no-generic-names.js

module.exports = {
    meta: {
        type: "suggestion",
        docs: {
            description: "disallow generic variable names to promote descriptive naming",
            category: "Stylistic Issues",
            recommended: false,
            url: "https://github.com/yourusername/eslint-plugin-yourpluginname/blob/main/docs/rules/no-generic-names.md"
        },
        schema: [],
        messages: {
            genericName: "Avoid generic variable names. '{{name}}' is too generic."
        }
    },

    create(context) {
        const genericNames = ["data", "item", "obj", "arr", "num", "str", "val", "info", "list", "el", "element"];

        return {
            VariableDeclarator(node) {
                if (genericNames.includes(node.id.name)) {
                    context.report({
                        node: node.id,
                        messageId: 'genericName',
                        data: {
                            name: node.id.name
                        }
                    });
                }
            }
        };
    }
};

test-no-generic-names.js

const rule = require('../../../lib/rules/no-generic-names');
const { RuleTester } = require('eslint');

const ruleTester = new RuleTester({
    parserOptions: { ecmaVersion: 2020 }
});

ruleTester.run('no-generic-names', rule, {
    valid: [
        'const userData = fetchUserData();',
        'const menuItem = getMenuItems();',
        'const userPosts = getUserPosts();',
        'const configObject = getConfigurations();'
    ],
    invalid: [
        {
            code: 'const data = fetchData();',
            errors: [
                { message: "Avoid generic variable names. 'data' is too generic." }
            ]
        },
        {
            code: 'const item = getItem();',
            errors: [
                { message: "Avoid generic variable names. 'item' is too generic." }
            ]
        },
        {
            code: 'const arr = getArray();',
            errors: [
                { message: "Avoid generic variable names. 'arr' is too generic." }
            ]
        },
        {
            code: 'const obj = getObject();',
            errors: [
                { message: "Avoid generic variable names. 'obj' is too generic." }
            ]
        }
    ]
});