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/** * @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 //------------------------------------------------------------------------------ /** @type {import('../shared/types').Rule} */ module.exports = { meta: { type: "suggestion", docs: { description: "Disallow `catch` clause parameters from shadowing variables in the outer scope", recommended: false, url: "https://eslint.org/docs/latest/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) { const sourceCode = context.sourceCode; //-------------------------------------------------------------------------- // 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 = sourceCode.getScope(node); /* * 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 } }); } } }; } };