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React 18 conditional support #1449

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React 18 conditional support #1449

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af52b8a
Draft React 18 alternative support
Apr 25, 2022
47912e2
Conditions wrong way around
Apr 25, 2022
f2bc39b
Promise based approach
May 1, 2022
503fd63
Changes
May 1, 2022
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3 changes: 1 addition & 2 deletions node_package/src/ReactOnRails.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -18,8 +18,7 @@ import type {
AuthenticityHeaders,
StoreGenerator
} from './types/index';
import reactHydrate from './reactHydrate';
import reactRender from './reactRender';
import { reactHydrate, reactRender } from './helpers/renderHelper';

/* eslint-disable @typescript-eslint/no-explicit-any */
type Store = any;
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7 changes: 3 additions & 4 deletions node_package/src/clientStartup.ts
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Expand Up @@ -9,8 +9,7 @@ import type {

import createReactOutput from './createReactOutput';
import {isServerRenderHash} from './isServerRenderResult';
import reactHydrate from './reactHydrate';
import reactRender from './reactRender';
import { reactHydrate, reactRender, canHydrate } from './helpers/renderHelper';

declare global {
interface Window {
Expand Down Expand Up @@ -152,8 +151,7 @@ function render(el: Element, railsContext: RailsContext): void {
}

// Hydrate if available and was server rendered
// @ts-expect-error potentially present if React 18 or greater
const shouldHydrate = !!(ReactDOM.hydrate || ReactDOM.hydrateRoot) && !!domNode.innerHTML;
const shouldHydrate = canHydrate && !!domNode.innerHTML;

const reactElementOrRouterResult = createReactOutput({
componentObj,
Expand Down Expand Up @@ -213,6 +211,7 @@ function unmount(el: Element): void {
const domNode = document.getElementById(domNodeId);
if(domNode === null){return;}
try {
// Might need updating? https://reactjs.org/blog/2022/03/08/react-18-upgrade-guide.html
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unmountComponentAtNode is considered legacy https://reactjs.org/docs/react-dom.html#unmountcomponentatnode but would need to store references to root instead if we were to update

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Please see #1466.

ReactDOM.unmountComponentAtNode(domNode);
} catch (e) {
console.info(`Caught error calling unmountComponentAtNode: ${e.message} for domNode`,
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12 changes: 12 additions & 0 deletions node_package/src/helpers/legacyRootHandler.ts
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@@ -0,0 +1,12 @@
import ReactDOM from 'react-dom';
import type { RootRenderFunction, RootHydrateFunction } from '../types';

export const canHydrate = !!ReactDOM.hydrate

export const hydrate: RootHydrateFunction = (domNode, reactElement) => {
return ReactDOM.hydrate(reactElement, domNode)
}

export const render: RootRenderFunction = (domNode, reactElement) => {
return ReactDOM.render(reactElement, domNode);
}
14 changes: 14 additions & 0 deletions node_package/src/helpers/modernRootHandler.ts
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@@ -0,0 +1,14 @@
// @ts-expect-error react-dom/client only available in React 18
// eslint-disable-next-line import/no-unresolved
import ReactDOM from 'react-dom/client';
import type { RootRenderFunction, RootHydrateFunction } from '../types';

export const canHydrate = !!ReactDOM.hydrateRoot;

export const hydrate: RootHydrateFunction = (domNode, reactElement) => ReactDOM.hydrateRoot(domNode, reactElement);

export const render: RootRenderFunction = (domNode, reactElement) => {
const root = ReactDOM.createRoot(domNode);
root.render(reactElement);
return root;
};
19 changes: 19 additions & 0 deletions node_package/src/helpers/renderHelper.ts
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@@ -0,0 +1,19 @@
import supportsReactCreateRoot from './supportsReactCreateRoot';
import * as legacyRootHandler from './legacyRootHandler';
import * as modernRootHandler from './modernRootHandler';


let toExport;

if (supportsReactCreateRoot) {
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This could be good based not only on React version but also some configuration option so it's an opt-in

toExport = legacyRootHandler;
} else {
toExport = modernRootHandler;
}
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Struggling to find a nicer way to get this going, can't think of a way to do a dynamic import and then reexport

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Would be fairly trivial with top-level await though 🤔


export const {
canHydrate,
hydrate: reactHydrate,
render: reactRender
} = toExport;

0 node_package/src/supportsReactCreateRoot.ts → ...ge/src/helpers/supportsReactCreateRoot.ts
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12 changes: 0 additions & 12 deletions node_package/src/reactHydrate.ts
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15 changes: 0 additions & 15 deletions node_package/src/reactRender.ts
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6 changes: 6 additions & 0 deletions node_package/src/types/index.ts
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Expand Up @@ -52,6 +52,10 @@ interface RenderFunction {

type ReactComponentOrRenderFunction = ReactComponent | RenderFunction;

type RootRenderFunction = (domNode: Element, reactElement: ReactElement) => void | Element | Component;

type RootHydrateFunction = RootRenderFunction;

export type { // eslint-disable-line import/prefer-default-export
ReactComponentOrRenderFunction,
ReactComponent,
Expand All @@ -61,6 +65,8 @@ export type { // eslint-disable-line import/prefer-default-export
StoreGenerator,
CreateReactOutputResult,
ServerRenderResult,
RootRenderFunction,
RootHydrateFunction,
}

export interface RegisteredComponent {
Expand Down