no-unnecessary-use-memo

Full Name in eslint-plugin-react-x

react-x/no-unnecessary-use-memo

Full Name in @eslint-react/eslint-plugin

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

Features

🧪

Description

Disallow unnecessary usage of useMemo.

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 MyComponent() {
  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 MyComponent() {
  return <Button sx={style} />;
}

no-unnecessary-use-memo

Description

Examples

Failing

Passing

Implementation

See Also

On this page