no-unnecessary-use-memo

Full Name in eslint-plugin-react-hooks-extra

react-hooks-extra/no-unnecessary-use-memo

Full Name in @eslint-react/eslint-plugin

@eslint-react/hooks-extra/no-unnecessary-use-memo

Features

🔍

What it does

Disallows unnecessary usage of useMemo.

Why is this bad?

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

Examples

Failing

import React, { useMemo } from "react";
import { Button, MantineTheme } from "@mantine/core";
 
function Example() {
  const style = useMemo(
    (theme: MantineTheme) => ({
      input: {
        fontFamily: theme.fontFamilyMonospace,
      },
    }),
    []
  );
  return <Button sx={style} />;
}

Passing

import React from "react";
import { Button, MantineTheme } from "@mantine/core";
 
const style = (theme: MantineTheme) => ({
  input: {
    fontFamily: theme.fontFamilyMonospace,
  },
});
 
function Example() {
  return <Button sx={style} />;
}

no-unnecessary-use-callback no-useless-custom-hooks