eslint-plugin-complete/dist/rules/no-for-in.js

An ESLint plugin that contains useful rules.

import { createRule } from "../utils.js";
export const noForIn = createRule({
    name: "no-for-in",
    meta: {
        type: "problem",
        docs: {
            description: 'Disallows "for x in y" statements',
            recommended: true,
            requiresTypeChecking: false,
        },
        schema: [],
        messages: {
            noForIn: 'for..in loops iterate over the entire prototype chain, which is virtually never what you want. Use a "for of" loop instead.',
        },
    },
    defaultOptions: [],
    create(context) {
        return {
            ForInStatement(node) {
                context.report({
                    node,
                    messageId: "noForIn",
                });
            },
        };
    },
});