[v9] fix!: upgrade reconciler for React 19

example/package.json

@@ -11,8 +11,8 @@
     "@react-spring/three": "^9.7.3",
     "@react-three/drei": "^9.93.0",
     "@use-gesture/react": "latest",
-    "react": "^18.2.0",
-    "react-dom": "^18.2.0",
+    "react": "19.0.0-canary-db913d8e17-20240422",
+    "react-dom": "19.0.0-canary-db913d8e17-20240422",
     "react-merge-refs": "^2.1.1",
     "react-use-refs": "^1.0.1",
     "three": "^0.160.0",

package.json

@@ -49,13 +49,13 @@
     "@changesets/changelog-git": "^0.1.11",
     "@changesets/cli": "^2.22.0",
     "@preconstruct/cli": "^2.1.5",
-    "@testing-library/react": "^13.0.0-alpha.5",
+    "@testing-library/react": "^15.0.2",
     "@types/jest": "^29.2.5",
-    "@types/react": "^18.0.5",
-    "@types/react-dom": "^18.0.1",
+    "@types/react": "18.2.73",
+    "@types/react-dom": "18.2.22",
     "@types/react-native": "0.69.5",
-    "@types/react-test-renderer": "^17.0.1",
-    "@types/scheduler": "^0.16.2",
+    "@types/react-test-renderer": "18.0.7",
+    "@types/scheduler": "0.23.0",
     "@types/three": "^0.141.0",
     "@typescript-eslint/eslint-plugin": "^5.17.0",
     "@typescript-eslint/parser": "^5.17.0",
@@ -76,10 +76,10 @@
     "lint-staged": "^12.3.7",
     "prettier": "^2.6.1",
     "pretty-quick": "^3.1.3",
-    "react": "^18.0.0",
-    "react-dom": "^18.0.0",
+    "react": "19.0.0-beta-94eed63c49-20240425",
+    "react-dom": "19.0.0-beta-94eed63c49-20240425",
     "react-native": "0.69.3",
-    "react-test-renderer": "^18.0.0",
+    "react-test-renderer": "19.0.0-beta-94eed63c49-20240425",
     "regenerator-runtime": "^0.13.9",
     "three": "^0.141.0",
     "three-stdlib": "^2.13.0",

packages/fiber/package.json

@@ -43,13 +43,13 @@
   },
   "dependencies": {
     "@babel/runtime": "^7.17.8",
-    "@types/react-reconciler": "^0.26.7",
+    "@types/react-reconciler": "^0.28.8",
     "base64-js": "^1.5.1",
     "buffer": "^6.0.3",
-    "its-fine": "^1.0.6",
-    "react-reconciler": "^0.27.0",
+    "its-fine": "^1.2.5",
+    "react-reconciler": "0.31.0-beta-94eed63c49-20240425",
     "react-use-measure": "^2.1.1",
-    "scheduler": "^0.21.0",
+    "scheduler": "0.25.0-beta-94eed63c49-20240425",
     "suspend-react": "^0.1.3",
     "zustand": "^4.1.2"
   },
@@ -58,8 +58,8 @@
     "expo-asset": ">=8.4",
     "expo-gl": ">=11.0",
     "expo-file-system": ">=11.0",
-    "react": ">=18.0",
-    "react-dom": ">=18.0",
+    "react": ">=19.0",
+    "react-dom": ">=19.0",
     "react-native": ">=0.69",
     "three": ">=0.141"
   },

packages/fiber/src/core/reconciler.tsx

@@ -1,7 +1,13 @@
 import * as THREE from 'three'
 import * as React from 'react'
 import Reconciler from 'react-reconciler'
-import { ContinuousEventPriority, DiscreteEventPriority, DefaultEventPriority } from 'react-reconciler/constants'
+import {
+  // @ts-ignore
+  NoEventPriority,
+  ContinuousEventPriority,
+  DiscreteEventPriority,
+  DefaultEventPriority,
+} from 'react-reconciler/constants'
 import { unstable_IdlePriority as idlePriority, unstable_scheduleCallback as scheduleCallback } from 'scheduler'
 import {
   diffProps,
@@ -73,7 +79,7 @@ interface HostConfig {
   suspenseInstance: Instance
   hydratableInstance: never
   publicInstance: Instance['object']
-  hostContext: never
+  hostContext: {}
   updatePayload: null | [true] | [false, Instance['props']]
   childSet: never
   timeoutHandle: number | undefined
@@ -238,13 +244,18 @@ function removeChild(
   if (shouldDispose && child.type !== 'primitive' && child.object.type !== 'Scene') {
     if (typeof child.object.dispose === 'function') {
       const dispose = child.object.dispose.bind(child.object)
-      scheduleCallback(idlePriority, () => {
+      const handleDispose = () => {
         try {
           dispose()
         } catch (e) {
-          /* ... */
+          // no-op
         }
-      })
+      }
+
+      // In a testing environment, cleanup immediately
+      if (typeof IS_REACT_ACT_ENVIRONMENT !== 'undefined') handleDispose()
+      // Otherwise, using a real GPU so schedule cleanup to prevent stalls
+      else scheduleCallback(idlePriority, handleDispose)
     }
   }
 
@@ -309,6 +320,37 @@ function switchInstance(
 const handleTextInstance = () =>
   console.warn('R3F: Text is not allowed in JSX! This could be stray whitespace or characters.')
 
