Add components

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

@@ -0,0 +1,101 @@
+/**
+ * @fileoverview Rule to flag when initializing to undefined
+ * @author Ilya Volodin
+ */
+
+"use strict";
+
+//------------------------------------------------------------------------------
+// Requirements
+//------------------------------------------------------------------------------
+
+const astUtils = require("./utils/ast-utils");
+
+//------------------------------------------------------------------------------
+// Helpers
+//------------------------------------------------------------------------------
+
+const CONSTANT_BINDINGS = new Set(["const", "using", "await using"]);
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+/** @type {import('../types').Rule.RuleModule} */
+module.exports = {
+	meta: {
+		type: "suggestion",
+
+		docs: {
+			description: "Disallow initializing variables to `undefined`",
+			recommended: false,
+			frozen: true,
+			url: "https://eslint.org/docs/latest/rules/no-undef-init",
+		},
+
+		schema: [],
+		fixable: "code",
+
+		messages: {
+			unnecessaryUndefinedInit:
+				"It's not necessary to initialize '{{name}}' to undefined.",
+		},
+	},
+
+	create(context) {
+		const sourceCode = context.sourceCode;
+
+		return {
+			VariableDeclarator(node) {
+				const name = sourceCode.getText(node.id),
+					init = node.init && node.init.name,
+					scope = sourceCode.getScope(node),
+					undefinedVar = astUtils.getVariableByName(
+						scope,
+						"undefined",
+					),
+					shadowed = undefinedVar && undefinedVar.defs.length > 0,
+					lastToken = sourceCode.getLastToken(node);
+
+				if (
+					init === "undefined" &&
+					!CONSTANT_BINDINGS.has(node.parent.kind) &&
+					!shadowed
+				) {
+					context.report({
+						node,
+						messageId: "unnecessaryUndefinedInit",
+						data: { name },
+						fix(fixer) {
+							if (node.parent.kind === "var") {
+								return null;
+							}
+
+							if (
+								node.id.type === "ArrayPattern" ||
+								node.id.type === "ObjectPattern"
+							) {
+								// Don't fix destructuring assignment to `undefined`.
+								return null;
+							}
+
+							if (
+								sourceCode.commentsExistBetween(
+									node.id,
+									lastToken,
+								)
+							) {
+								return null;
+							}
+
+							return fixer.removeRange([
+								node.id.range[1],
+								node.range[1],
+							]);
+						},
+					});
+				}
+			},
+		};
+	},
+};