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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 | |
| //------------------------------------------------------------------------------ | |
| 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 } }); | |
| } | |
| } | |
| }; | |
| } | |
| }; |