Add components

slider/node_modules/eslint/lib/rules/no-catch-shadow.js

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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('../types').Rule.RuleModule} */
+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",
+		},
+
+		deprecated: {
+			message: "This rule was renamed.",
+			url: "https://eslint.org/blog/2018/07/eslint-v5.1.0-released/",
+			deprecatedSince: "5.1.0",
+			availableUntil: null,
+			replacedBy: [
+				{
+					rule: {
+						name: "no-shadow",
+						url: "https://eslint.org/docs/rules/no-shadow",
+					},
+				},
+			],
+		},
+		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 },
+					});
+				}
+			},
+		};
+	},
+};