Add components

slider/node_modules/eslint/lib/rules/no-unassigned-vars.js

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+/**
+ * @fileoverview Rule to flag variables that are never assigned
+ * @author Jacob Bandes-Storch <https://github.com/jtbandes>
+ */
+"use strict";
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+/** @type {import('../types').Rule.RuleModule} */
+module.exports = {
+	meta: {
+		type: "problem",
+		dialects: ["typescript", "javascript"],
+		language: "javascript",
+
+		docs: {
+			description:
+				"Disallow `let` or `var` variables that are read but never assigned",
+			recommended: false,
+			url: "https://eslint.org/docs/latest/rules/no-unassigned-vars",
+		},
+
+		schema: [],
+		messages: {
+			unassigned:
+				"'{{name}}' is always 'undefined' because it's never assigned.",
+		},
+	},
+
+	create(context) {
+		const sourceCode = context.sourceCode;
+		let insideDeclareModule = false;
+
+		return {
+			"TSModuleDeclaration[declare=true]"() {
+				insideDeclareModule = true;
+			},
+			"TSModuleDeclaration[declare=true]:exit"() {
+				insideDeclareModule = false;
+			},
+			VariableDeclarator(node) {
+				/** @type {import('estree').VariableDeclaration} */
+				const declaration = node.parent;
+				const shouldSkip =
+					node.init ||
+					node.id.type !== "Identifier" ||
+					declaration.kind === "const" ||
+					declaration.declare ||
+					insideDeclareModule;
+				if (shouldSkip) {
+					return;
+				}
+				const [variable] = sourceCode.getDeclaredVariables(node);
+				if (!variable) {
+					return;
+				}
+				let hasRead = false;
+				for (const reference of variable.references) {
+					if (reference.isWrite()) {
+						return;
+					}
+					if (reference.isRead()) {
+						hasRead = true;
+					}
+				}
+				if (!hasRead) {
+					// Variables that are never read should be flagged by no-unused-vars instead
+					return;
+				}
+				context.report({
+					node,
+					messageId: "unassigned",
+					data: { name: node.id.name },
+				});
+			},
+		};
+	},
+};