fix: Fix build on react@next

package.json

@@ -50,6 +50,7 @@
     "@reach/router": "^1.3.3",
     "@testing-library/jest-dom": "^5.10.1",
     "@types/react-dom": "^16.9.8",
+    "@types/scheduler": "^0.16.1",
     "dotenv-cli": "^3.1.0",
     "dtslint": "3.6.12",
     "kcd-scripts": "^6.2.3",
@@ -61,7 +62,8 @@
   },
   "peerDependencies": {
     "react": "*",
-    "react-dom": "*"
+    "react-dom": "*",
+    "scheduler": "*"
   },
   "eslintConfig": {
     "extends": "./node_modules/kcd-scripts/eslint.js",

src/flush-microtasks.js

@@ -1,3 +1,7 @@
+import {
+  unstable_scheduleCallback as scheduleCallback,
+  unstable_NormalPriority as normalPriority,
+} from 'scheduler'
 /* istanbul ignore file */
 // the part of this file that we need tested is definitely being run
 // and the part that is not cannot easily have useful tests written
@@ -59,7 +63,11 @@ export default function flushMicroTasks() {
         jest.advanceTimersByTime(0)
         resolve()
       } else {
-        enqueueTask(resolve)
+        scheduleCallback(normalPriority, () => {
+          enqueueTask(() => {
+            resolve()
+          })
+        })
       }
     },
   }