfFulfilled, IfRejected } from "react-async"
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import ReactDOM from "react-dom"
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import DevTools from "react-async-devtools"
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import "./index.css"
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const loadUser = ({ userId }) =>
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fetch(`https://reqres.in/api/users/${userId}`)
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.then(res => (res.ok ? res : Promise.reject(res)))
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.then(res => res.json())
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.then(({ data }) => data)
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const UserPlaceholder = () => (
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<div className="user placeholder">
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<div className="avatar" />
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<div className="name">══════</div>
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</div>
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)
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const UserDetails = ({ data }) => (
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<div className="user">
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<img className="avatar" src={data.avatar} alt="" />
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<div className="name">
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{data.first_name} {data.last_name}
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</div>
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</div>
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)
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const User = ({ userId }) => {
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const state = useAsync({
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suspense: true,
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promiseFn: loadUser,
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debugLabel: `User ${userId}`,
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userId,
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})
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return (
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<>
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<IfFulfilled state={state}>{data => <UserDetails data={data} />}</IfFulfilled>
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<IfRejected state={state}>{error => <p>{error.message}</p>}</IfRejected>
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</>
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)
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}
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export const App = () => (
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<>
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<DevTools />
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<Suspense
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fallback={
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<>
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<UserPlaceholder />
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<UserPlaceholder />
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</>
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}
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>
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<User userId={1} />
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<User userId={2} />
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</Suspense>
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</>
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)
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if (process.env.NODE_ENV !== "test") ReactDOM.render(<App />, document.getElementById("root"))

‎examples/with-suspense/src/index.test.js

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import React from "react"
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import ReactDOM from "react-dom"
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import { App } from "./"
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it("renders without crashing", () => {
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const div = document.createElement("div")
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ReactDOM.render(<App />, div)
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ReactDOM.unmountComponentAtNode(div)
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})

‎packages/react-async/src/Async.js

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}
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render() {
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const { children } = this.props
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const { children, suspense } = this.props
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if (suspense && this.state.isPending && this.promise !== neverSettle) {
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// Rely on Suspense to handle the loading state
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throw this.promise
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}
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if (typeof children === "function") {
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return <Provider value={this.state}>{children(this.state)}</Provider>
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}

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