fix: do not use performance.now if it's not available (#5897)

fubhy · web-flow · commit a6dfca93b676 · 2025-12-13T16:14:00.000+13:00
diff --git a/.changeset/fancy-vans-shave.md b/.changeset/fancy-vans-shave.md
@@ -0,0 +1,5 @@
+---
+"effect": patch
+---
+
+Ensure `performance.now` is only used if it's available
diff --git a/packages/effect/src/internal/clock.ts b/packages/effect/src/internal/clock.ts
@@ -40,7 +40,7 @@ export const globalClockScheduler: Clock.ClockScheduler = {
 
 const performanceNowNanos = (function() {
   const bigint1e6 = BigInt(1_000_000)
-  if (typeof performance === "undefined") {
+  if (typeof performance === "undefined" || typeof performance.now !== "function") {
     return () => BigInt(Date.now()) * bigint1e6
   }
   let origin: bigint

-Original file line number
+Diff line change
@@ @@ -0,0 +1,5 @@ @@
 +---
 +"effect": patch
 +---
++
 +Ensure `performance.now` is only used if it's available
Original file line number	Diff line number	Diff line change
`@@ -40,7 +40,7 @@ export const globalClockScheduler: Clock.ClockScheduler = {`
`40`	`40`
`41`	`41`	`const performanceNowNanos = (function() {`
`42`	`42`	`const bigint1e6 = BigInt(1_000_000)`
`43`		`- if (typeof performance === "undefined") {`
	`43`	`+ if (typeof performance === "undefined" \|\| typeof performance.now !== "function") {`
`44`	`44`	`return () => BigInt(Date.now()) * bigint1e6`
`45`	`45`	`}`
`46`	`46`	`let origin: bigint`