From 0c0058f1181d1fd6590f760a0375ead706043d32 Mon Sep 17 00:00:00 2001
From: Ryan Dahl <ry@tinyclouds.org>
Date: Tue, 15 Jun 2021 14:18:16 -0400
Subject: fix: set minimum timeout to be 4 milliseconds (#10972)

---
 extensions/timers/lib.rs | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/extensions/timers/lib.rs b/extensions/timers/lib.rs
index 43a40e939..5f65ae3ef 100644
--- a/extensions/timers/lib.rs
+++ b/extensions/timers/lib.rs
@@ -122,6 +122,12 @@ pub fn op_global_timer_start(
   timeout: u64,
   _: (),
 ) -> Result<(), AnyError> {
+  // According to spec, minimum allowed timeout is 4 ms.
+  // https://html.spec.whatwg.org/multipage/timers-and-user-prompts.html#timers
+  // TODO(#10974) Per spec this is actually a little more complicated than this.
+  // The minimum timeout depends on the nesting level of the timeout.
+  let timeout = std::cmp::max(timeout, 4);
+
   let deadline = Instant::now() + Duration::from_millis(timeout);
   let global_timer = state.borrow_mut::<GlobalTimer>();
   global_timer.new_timeout(deadline);
-- 
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