From 3fe0e9c936003aa4b141716bd6c1ff03eff72368 Mon Sep 17 00:00:00 2001
From: Tim <hello@timsmart.co>
Date: Fri, 12 Jul 2024 20:35:17 +1200
Subject: [PATCH] fix process .isTTY detection

---
 .changeset/six-kangaroos-jog.md        |  5 +++++
 packages/effect/src/internal/logger.ts | 11 +++++++++--
 2 files changed, 14 insertions(+), 2 deletions(-)
 create mode 100644 .changeset/six-kangaroos-jog.md

diff --git a/.changeset/six-kangaroos-jog.md b/.changeset/six-kangaroos-jog.md
new file mode 100644
index 0000000000..78d29846d4
--- /dev/null
+++ b/.changeset/six-kangaroos-jog.md
@@ -0,0 +1,5 @@
+---
+"effect": patch
+---
+
+fix process .isTTY detection
diff --git a/packages/effect/src/internal/logger.ts b/packages/effect/src/internal/logger.ts
index 40ccebe0bb..6571e1c603 100644
--- a/packages/effect/src/internal/logger.ts
+++ b/packages/effect/src/internal/logger.ts
@@ -416,9 +416,16 @@ const defaultDateFormat = (date: Date): string =>
     date.getSeconds().toString().padStart(2, "0")
   }.${date.getMilliseconds().toString().padStart(3, "0")}`
 
-const processStdoutIsTTY = typeof process === "object" && "stdout" in process && process.stdout.isTTY === true
+const processStdoutIsTTY = typeof process === "object" &&
+  process !== null &&
+  typeof process.stdout === "object" &&
+  process.stdout !== null &&
+  process.stdout.isTTY === true
 const hasWindow = typeof window === "object"
-const isWorker = typeof self === "object" && self.constructor && self.constructor.name.includes("Worker")
+const isWorker = typeof self === "object" &&
+  self !== null &&
+  typeof self.constructor === "function" &&
+  self.constructor.name.includes("Worker")
 
 /** @internal */
 export const prettyLogger = (options?: {