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Viewing file:     no-new-func.js (2.91 KB)      -rw-r--r--

/**
 * @fileoverview Rule to flag when using new Function
 * @author Ilya Volodin
 */

"use strict";

//------------------------------------------------------------------------------
// Requirements
//------------------------------------------------------------------------------

const astUtils = require("./utils/ast-utils");

//------------------------------------------------------------------------------
// Helpers
//------------------------------------------------------------------------------

const callMethods = new Set(["apply", "bind", "call"]);

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

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

        docs: {
            description: "Disallow `new` operators with the `Function` object",
            recommended: false,
            url: "https://eslint.org/docs/rules/no-new-func"
        },

        schema: [],

        messages: {
            noFunctionConstructor: "The Function constructor is eval."
        }
    },

    create(context) {

        return {
            "Program:exit"() {
                const globalScope = context.getScope();
                const variable = globalScope.set.get("Function");

                if (variable && variable.defs.length === 0) {
                    variable.references.forEach(ref => {
                        const node = ref.identifier;
                        const { parent } = node;
                        let evalNode;

                        if (parent) {
                            if (node === parent.callee && (
                                parent.type === "NewExpression" ||
                                parent.type === "CallExpression"
                            )) {
                                evalNode = parent;
                            } else if (
                                parent.type === "MemberExpression" &&
                                node === parent.object &&
                                callMethods.has(astUtils.getStaticPropertyName(parent))
                            ) {
                                const maybeCallee = parent.parent.type === "ChainExpression" ? parent.parent : parent;

                                if (maybeCallee.parent.type === "CallExpression" && maybeCallee.parent.callee === maybeCallee) {
                                    evalNode = maybeCallee.parent;
                                }
                            }
                        }

                        if (evalNode) {
                            context.report({
                                node: evalNode,
                                messageId: "noFunctionConstructor"
                            });
                        }
                    });
                }
            }
        };

    }
};