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+/**
+ * @fileoverview Rule to disallow unmatchable selectors.
+ * @author TKDev7
+ */
+//-----------------------------------------------------------------------------
+// Type Definitions
+//-----------------------------------------------------------------------------
+/**
+ * @import { CSSRuleDefinition } from "../types.js"
+ * @typedef {"unmatchableSelector"} NoUnmatchableSelectorsMessageIds
+ * @typedef {CSSRuleDefinition<{ RuleOptions: [], MessageIds: NoUnmatchableSelectorsMessageIds }>} NoUnmatchableSelectorsRuleDefinition
+ */
+//-----------------------------------------------------------------------------
+// Rule Definition
+//-----------------------------------------------------------------------------
+export default /** @satisfies {NoUnmatchableSelectorsRuleDefinition} */ ({
+    meta: {
+        type: "problem",
+        docs: {
+            description: "Disallow unmatchable selectors",
+            recommended: true,
+            url: "https://github.com/eslint/css/blob/main/docs/rules/no-unmatchable-selectors.md",
+        },
+        messages: {
+            unmatchableSelector: "Unexpected unmatchable selector '{{selector}}'.",
+        },
+    },
+    create(context) {
+        const { sourceCode } = context;
+        return {
+            AnPlusB(node) {
+                // Either node.a or node.b can be null; Number(null) === 0.
+                // This coercion is intentional so that omitted coefficients are treated as 0.
+                const a = Number(node.a);
+                const b = Number(node.b);
+                if (a <= 0 && b <= 0) {
+                    const pseudo = sourceCode.getParent(sourceCode.getParent(node));
+                    context.report({
+                        loc: pseudo.loc,
+                        messageId: "unmatchableSelector",
+                        data: { selector: sourceCode.getText(pseudo) },
+                    });
+                }
+            },
+        };
+    },
+});