From 52fbd83448f34b580ccadbc5cdd240996264ce38 Mon Sep 17 00:00:00 2001
From: Jake Bailey <5341706+jakebailey@users.noreply.github.com>
Date: Mon, 12 Feb 2024 12:55:17 -0800
Subject: [PATCH] Error if tslint.json is present

---
 .changeset/fifty-points-eat.md | 5 +++++
 packages/dtslint/src/index.ts  | 6 ++++++
 2 files changed, 11 insertions(+)
 create mode 100644 .changeset/fifty-points-eat.md

diff --git a/.changeset/fifty-points-eat.md b/.changeset/fifty-points-eat.md
new file mode 100644
index 0000000000..4f81f74b55
--- /dev/null
+++ b/.changeset/fifty-points-eat.md
@@ -0,0 +1,5 @@
+---
+"@definitelytyped/dtslint": patch
+---
+
+Error if tslint.json is present
diff --git a/packages/dtslint/src/index.ts b/packages/dtslint/src/index.ts
index c528227d35..63e60f696a 100644
--- a/packages/dtslint/src/index.ts
+++ b/packages/dtslint/src/index.ts
@@ -379,5 +379,11 @@ function checkExpectedFiles(dirPath: string, isLatest: boolean): { errors: strin
     errors.push(`${dirPath}: Must contain 'index.d.ts'.`);
   }
 
+  if (fs.existsSync(joinPaths(dirPath, "tslint.json"))) {
+    errors.push(
+      `${dirPath}: Should not contain 'tslint.json'. This file is no longer required; place all lint-related options into .eslintrc.json.`,
+    );
+  }
+
   return { errors };
 }