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feat: add useComponentWillReceiveUpdate #24

Merged
merged 10 commits into from
Oct 11, 2024
67 changes: 67 additions & 0 deletions docs/src/pages/use-component-will-receive-update.mdx
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---
title: useComponentWillReceiveUpdate
---

# useComponentWillReceiveUpdate

import ExportMetaInfo from '../components/export-meta-info';

<ExportMetaInfo />

Change states based on changed props during a re-render. The name of the hook comes from [`UNSAFE_componentWillReceiveProps` method of class components](https://react.dev/reference/react/Component#unsafe_componentwillreceiveprops).

## Usage

```js
import { useComponentWillReceiveUpdate } from 'foxact/use-abortable-effect';

function Component(props) {
const [a, setA] = useState('')
const [b, setB] = useState('')
// when props.x changed, only reset a, not b
useComponentWillReceiveUpdate(() => {
setA('')
}, [props.x]);
}
```

If you're using useEffect like this:

```js
const [state, setState] = useState(false)
useEffect(() => setState(false), [props.someProp])
```

Don't do it. See [Adjusting some state when a prop changes](https://react.dev/learn/you-might-not-need-an-effect#adjusting-some-state-when-a-prop-changes) or [Storing information from previous renders](https://react.dev/reference/react/useState#storing-information-from-previous-renders)
It should be like this:
```js
const [prev, setPrev] = useState(state)
if (prev !== state) {
setPrev(state)
setState(false)
}
```

This hook is a helper for the above pattern.

```js
useComponentWillReceiveUpdate(() => setState(false), [state])
```

This only applies to states of the current component.
Modifying states from other components causes React reporting errors.
You may also want to read [(Avoid) Notifying parent components about state changes](https://react.dev/learn/you-might-not-need-an-effect#notifying-parent-components-about-state-changes) and [(Avoid) Passing data to the parent](https://react.dev/learn/you-might-not-need-an-effect#passing-data-to-the-parent).
If you need to edit other components' states, write it like this:
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```js
import { flushSync } from 'react-dom'

useComponentWillReceiveUpdate(() => {
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// Force React to immediately flush scheduled/batched updates
flushSync(() => setLocalState(false))
// By the time flushSync finishes and reaches this line, the DOM update
// for local state change has finished, you can now safely trigger parent
// components' re-render.
props.setParentState(false)
}, [state])
```
18 changes: 18 additions & 0 deletions src/use-component-will-receive-update/index.ts
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import { useState } from 'react';

/**
* @see {https://foxact.skk.moe/use-component-will-receive-update}
*/
export function useComponentWillReceiveUpdate(callback: () => void, deps: readonly unknown[]) {
deps = [...deps];
const [prev, setPrev] = useState(deps);
let changed = deps.length !== prev.length;
for (let i = 0; i < deps.length; i += 1) {
if (changed) break;
if (prev[i] !== deps[i]) changed = true;
}
if (changed) {
setPrev(deps);
callback();
}
}