typescript-eslint · JoshuaKGoldberg · Jun 1, 2024 · Apr 29, 2024 · Apr 29, 2024 · Apr 29, 2024
diff --git a/packages/eslint-plugin/tests/dedupeTestCases.ts b/packages/eslint-plugin/tests/dedupeTestCases.ts
@@ -0,0 +1,14 @@
+export const dedupeTestCases = <T>(...caseArrays: (readonly T[])[]): T[] => {
+  const cases = caseArrays.flat();
+  const dedupedCases = Object.values(
+    Object.fromEntries(
+      cases.map(testCase => [JSON.stringify(testCase), testCase]),
+    ),
+  );
+  if (cases.length === dedupedCases.length) {
+    throw new Error(
+      '`dedupeTestCases` is not necessary — no duplicate test cases detected!',
+    );
+  }
+  return dedupedCases;
+};