Add components

slider/node_modules/eslint/lib/rules/no-undef.js

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+/**
+ * @fileoverview Rule to flag references to undeclared variables.
+ * @author Mark Macdonald
+ */
+"use strict";
+
+//------------------------------------------------------------------------------
+// Helpers
+//------------------------------------------------------------------------------
+
+/**
+ * Checks if the given node is the argument of a typeof operator.
+ * @param {ASTNode} node The AST node being checked.
+ * @returns {boolean} Whether or not the node is the argument of a typeof operator.
+ */
+function hasTypeOfOperator(node) {
+	const parent = node.parent;
+
+	return parent.type === "UnaryExpression" && parent.operator === "typeof";
+}
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+/** @type {import('../types').Rule.RuleModule} */
+module.exports = {
+	meta: {
+		type: "problem",
+
+		defaultOptions: [
+			{
+				typeof: false,
+			},
+		],
+
+		docs: {
+			description:
+				"Disallow the use of undeclared variables unless mentioned in `/*global */` comments",
+			recommended: true,
+			url: "https://eslint.org/docs/latest/rules/no-undef",
+		},
+
+		schema: [
+			{
+				type: "object",
+				properties: {
+					typeof: {
+						type: "boolean",
+					},
+				},
+				additionalProperties: false,
+			},
+		],
+		messages: {
+			undef: "'{{name}}' is not defined.",
+		},
+	},
+
+	create(context) {
+		const [{ typeof: considerTypeOf }] = context.options;
+		const sourceCode = context.sourceCode;
+
+		return {
+			"Program:exit"(node) {
+				const globalScope = sourceCode.getScope(node);
+
+				globalScope.through.forEach(ref => {
+					const identifier = ref.identifier;
+
+					if (!considerTypeOf && hasTypeOfOperator(identifier)) {
+						return;
+					}
+
+					context.report({
+						node: identifier,
+						messageId: "undef",
+						data: identifier,
+					});
+				});
+			},
+		};
+	},
+};