thingies

parts/3/phonebookBackend/node_modules/eslint/lib/rules/no-const-assign.js

@@ -0,0 +1,62 @@
+/**
+ * @fileoverview A rule to disallow modifying variables that are declared using `const`
+ * @author Toru Nagashima
+ */
+
+"use strict";
+
+const astUtils = require("./utils/ast-utils");
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+/** @type {import('../types').Rule.RuleModule} */
+module.exports = {
+	meta: {
+		type: "problem",
+
+		docs: {
+			description: "Disallow reassigning `const` variables",
+			recommended: true,
+			url: "https://eslint.org/docs/latest/rules/no-const-assign",
+		},
+
+		schema: [],
+
+		messages: {
+			const: "'{{name}}' is constant.",
+		},
+	},
+
+	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: "const",
+						data: { name: reference.identifier.name },
+					});
+				});
+		}
+
+		return {
+			VariableDeclaration(node) {
+				if (node.kind === "const") {
+					sourceCode
+						.getDeclaredVariables(node)
+						.forEach(checkVariable);
+				}
+			},
+		};
+	},
+};