no-useless-use-memo

Reports useMemo calls whose result is already static enough to move outside the component.

Rule details Suggestion

This rule looks for useMemo calls whose callback returns a value that does not depend on component state, props, or other local render-time values. When that happens, the memo adds overhead without changing the result.

By default, the rule reports empty or omitted dependency arrays only when the returned value is static. Set dependencyMode to "aggressive" if you also want to report static callbacks even when the dependency list is not empty.

Static memos do not need a hook

If the value can live at module scope, the hook is just extra work on every render.

Options

Option	Type	Default	What it does
dependencyMode	string	"non-updating"	Chooses whether empty deps only, non-updating deps, or any static memo counts
environment	string	"roblox-ts"	Chooses which React package imports to track
staticGlobalFactories	string[]	Same as no-useless-use-spring	Names treated as static factories when they are otherwise free

Examples

Incorrect

import { useMemo } from "react";

const rotationConfiguration = useMemo(
  () => getAnimationConfiguration(SpringConfiguration.Sharp, AnimationLibrary.ReactSpring),
  [],
);

Correct

const rotationConfiguration = getAnimationConfiguration(
  SpringConfiguration.Sharp,
  AnimationLibrary.ReactSpring,
);

function Component({ theme }) {
  const config = useMemo(() => buildConfig(theme), [theme]);
  return config;
}

Related rules

no-unused-use-memo Reports discarded useMemo results

no-useless-use-spring Reports spring hooks with static inputs

React Docs: useMemo Official reference for useMemo