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Stacked on #26570 Previously we restricted Float methods to only being callable while rendering. This allowed us to make associations between calls and their position in the DOM tree, for instance hoisting preinitialized styles into a ShadowRoot or an iframe Document. When considering how we are going to support Flight support in Float however it became clear that this restriction would lead to compromises on the implementation because the Flight client does not execute within the context of a client render. We want to be able to disaptch Float directives coming from Flight as soon as possible and this requires being able to call them outside of render. this patch modifies Float so that its methods are callable anywhere. The main consequence of this change is Float will always use the Document the renderer script is running within as the HoistableRoot. This means if you preinit as style inside a component render targeting a ShadowRoot the style will load in the ownerDocument not the ShadowRoot. Practially speaking it means that preinit is not useful inside ShadowRoots and iframes. This tradeoff was deemed acceptable because these methods are optimistic, not critical. Additionally, the other methods, preconntect, prefetchDNS, and preload, are not impacted because they already operated at the level of the ownerDocument and really only interface with the Network cache layer. I added a couple additional fixes that were necessary for getting tests to pass that are worth considering separately. The first commit improves the diff for `waitForThrow` so it compares strings if possible. The second commit makes invokeGuardedCallback not use metaprogramming pattern and swallows any novel errors produced from trying to run the guarded callback. Swallowing may not be the best we can do but it at least protects React against rapid failure when something causes the dispatchEvent to throw.
react-dom
This package serves as the entry point to the DOM and server renderers for React. It is intended to be paired with the generic React package, which is shipped as react to npm.
Installation
npm install react react-dom
Usage
In the browser
import { createRoot } from 'react-dom/client';
function App() {
return <div>Hello World</div>;
}
const root = createRoot(document.getElementById('root'));
root.render(<App />);
On the server
import { renderToPipeableStream } from 'react-dom/server';
function App() {
return <div>Hello World</div>;
}
function handleRequest(res) {
// ... in your server handler ...
const stream = renderToPipeableStream(<App />, {
onShellReady() {
res.statusCode = 200;
res.setHeader('Content-type', 'text/html');
stream.pipe(res);
},
// ...
});
}
API
react-dom
See https://react.dev/reference/react-dom
react-dom/client
See https://react.dev/reference/react-dom/client