Add components

slider/node_modules/eslint/lib/rules/no-self-compare.js

@@ -0,0 +1,77 @@
+/**
+ * @fileoverview Rule to flag comparison where left part is the same as the right
+ * part.
+ * @author Ilya Volodin
+ */
+
+"use strict";
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+/** @type {import('../types').Rule.RuleModule} */
+module.exports = {
+	meta: {
+		type: "problem",
+
+		docs: {
+			description:
+				"Disallow comparisons where both sides are exactly the same",
+			recommended: false,
+			url: "https://eslint.org/docs/latest/rules/no-self-compare",
+		},
+
+		schema: [],
+
+		messages: {
+			comparingToSelf: "Comparing to itself is potentially pointless.",
+		},
+	},
+
+	create(context) {
+		const sourceCode = context.sourceCode;
+
+		/**
+		 * Determines whether two nodes are composed of the same tokens.
+		 * @param {ASTNode} nodeA The first node
+		 * @param {ASTNode} nodeB The second node
+		 * @returns {boolean} true if the nodes have identical token representations
+		 */
+		function hasSameTokens(nodeA, nodeB) {
+			const tokensA = sourceCode.getTokens(nodeA);
+			const tokensB = sourceCode.getTokens(nodeB);
+
+			return (
+				tokensA.length === tokensB.length &&
+				tokensA.every(
+					(token, index) =>
+						token.type === tokensB[index].type &&
+						token.value === tokensB[index].value,
+				)
+			);
+		}
+
+		return {
+			BinaryExpression(node) {
+				const operators = new Set([
+					"===",
+					"==",
+					"!==",
+					"!=",
+					">",
+					"<",
+					">=",
+					"<=",
+				]);
+
+				if (
+					operators.has(node.operator) &&
+					hasSameTokens(node.left, node.right)
+				) {
+					context.report({ node, messageId: "comparingToSelf" });
+				}
+			},
+		};
+	},
+};