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slider/node_modules/eslint/lib/rules/no-shadow-restricted-names.js

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+/**
+ * @fileoverview Disallow shadowing of globalThis, NaN, undefined, and Infinity (ES2020 section 18.1)
+ * @author Michael Ficarra
+ */
+"use strict";
+
+/**
+ * Determines if a variable safely shadows undefined.
+ * This is the case when a variable named `undefined` is never assigned to a value (i.e. it always shares the same value
+ * as the global).
+ * @param {eslintScope.Variable} variable The variable to check
+ * @returns {boolean} true if this variable safely shadows `undefined`
+ */
+function safelyShadowsUndefined(variable) {
+	return (
+		variable.name === "undefined" &&
+		variable.references.every(ref => !ref.isWrite()) &&
+		variable.defs.every(
+			def =>
+				def.node.type === "VariableDeclarator" &&
+				def.node.init === null,
+		)
+	);
+}
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+/** @type {import('../types').Rule.RuleModule} */
+module.exports = {
+	meta: {
+		type: "suggestion",
+
+		defaultOptions: [
+			{
+				reportGlobalThis: false,
+			},
+		],
+
+		docs: {
+			description: "Disallow identifiers from shadowing restricted names",
+			recommended: true,
+			url: "https://eslint.org/docs/latest/rules/no-shadow-restricted-names",
+		},
+
+		schema: [
+			{
+				type: "object",
+				properties: {
+					reportGlobalThis: {
+						type: "boolean",
+					},
+				},
+				additionalProperties: false,
+			},
+		],
+
+		messages: {
+			shadowingRestrictedName: "Shadowing of global property '{{name}}'.",
+		},
+	},
+
+	create(context) {
+		const [{ reportGlobalThis }] = context.options;
+
+		const RESTRICTED = new Set([
+			"undefined",
+			"NaN",
+			"Infinity",
+			"arguments",
+			"eval",
+		]);
+
+		if (reportGlobalThis) {
+			RESTRICTED.add("globalThis");
+		}
+
+		const sourceCode = context.sourceCode;
+
+		// Track reported nodes to avoid duplicate reports. For example, on class declarations.
+		const reportedNodes = new Set();
+
+		return {
+			"VariableDeclaration, :function, CatchClause, ImportDeclaration, ClassDeclaration, ClassExpression"(
+				node,
+			) {
+				for (const variable of sourceCode.getDeclaredVariables(node)) {
+					if (
+						variable.defs.length > 0 &&
+						RESTRICTED.has(variable.name) &&
+						!safelyShadowsUndefined(variable)
+					) {
+						for (const def of variable.defs) {
+							const nodeToReport = def.name;
+
+							if (!reportedNodes.has(nodeToReport)) {
+								reportedNodes.add(nodeToReport);
+								context.report({
+									node: nodeToReport,
+									messageId: "shadowingRestrictedName",
+									data: {
+										name: variable.name,
+									},
+								});
+							}
+						}
+					}
+				}
+			},
+		};
+	},
+};