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Viewing file:     guard-for-in.js (2.31 KB)      -rw-r--r--

/**
 * @fileoverview Rule to flag for-in loops without if statements inside
 * @author Nicholas C. Zakas
 */

"use strict";

//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------

/** @type {import('../shared/types').Rule} */
module.exports = {
    meta: {
        type: "suggestion",

        docs: {
            description: "Require `for-in` loops to include an `if` statement",
            recommended: false,
            url: "https://eslint.org/docs/latest/rules/guard-for-in"
        },

        schema: [],
        messages: {
            wrap: "The body of a for-in should be wrapped in an if statement to filter unwanted properties from the prototype."
        }
    },

    create(context) {

        return {

            ForInStatement(node) {
                const body = node.body;

                // empty statement
                if (body.type === "EmptyStatement") {
                    return;
                }

                // if statement
                if (body.type === "IfStatement") {
                    return;
                }

                // empty block
                if (body.type === "BlockStatement" && body.body.length === 0) {
                    return;
                }

                // block with just if statement
                if (body.type === "BlockStatement" && body.body.length === 1 && body.body[0].type === "IfStatement") {
                    return;
                }

                // block that starts with if statement
                if (body.type === "BlockStatement" && body.body.length >= 1 && body.body[0].type === "IfStatement") {
                    const i = body.body[0];

                    // ... whose consequent is a continue
                    if (i.consequent.type === "ContinueStatement") {
                        return;
                    }

                    // ... whose consequent is a block that contains only a continue
                    if (i.consequent.type === "BlockStatement" && i.consequent.body.length === 1 && i.consequent.body[0].type === "ContinueStatement") {
                        return;
                    }
                }

                context.report({ node, messageId: "wrap" });
            }
        };

    }
};