"How to read an often-changing value from useCallback?" doesn't seem idiomatic
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描述
Custom hooks that take dependency arrays don't seem idiomatic (maybe I'm wrong). The biggest reason for that is that the React hooks lint doesn't check dependency arrays for anything except the primitive hooks.
In particular, I'd propose changing this:
function useEventCallback(fn, dependencies) {
const ref = useRef(() => {
throw new Error('Cannot call an event handler while rendering.');
});
useEffect(() => {
ref.current = fn;
}, [fn, ...dependencies]);
return useCallback(() => {
const fn = ref.current;
return fn();
}, [ref]);
}
to
function useEventCallback(fn) {
const ref = useRef(() => {
throw new Error('Cannot call an event handler while rendering.');
});
useEffect(() => {
ref.current = fn;
}, [fn]);
return useCallback(() => {
const fn = ref.current;
return fn();
}, []);
}
// which should be used as
const callback = useEventCallback(useCallback((event) => {
/* ... */
}, [/* dependencies */]));
This is slightly more abstract but also less likely to cause footguns. Alternatively, it might just be better to create a new function every render and store it in the ref (no use of dependencies at all).
function useEventCallback(fn) {
const ref = useRef(() => {
throw new Error('Cannot call an event handler while rendering.');
});
// Note this runs unconditionally
useEffect(() => {
ref.current = fn;
});
return useCallback(() => {
const fn = ref.current;
return fn();
}, []);
}
// which should be used as
const callback = useEventCallback((event) => {
/* ... */
});
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调研方向
该 issue 提到了 useEventCallback 和 useCallback,并给出了两个可选的依赖数组示例,但没有指出 repository 文件或测试。首先定位涵盖这些 hooks 的文档或示例,然后确定应采用哪项指导,并使用达成一致的建议更新相关材料。
由索引模型根据 Issue 内容生成。
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