fix(batch): refactor queue to avoid import cycle

src/queue.js

@@ -1,12 +1,11 @@
-import { isInsideBatch } from './scheduler'
-
 class Queue {
   constructor () {
     this.taskSet = new Set()
+    this.isInsideBatch = false
   }
 
   add = task => {
-    if (isInsideBatch) {
+    if (this.isInsideBatch) {
       this.taskSet.add(task)
     } else {
       task()
@@ -19,6 +18,14 @@ class Queue {
       this.taskSet.clear()
     }
   };
+
+  on = () => {
+    this.isInsideBatch = true
+  };
+
+  off = () => {
+    this.isInsideBatch = false
+  };
 }
 
 export const queue = new Queue()

src/scheduler.js

@@ -5,18 +5,17 @@ import { queue } from './queue'
 
 // this runs the passed function and delays all re-renders
 // until the function is finished running
-export let isInsideBatch = false
 export function batch (fn, ctx, args) {
   let result
-  if (isInsideBatch) {
+  if (queue.isInsideBatch) {
     result = fn.apply(ctx, args)
   } else {
     try {
-      isInsideBatch = true
+      queue.on()
       result = fn.apply(ctx, args)
     } finally {
       queue.flush()
-      isInsideBatch = false
+      queue.off()
     }
   }
   return result