From 181b2ee4313cef4f0775a2926ff47c70af123e72 Mon Sep 17 00:00:00 2001
From: Matan Borenkraout <matanbobi@gmail.com>
Date: Wed, 8 Jul 2020 21:14:19 +0300
Subject: [PATCH 1/3] fix(flushMicroTasks): Fallback to no scheduler in case of
 exception

Closes #736
---
 src/flush-microtasks.js | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/src/flush-microtasks.js b/src/flush-microtasks.js
index 99b56ea5..b4fd4848 100644
--- a/src/flush-microtasks.js
+++ b/src/flush-microtasks.js
@@ -20,7 +20,7 @@ function getIsUsingFakeTimers() {
 
 const globalObj = typeof window === 'undefined' ? global : window
 let Scheduler = globalObj.Scheduler
-const isModernScheduleCallbackSupported = satisfies(React.version, '>16.8.6', {
+let isModernScheduleCallbackSupported = satisfies(React.version, '>16.8.6', {
   includePrerelease: true,
 })
 
@@ -58,6 +58,17 @@ try {
           'if you encounter this warning.',
       )
     }
+
+    if (isModernScheduleCallbackSupported) {
+      // eslint-disable-next-line no-console
+      console.error(
+        'This environment does not support module requiring, so we cannot require the Scheduler. ' +
+          'To fix this you can require the Scheduler in your test setup file.',
+      )
+
+      // Fallback to no scheduleCallback Supported.
+      isModernScheduleCallbackSupported = false
+    }
   }
 }
 

From aa355092573b3d5c20306dbf53dc13831239f80f Mon Sep 17 00:00:00 2001
From: "Kent C. Dodds" <me+github@kentcdodds.com>
Date: Wed, 8 Jul 2020 12:36:32 -0600
Subject: [PATCH 2/3] Update src/flush-microtasks.js

---
 src/flush-microtasks.js | 14 ++++----------
 1 file changed, 4 insertions(+), 10 deletions(-)

diff --git a/src/flush-microtasks.js b/src/flush-microtasks.js
index 711f6b70..db7f338d 100644
--- a/src/flush-microtasks.js
+++ b/src/flush-microtasks.js
@@ -59,19 +59,13 @@ try {
       )
     }
 
-    if (isModernScheduleCallbackSupported) {
-      // eslint-disable-next-line no-console
-      console.error(
-        'This environment does not support module requiring, so we cannot require the Scheduler. ' +
-          'To fix this you can require the Scheduler in your test setup file.',
-      )
-
-      // Fallback to no scheduleCallback Supported.
-      isModernScheduleCallbackSupported = false
-    }
   }
 }
 
+const isModernScheduleCallbackSupported = Scheduler && satisfies(React.version, '>16.8.6', {
+  includePrerelease: true,
+})
+
 function scheduleCallback(cb) {
   const NormalPriority = Scheduler
     ? Scheduler.NormalPriority || Scheduler.unstable_NormalPriority

From 1df3089f4597822504c6e7efe3fc5eca82dde758 Mon Sep 17 00:00:00 2001
From: "Kent C. Dodds" <me+github@kentcdodds.com>
Date: Wed, 8 Jul 2020 12:36:38 -0600
Subject: [PATCH 3/3] Update src/flush-microtasks.js

---
 src/flush-microtasks.js | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/src/flush-microtasks.js b/src/flush-microtasks.js
index db7f338d..3789bf80 100644
--- a/src/flush-microtasks.js
+++ b/src/flush-microtasks.js
@@ -20,9 +20,6 @@ function getIsUsingFakeTimers() {
 
 const globalObj = typeof window === 'undefined' ? global : window
 let Scheduler = globalObj.Scheduler
-let isModernScheduleCallbackSupported = satisfies(React.version, '>16.8.6', {
-  includePrerelease: true,
-})
 
 let didWarnAboutMessageChannel = false
 let enqueueTask