v1.0 with SW PWA enabled

frontend/node_modules/eslint/lib/rules/no-ex-assign.js

@@ -0,0 +1,57 @@
+/**
+ * @fileoverview Rule to flag assignment of the exception parameter
+ * @author Stephen Murray <spmurrayzzz>
+ */
+
+"use strict";
+
+const astUtils = require("./utils/ast-utils");
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+/** @type {import('../types').Rule.RuleModule} */
+module.exports = {
+	meta: {
+		type: "problem",
+
+		docs: {
+			description: "Disallow reassigning exceptions in `catch` clauses",
+			recommended: true,
+			url: "https://eslint.org/docs/latest/rules/no-ex-assign",
+		},
+
+		schema: [],
+
+		messages: {
+			unexpected: "Do not assign to the exception parameter.",
+		},
+	},
+
+	create(context) {
+		const sourceCode = context.sourceCode;
+
+		/**
+		 * Finds and reports references that are non initializer and writable.
+		 * @param {Variable} variable A variable to check.
+		 * @returns {void}
+		 */
+		function checkVariable(variable) {
+			astUtils
+				.getModifyingReferences(variable.references)
+				.forEach(reference => {
+					context.report({
+						node: reference.identifier,
+						messageId: "unexpected",
+					});
+				});
+		}
+
+		return {
+			CatchClause(node) {
+				sourceCode.getDeclaredVariables(node).forEach(checkVariable);
+			},
+		};
+	},
+};