[WIP] Decouple update queue from Fiber type

The update queue is in need of a refactor. Recent bugfixes (facebook#12528) have
exposed some flaws in how it's modeled. Upcoming features like Suspense
and [redacted] also rely on the update queue in ways that weren't
anticipated in the original design.

Major changes:

- Instead of boolean flags for `isReplace` and `isForceUpdate`, updates
have a `tag` field (like Fiber). This lowers the cost for adding new
types of updates.
- Render phase updates are special cased. Updates scheduled during
the render phase are dropped if the work-in-progress does not commit.
This is used for `getDerivedStateFrom{Props,Catch}`.
- `callbackList` has been replaced with a generic effect list. Aside
from callbacks, this is also used for `componentDidCatch`.

TODO:

- [x] Class components
- [ ] Host roots
- [ ] Fix Flow

packages/react-reconciler/src/ReactFiberBeginWork.js

@@ -35,10 +35,12 @@ import {
   ContextConsumer,
 } from 'shared/ReactTypeOfWork';
 import {
+  NoEffect,
   PerformedWork,
   Placement,
   ContentReset,
   Ref,
+  DidCapture,
 } from 'shared/ReactTypeOfSideEffect';
 import {ReactCurrentOwner} from 'shared/ReactGlobalSharedState';
 import {
@@ -58,7 +60,12 @@ import {
   reconcileChildFibers,
   cloneChildFibers,
 } from './ReactChildFiber';
-import {processUpdateQueue} from './ReactFiberUpdateQueue';
+import {processUpdateQueue as processLegacyUpdateQueue} from './ReactFiberUpdateQueue';
+import {
+  createDeriveStateFromPropsUpdate,
+  enqueueRenderPhaseUpdate,
+  processUpdateQueue,
+} from './ReactUpdateQueue';
 import {NoWork, Never} from './ReactFiberExpirationTime';
 import {AsyncMode, StrictMode} from './ReactTypeOfMode';
 import MAX_SIGNED_31_BIT_INT from './maxSigned31BitInt';
@@ -260,7 +267,11 @@ export default function<T, P, I, TI, HI, PI, C, CC, CX, PL>(
     if (current === null) {
       if (workInProgress.stateNode === null) {
         // In the initial pass we might need to construct the instance.
-        constructClassInstance(workInProgress, workInProgress.pendingProps);
+        constructClassInstance(
+          workInProgress,
+          workInProgress.pendingProps,
+          renderExpirationTime,
+        );
         mountClassInstance(workInProgress, renderExpirationTime);
 
         shouldUpdate = true;
@@ -278,22 +289,11 @@ export default function<T, P, I, TI, HI, PI, C, CC, CX, PL>(
         renderExpirationTime,
       );
     }
-
-    // We processed the update queue inside updateClassInstance. It may have
-    // included some errors that were dispatched during the commit phase.
-    // TODO: Refactor class components so this is less awkward.
-    let didCaptureError = false;
-    const updateQueue = workInProgress.updateQueue;
-    if (updateQueue !== null && updateQueue.capturedValues !== null) {
-      shouldUpdate = true;
-      didCaptureError = true;
-    }
     return finishClassComponent(
       current,
       workInProgress,
       shouldUpdate,
       hasContext,
-      didCaptureError,
       renderExpirationTime,
     );
   }
@@ -303,12 +303,14 @@ export default function<T, P, I, TI, HI, PI, C, CC, CX, PL>(
     workInProgress: Fiber,
     shouldUpdate: boolean,
     hasContext: boolean,
-    didCaptureError: boolean,
     renderExpirationTime: ExpirationTime,
   ) {
     // Refs should update even if shouldComponentUpdate returns false
     markRef(current, workInProgress);
 
+    const didCaptureError =
+      (workInProgress.effectTag & DidCapture) !== NoEffect;
+
     if (!shouldUpdate && !didCaptureError) {
       // Context providers should defer to sCU for rendering
       if (hasContext) {
@@ -414,7 +416,7 @@ export default function<T, P, I, TI, HI, PI, C, CC, CX, PL>(
     let updateQueue = workInProgress.updateQueue;
     if (updateQueue !== null) {
       const prevState = workInProgress.memoizedState;
-      const state = processUpdateQueue(
+      const state = processLegacyUpdateQueue(
         current,
         workInProgress,
         updateQueue,
@@ -607,20 +609,13 @@ export default function<T, P, I, TI, HI, PI, C, CC, CX, PL>(
       workInProgress.memoizedState =
         value.state !== null && value.state !== undefined ? value.state : null;
 
-      if (typeof Component.getDerivedStateFromProps === 'function') {
-        const partialState = callGetDerivedStateFromProps(
-          workInProgress,
-          value,
-          props,
-          workInProgress.memoizedState,
-        );
-
-        if (partialState !== null && partialState !== undefined) {
-          workInProgress.memoizedState = Object.assign(
-            {},
-            workInProgress.memoizedState,
-            partialState,
-          );
+      const getDerivedStateFromProps = Component.getDerivedStateFromProps;
+      if (typeof getDerivedStateFromProps === 'function') {
+        const update = createDeriveStateFromPropsUpdate(renderExpirationTime);
+        enqueueRenderPhaseUpdate(workInProgress, update, renderExpirationTime);
+        const updateQueue = workInProgress.updateQueue;
+        if (updateQueue !== null) {
+          processUpdateQueue(workInProgress, updateQueue, renderExpirationTime);
         }
       }
 
@@ -635,7 +630,6 @@ export default function<T, P, I, TI, HI, PI, C, CC, CX, PL>(
         workInProgress,
         true,
         hasContext,
-        false,
         renderExpirationTime,
       );
     } else {