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[React 19] Different behaviors with `preload` method
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上游 issue 正文
## Summary
- react & react-dom version: `19.0.0-rc-3563387fe3-20240621`
- node version: `20.14.0`
When using react's preload method, the preload link tag is not created in certain cases.
It works correctly with two link tags (`OnlyLinkTags` component).
### Code example
```js
const fs = require('node:fs');
const { createElement } = require('react');
const { preload, preinit } = require('react-dom');
const { renderToString } = require('react-dom/server');
const CSS = '/some.css';
const LINK_PROPS = {
rel: 'stylesheet',
href: CSS,
};
/**
* Doesn't create the preload link tag
*/
const PreloadAndPreinit = () => {
preload(CSS, { as: 'style' });
preinit(CSS, { as: 'style' });
return null;
};
/**
* Doesn't create the preload link tag
*/
const PreloadAndLinkWithPrecedence = () => {
preload(CSS, { as: 'style' });
return createElement('link', { ...LINK_PROPS, precedence: 'custom' });
};
/**
* Creates the preload link tag correctly into the head
* The stylesheet link tag stays in the body, because it doesn't have precedence
*/
const PreloadAndLinkWithoutPrecedence = () => {
preload(CSS, { as: 'style' });
return createElement('link', LINK_PROPS);
};
/**
* Moves both tags into the head
*/
const OnlyLinkTags = () => [
createElement('link', {
key: 'preload',
rel: 'preload',
as: 'style',
href: CSS,
}),
createElement('link', { ...LINK_PROPS, key: 'link', precedence: 'custom' }),
];
[
PreloadAndPreinit,
PreloadAndLinkWithPrecedence,
PreloadAndLinkWithoutPrecedence,
OnlyLinkTags,
].forEach((Component) => {
fs.writeFileSync(
`_${Component.name}.html`,
renderToString(
createElement(
'html',
null,
createElement('head'),
createElement('body', null, createElement(Component)),
),
),
);
});
```
### Outputs:
#### PreloadAndPreinit:
```jsx
preload("/some.css", { as: 'style' });
preinit("/some.css", { as: 'style' });
```
**Current:**
```html
<html>
<head>
<link rel="styleshe…
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