first commit

2026-08-06 12:00:39 +10:00
commit 91221f5a8e
3259 changed files with 569069 additions and 0 deletions
@@ -0,0 +1,70 @@
+/**
+ * @fileoverview Rule to disallow duplicate selectors within keyframe blocks.
+ * @author Nitin Kumar
+ */
+//-----------------------------------------------------------------------------
+// Type Definitions
+//-----------------------------------------------------------------------------
+/**
+ * @import { CSSRuleDefinition } from "../types.js"
+ * @typedef {"duplicateKeyframeSelector"} DuplicateKeyframeSelectorMessageIds
+ * @typedef {CSSRuleDefinition<{ RuleOptions: [], MessageIds: DuplicateKeyframeSelectorMessageIds }>} DuplicateKeyframeSelectorRuleDefinition
+ */
+//-----------------------------------------------------------------------------
+// Rule Definition
+//-----------------------------------------------------------------------------
+export default /** @satisfies {DuplicateKeyframeSelectorRuleDefinition} */ ({
+    meta: {
+        type: "problem",
+        docs: {
+            description: "Disallow duplicate selectors within keyframe blocks",
+            recommended: true,
+            url: "https://github.com/eslint/css/blob/main/docs/rules/no-duplicate-keyframe-selectors.md",
+        },
+        messages: {
+            duplicateKeyframeSelector: "Unexpected duplicate selector '{{selector}}' found within keyframe block.",
+        },
+    },
+    create(context) {
+        let insideKeyframes = false;
+        const seen = new Map();
+        return {
+            "Atrule[name=/^(-(o|moz|webkit)-)?keyframes$/i]"() {
+                insideKeyframes = true;
+                seen.clear();
+            },
+            "Atrule[name=/^(-(o|moz|webkit)-)?keyframes$/i]:exit"() {
+                insideKeyframes = false;
+            },
+            Rule(node) {
+                if (!insideKeyframes) {
+                    return;
+                }
+                // @ts-ignore - children is a valid property for prelude
+                const selector = node.prelude.children[0].children[0];
+                let value;
+                if (selector.type === "Percentage") {
+                    value = `${selector.value}%`;
+                }
+                else if (selector.type === "TypeSelector") {
+                    value = selector.name.toLowerCase();
+                }
+                else {
+                    value = selector.value;
+                }
+                if (seen.has(value)) {
+                    context.report({
+                        loc: selector.loc,
+                        messageId: "duplicateKeyframeSelector",
+                        data: {
+                            selector: value,
+                        },
+                    });
+                }
+                else {
+                    seen.set(value, true);
+                }
+            },
+        };
+    },
+});