fix(flushMicroTasks): fallback to no scheduler (#739)

MatanBobi · kentcdodds · web-flow · commit 9e5cf59ceaa6 · 2020-07-08T12:46:21.000-06:00
Co-authored-by: Kent C. Dodds &lt;me+github@kentcdodds.com&gt;
diff --git 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
-const isModernScheduleCallbackSupported = satisfies(React.version, '>16.8.6', {
-  includePrerelease: true,
-})
 
 let didWarnAboutMessageChannel = false
 let enqueueTask
@@ -58,9 +55,14 @@ try {
           'if you encounter this warning.',
       )
     }
+
   }
 }
 
+const isModernScheduleCallbackSupported = Scheduler && satisfies(React.version, '>16.8.6', {
+  includePrerelease: true,
+})
+
 function scheduleCallback(cb) {
   const NormalPriority = Scheduler
     ? Scheduler.NormalPriority || Scheduler.unstable_NormalPriority

Original file line number	Diff line number	Diff line change
`@@ -20,9 +20,6 @@ function getIsUsingFakeTimers() {`
`20`	`20`
`21`	`21`	`const globalObj = typeof window === 'undefined' ? global : window`
`22`	`22`	`let Scheduler = globalObj.Scheduler`
`23`		`-const isModernScheduleCallbackSupported = satisfies(React.version, '>16.8.6', {`
`24`		`- includePrerelease: true,`
`25`		`-})`
`26`	`23`
`27`	`24`	`let didWarnAboutMessageChannel = false`
`28`	`25`	`let enqueueTask`
`@@ -58,9 +55,14 @@ try {`
`58`	`55`	`'if you encounter this warning.',`
`59`	`56`	`)`
`60`	`57`	`}`
	`58`	`+`
`61`	`59`	`}`
`62`	`60`	`}`
`63`	`61`
	`62`	`+const isModernScheduleCallbackSupported = Scheduler && satisfies(React.version, '>16.8.6', {`
	`63`	`+ includePrerelease: true,`
	`64`	`+})`
	`65`	`+`
`64`	`66`	`function scheduleCallback(cb) {`
`65`	`67`	`const NormalPriority = Scheduler`
`66`	`68`	`? Scheduler.NormalPriority \|\| Scheduler.unstable_NormalPriority`