From 95d97c81cd0d8d9bf15462fcbad48c5a1062ae43 Mon Sep 17 00:00:00 2001
From: Alex <sheppenguin@gmail.com>
Date: Wed, 3 Jun 2026 11:35:02 -0400
Subject: [PATCH] Limit duplicate utility candidates to utilities

---
 src/analyzers/duplicateUtilityDrift.ts | 7 ++++---
 tests/duplicateUtilityDrift.test.ts    | 9 +++++++++
 2 files changed, 13 insertions(+), 3 deletions(-)

diff --git a/src/analyzers/duplicateUtilityDrift.ts b/src/analyzers/duplicateUtilityDrift.ts
index 89698d3..bb89262 100644
--- a/src/analyzers/duplicateUtilityDrift.ts
+++ b/src/analyzers/duplicateUtilityDrift.ts
@@ -14,14 +14,15 @@ export function analyzeDuplicateUtilityDrift(
   }
 
   const changedPaths = new Set(changedFiles.map((file) => file.path));
-  const sourceFilePaths = new Set(
+  const utilityFilePaths = new Set(
     allFiles
-      .filter((file) => classifyFileCategory(file) !== "test")
+      .filter((file) => classifyFileCategory(file) === "utility")
       .map((file) => file.path)
   );
   const baselineFunctions = profile.exportedFunctions.filter(
     (exportedFunction) =>
-      sourceFilePaths.has(exportedFunction.filePath) && !changedPaths.has(exportedFunction.filePath)
+      utilityFilePaths.has(exportedFunction.filePath) &&
+      !changedPaths.has(exportedFunction.filePath)
   );
   const findings: DriftFinding[] = [];
 
diff --git a/tests/duplicateUtilityDrift.test.ts b/tests/duplicateUtilityDrift.test.ts
index 8244d2d..4b7a69a 100644
--- a/tests/duplicateUtilityDrift.test.ts
+++ b/tests/duplicateUtilityDrift.test.ts
@@ -79,4 +79,13 @@ describe("analyzeDuplicateUtilityDrift", () => {
 
     expect(findings).toEqual([]);
   });
+
+  it("does not use non-utility exports as duplicate candidates", () => {
+    const findings = analyze([
+      file("src/utils/dateFormat.ts", "export function formatDate() {}", true),
+      file("src/components/FormatDateShort.tsx", "export function formatDateShort() {}")
+    ]);
+
+    expect(findings).toEqual([]);
+  });
 });