fix: check whether oldDom is present in the DOM#4318
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JoviDeCroock merged 6 commits intomainfrom Apr 5, 2024
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Size Change: +42 B (0%) Total Size: 60.3 kB
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marvinhagemeister
approved these changes
Apr 5, 2024
This was referenced Apr 8, 2024
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@JoviDeCroock I'm experiencing the insertBefore error on the latest preact on a list that gets frequently changed. Unfortunately I cant provide a stable reproduction steps. |
Member
Author
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@bagratinho I'd love to have a reproduction but yes, nested fragments or components that just return children are fragment-like. |
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I started seeing errors similar to what @bagratinho is mentioning as well, and in my case is related to Google Chrome's auto translation. I put together a minimal reproduction that seems to trigger in the REPL env as well. This doesn't throw an error with 10.20.1, but does when using >=10.20.2 import { render, h } from 'preact';
import { useState, useEffect } from 'preact/hooks';
const Button = (props) => {
return (
<div>
<p>hello {props.label} there</p>
</div>
);
};
function App() {
const [, setValue] = useState(0);
useEffect(() => {
const interval = setInterval(() => setValue((v) => v + 1), 1000);
return () => clearInterval(interval);
}, []);
return (
<>
<h1>Hello</h1>
<Button label="Next" />
</>
);
}
render(<App />, document.getElementById('app'));
I narrowed it down to this tag for when the issue started happening https://github.com/preactjs/preact/releases/tag/10.20.2 so that's why I'm assuming this commit is related. Let me know if you want me to migrate this to an issue for better tracking |
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Thank you both for the input, I will try and look at the translate example. If you find one without it as the first message here implies please share 🙏 |
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@andrewburgess I would encourage you to try out #4409 if possible |
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@JoviDeCroock checked it out and seems to solve the issue, thanks for looking into it! |
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This was referenced Aug 14, 2024
This was referenced Sep 3, 2024
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Fixes #4194
This was a bit of a tricky one and haven't been able to reproduce this in tests but the base case looks like the following
The main issue is that in nested fragment-like children we can have a very deep chain of components where the last one eventually resolves to unmounting the children. This is problematic because we bubble back up to the
_parentwhere the_nextDom/oldDomis already set but can be unmounted by a laterFragment-likechild.This effectively means that _nextDom on all parents is going to be invalid, we however can't course-correct as we've already higher-up in the stack assigned oldDom which now in-turn can become invalid by the first call to diff.
My naive solution for this is to check
isConnectedand get a new DOM-Sibling, this re-checks the children and shouldn't come up with an old-node as we are post-diff. Open to any other solutions here.For debugging I copied the sandbox attached in the issue in our
demoand logged that way.