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no-catch-shadow.js 2.44 KiB
/**
 * @fileoverview Rule to flag variable leak in CatchClauses in IE 8 and earlier
 * @author Ian Christian Myers
 * @deprecated in ESLint v5.1.0
 */
"use strict";
//------------------------------------------------------------------------------
// Requirements
//------------------------------------------------------------------------------
const astUtils = require("./utils/ast-utils");
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
module.exports = {
    meta: {
        type: "suggestion",
        docs: {
            description: "disallow `catch` clause parameters from shadowing variables in the outer scope",
            category: "Variables",
            recommended: false,
            url: "https://eslint.org/docs/rules/no-catch-shadow"
        replacedBy: ["no-shadow"],
        deprecated: true,
        schema: [],
        messages: {
            mutable: "Value of '{{name}}' may be overwritten in IE 8 and earlier."
    create(context) {
        //--------------------------------------------------------------------------
        // Helpers
        //--------------------------------------------------------------------------
        /**
         * Check if the parameters are been shadowed
         * @param {Object} scope current scope
         * @param {string} name parameter name
         * @returns {boolean} True is its been shadowed
        function paramIsShadowing(scope, name) {
            return astUtils.getVariableByName(scope, name) !== null;
        //--------------------------------------------------------------------------
        // Public API
        //--------------------------------------------------------------------------
        return {
            "CatchClause[param!=null]"(node) {
                let scope = context.getScope();
                 * When ecmaVersion >= 6, CatchClause creates its own scope
                 * so start from one upper scope to exclude the current node
                if (scope.block === node) {
                    scope = scope.upper;
} if (paramIsShadowing(scope, node.param.name)) { context.report({ node, messageId: "mutable", data: { name: node.param.name } }); } } }; } };