Add Bailout effectTag for React DevTools

src/renderers/shared/fiber/ReactFiberBeginWork.js

@@ -50,7 +50,13 @@ var {
   Fragment,
 } = ReactTypeOfWork;
 var {NoWork, OffscreenPriority} = require('ReactPriorityLevel');
-var {Placement, ContentReset, Err, Ref} = require('ReactTypeOfSideEffect');
+var {
+  PerformedWork,
+  Placement,
+  ContentReset,
+  Err,
+  Ref,
+} = require('ReactTypeOfSideEffect');
 var ReactFiberClassComponent = require('ReactFiberClassComponent');
 var {ReactCurrentOwner} = require('ReactGlobalSharedState');
 var invariant = require('fbjs/lib/invariant');
@@ -249,6 +255,8 @@ module.exports = function<T, P, I, TI, PI, C, CX, PL>(
     } else {
       nextChildren = fn(nextProps, context);
     }
+    // React DevTools reads this flag.
+    workInProgress.effectTag |= PerformedWork;
     reconcileChildren(current, workInProgress, nextChildren);
     memoizeProps(workInProgress, nextProps);
     return workInProgress.child;
@@ -315,6 +323,8 @@ module.exports = function<T, P, I, TI, PI, C, CX, PL>(
     } else {
       nextChildren = instance.render();
     }
+    // React DevTools reads this flag.
+    workInProgress.effectTag |= PerformedWork;
     reconcileChildren(current, workInProgress, nextChildren);
     // Memoize props and state using the values we just used to render.
     // TODO: Restructure so we never read values from the instance.
@@ -548,6 +558,8 @@ module.exports = function<T, P, I, TI, PI, C, CX, PL>(
     } else {
       value = fn(props, context);
     }
+    // React DevTools reads this flag.
+    workInProgress.effectTag |= PerformedWork;
 
     if (
       typeof value === 'object' &&

src/renderers/shared/fiber/ReactFiberScheduler.js

@@ -64,7 +64,7 @@ var {
 var {AsyncUpdates} = require('ReactTypeOfInternalContext');
 
 var {
-  NoEffect,
+  PerformedWork,
   Placement,
   Update,
   PlacementAndUpdate,
@@ -335,7 +335,8 @@ module.exports = function<T, P, I, TI, PI, C, CX, PL>(
       // updates, and deletions. To avoid needing to add a case for every
       // possible bitmap value, we remove the secondary effects from the
       // effect tag and switch on that value.
-      let primaryEffectTag = effectTag & ~(Callback | Err | ContentReset | Ref);
+      let primaryEffectTag =
+        effectTag & ~(Callback | Err | ContentReset | Ref | PerformedWork);
       switch (primaryEffectTag) {
         case Placement: {
           commitPlacement(nextEffect);
@@ -445,7 +446,7 @@ module.exports = function<T, P, I, TI, PI, C, CX, PL>(
     priorityContext = TaskPriority;
 
     let firstEffect;
-    if (finishedWork.effectTag !== NoEffect) {
+    if (finishedWork.effectTag > PerformedWork) {
       // A fiber's effect list consists only of its children, not itself. So if
       // the root has an effect, we need to add it to the end of the list. The
       // resulting list is the set that would belong to the root's parent, if
@@ -641,7 +642,10 @@ module.exports = function<T, P, I, TI, PI, C, CX, PL>(
         // to schedule our own side-effect on our own list because if end up
         // reusing children we'll schedule this effect onto itself since we're
         // at the end.
-        if (workInProgress.effectTag !== NoEffect) {
+        const effectTag = workInProgress.effectTag;
+        // Skip both NoWork and PerformedWork tags when creating the effect list.
+        // PerformedWork effect is read by React DevTools but shouldn't be committed.
+        if (effectTag > PerformedWork) {
           if (returnFiber.lastEffect !== null) {
             returnFiber.lastEffect.nextEffect = workInProgress;
           } else {

src/renderers/shared/fiber/ReactTypeOfSideEffect.js

@@ -15,13 +15,16 @@
 export type TypeOfSideEffect = number;
 
 module.exports = {
-  NoEffect: 0, //           0b0000000
-  Placement: 1, //          0b0000001
-  Update: 2, //             0b0000010
-  PlacementAndUpdate: 3, // 0b0000011
-  Deletion: 4, //           0b0000100
-  ContentReset: 8, //       0b0001000
-  Callback: 16, //          0b0010000
-  Err: 32, //               0b0100000
-  Ref: 64, //               0b1000000
+  // Don't change these two values:
+  NoEffect: 0, //           0b00000000
+  PerformedWork: 1, //      0b00000001
+  // You can change the rest (and add more).
+  Placement: 2, //          0b00000010
+  Update: 4, //             0b00000100
+  PlacementAndUpdate: 6, // 0b00000110
+  Deletion: 8, //           0b00001000
+  ContentReset: 16, //      0b00010000
+  Callback: 32, //          0b00100000
+  Err: 64, //               0b01000000
+  Ref: 128, //              0b10000000
 };