Umama-at-Bluchip/Quick-UI

1/**2 * @fileoverview Rule to flag variable leak in CatchClauses in IE 8 and earlier3 * @author Ian Christian Myers4 * @deprecated in ESLint v5.1.05 */6 7"use strict";8 9//------------------------------------------------------------------------------10// Requirements11//------------------------------------------------------------------------------12 13const astUtils = require("./utils/ast-utils");14 15//------------------------------------------------------------------------------16// Rule Definition17//------------------------------------------------------------------------------18 19/** @type {import('../shared/types').Rule} */20module.exports = {21    meta: {22        type: "suggestion",23 24        docs: {25            description: "Disallow `catch` clause parameters from shadowing variables in the outer scope",26            recommended: false,27            url: "https://eslint.org/docs/latest/rules/no-catch-shadow"28        },29 30        replacedBy: ["no-shadow"],31 32        deprecated: true,33        schema: [],34 35        messages: {36            mutable: "Value of '{{name}}' may be overwritten in IE 8 and earlier."37        }38    },39 40    create(context) {41 42        const sourceCode = context.sourceCode;43 44        //--------------------------------------------------------------------------45        // Helpers46        //--------------------------------------------------------------------------47 48        /**49         * Check if the parameters are been shadowed50         * @param {Object} scope current scope51         * @param {string} name parameter name52         * @returns {boolean} True is its been shadowed53         */54        function paramIsShadowing(scope, name) {55            return astUtils.getVariableByName(scope, name) !== null;56        }57 58        //--------------------------------------------------------------------------59        // Public API60        //--------------------------------------------------------------------------61 62        return {63 64            "CatchClause[param!=null]"(node) {65                let scope = sourceCode.getScope(node);66 67                /*68                 * When ecmaVersion >= 6, CatchClause creates its own scope69                 * so start from one upper scope to exclude the current node70                 */71                if (scope.block === node) {72                    scope = scope.upper;73                }74 75                if (paramIsShadowing(scope, node.param.name)) {76                    context.report({ node, messageId: "mutable", data: { name: node.param.name } });77                }78            }79        };80 81    }82};83