ensure-use-callback-has-non-empty-deps

Rule category

Pedantic.

What it does

Warns when useCallback is called with empty dependencies array.

Why is this bad?

React Hooks useCallback has empty dependencies array like what’s in the examples, are unnecessary. The hook can be removed and it’s value can be created in the component body or hoisted to the outer scope of the component.

Examples

Failing

import React, { function useCallback<T extends Function>(callback: T, deps: DependencyList): T`useCallback` will return a memoized version of the callback that only changes if one of the `inputs`
has changed.
@version16.8.0@see{@link https://react.dev/reference/react/useCallback}useCallback } from "react";
 
function function Example(): React.JSX.ElementExample() {
  // @warn: useCallback has empty dependencies array
 
  const const onClick: () => voidonClick = useCallback<() => void>(callback: () => void, deps: React.DependencyList): () => void`useCallback` will return a memoized version of the callback that only changes if one of the `inputs`
has changed.
@version16.8.0@see{@link https://react.dev/reference/react/useCallback}useCallback(() => {
    var console: Consoleconsole.Console.log(...data: any[]): void[MDN Reference](https://developer.mozilla.org/docs/Web/API/console/log_static)log("clicked");
  }, []);
 
  return <JSX.IntrinsicElements.button: React.DetailedHTMLProps<React.ButtonHTMLAttributes<HTMLButtonElement>, HTMLButtonElement>button React.ButtonHTMLAttributes<HTMLButtonElement>.type?: "button" | "submit" | "reset" | undefinedtype="button" React.DOMAttributes<HTMLButtonElement>.onClick?: React.MouseEventHandler<HTMLButtonElement> | undefinedonClick={const onClick: () => voidonClick} />;
}

Passing

import React from "react";
 
function function onClick(): voidonClick() {
  var console: Consoleconsole.Console.log(...data: any[]): void[MDN Reference](https://developer.mozilla.org/docs/Web/API/console/log_static)log("clicked");
}
 
function function Example(): React.JSX.ElementExample() {
  return <JSX.IntrinsicElements.button: React.DetailedHTMLProps<React.ButtonHTMLAttributes<HTMLButtonElement>, HTMLButtonElement>button React.ButtonHTMLAttributes<HTMLButtonElement>.type?: "button" | "submit" | "reset" | undefinedtype="button" React.DOMAttributes<HTMLButtonElement>.onClick?: React.MouseEventHandler<HTMLButtonElement> | undefinedonClick={function onClick(): voidonClick} />;
}

hooks-extra/ensure-custom-hooks-using-other-hooks hooks-extra/ensure-use-memo-has-non-empty-deps