+const NO_CONTEXT: HostConfig['hostContext'] = {}
+
+let currentUpdatePriority: number = NoEventPriority
+
+// Effectively removed to diff in commit phase
+// https://github.com/facebook/react/pull/27409
+function prepareUpdate(
+  instance: HostConfig['instance'],
+  _type: string,
+  oldProps: HostConfig['props'],
+  newProps: HostConfig['props'],
+): HostConfig['updatePayload'] {
+  // Reconstruct primitives if object prop changes
+  if (instance.type === 'primitive' && oldProps.object !== newProps.object) return [true]
+
+  // Throw if an object or literal was passed for args
+  if (newProps.args !== undefined && !Array.isArray(newProps.args))
+    throw new Error('R3F: The args prop must be an array!')
+
+  // Reconstruct instance if args change
+  if (newProps.args?.length !== oldProps.args?.length) return [true]
+  if (newProps.args?.some((value, index) => value !== oldProps.args?.[index])) return [true]
+
+  // Create a diff-set, flag if there are any changes
+  const changedProps = diffProps(instance, newProps, true)
+  if (Object.keys(changedProps).length) return [false, changedProps]
+
+  // Otherwise do not touch the instance
+  return null
+}
+
 export const reconciler = Reconciler<
   HostConfig['type'],
   HostConfig['props'],
@@ -324,11 +366,11 @@ export const reconciler = Reconciler<
   HostConfig['timeoutHandle'],
   HostConfig['noTimeout']
 >({
-  supportsMutation: true,
   isPrimaryRenderer: false,
+  warnsIfNotActing: false,
+  supportsMutation: true,
   supportsPersistence: false,
   supportsHydration: false,
-  noTimeout: -1,
   createInstance,
   removeChild,
   appendChild,
@@ -352,29 +394,20 @@ export const reconciler = Reconciler<
 
     insertBefore(scene, child, beforeChild)
   },
-  getRootHostContext: () => null,
-  getChildHostContext: (parentHostContext) => parentHostContext,
-  prepareUpdate(instance, _type, oldProps, newProps) {
-    // Reconstruct primitives if object prop changes
-    if (instance.type === 'primitive' && oldProps.object !== newProps.object) return [true]
-
-    // Throw if an object or literal was passed for args
-    if (newProps.args !== undefined && !Array.isArray(newProps.args))
-      throw new Error('R3F: The args prop must be an array!')
-
-    // Reconstruct instance if args change
-    if (newProps.args?.length !== oldProps.args?.length) return [true]
-    if (newProps.args?.some((value, index) => value !== oldProps.args?.[index])) return [true]
-
-    // Create a diff-set, flag if there are any changes
-    const changedProps = diffProps(instance, newProps, true)
-    if (Object.keys(changedProps).length) return [false, changedProps]
-
-    // Otherwise do not touch the instance
-    return null
-  },
-  commitUpdate(instance, diff, type, _oldProps, newProps, fiber) {
-    const [reconstruct, changedProps] = diff!
+  getRootHostContext: () => NO_CONTEXT,
+  getChildHostContext: () => NO_CONTEXT,
+  // @ts-ignore prepareUpdate and updatePayload removed with React 19
+  commitUpdate(
+    instance: HostConfig['instance'],
+    type: HostConfig['type'],
+    oldProps: HostConfig['props'],
+    newProps: HostConfig['props'],
+    fiber: any,
+  ) {
+    const diff = prepareUpdate(instance, type, oldProps, newProps)
+    if (diff === null) return
+
+    const [reconstruct, changedProps] = diff
 
     // Reconstruct when args or <primitive object={...} have changes
     if (reconstruct) return switchInstance(instance, type, newProps, fiber)
@@ -417,23 +450,40 @@ export const reconciler = Reconciler<
   hideTextInstance: handleTextInstance,
   unhideTextInstance: handleTextInstance,
   // SSR fallbacks
-  now:
-    typeof performance !== 'undefined' && typeof performance.now === 'function'
-      ? performance.now
-      : typeof Date.now === 'function'
-      ? Date.now
-      : () => 0,
   scheduleTimeout: (typeof setTimeout === 'function' ? setTimeout : undefined) as any,
   cancelTimeout: (typeof clearTimeout === 'function' ? clearTimeout : undefined) as any,
-  // @ts-ignore Deprecated experimental APIs
-  // https://github.com/facebook/react/blob/main/packages/shared/ReactFeatureFlags.js
-  // https://github.com/pmndrs/react-three-fiber/pull/2360#discussion_r916356874
-  beforeActiveInstanceBlur: () => {},
-  afterActiveInstanceBlur: () => {},
-  detachDeletedInstance: () => {},
-  // Gives React a clue as to how import the current interaction is
-  // https://github.com/facebook/react/tree/main/packages/react-reconciler#getcurrenteventpriority
-  getCurrentEventPriority() {
+  noTimeout: -1,
+  getInstanceFromNode: () => null,
+  beforeActiveInstanceBlur() {},
+  afterActiveInstanceBlur() {},
+  detachDeletedInstance() {},
+  // @ts-ignore untyped react-experimental options inspired by react-art
+  // TODO: add shell types for these and upstream to DefinitelyTyped
+  // https://github.com/facebook/react/blob/main/packages/react-art/src/ReactFiberConfigART.js
+  shouldAttemptEagerTransition() {
+    return false
+  },
+  requestPostPaintCallback() {},
+  maySuspendCommit() {
+    return false
+  },
+  preloadInstance() {
+    return true // true indicates already loaded
+  },
+  startSuspendingCommit() {},
+  suspendInstance() {},
+  waitForCommitToBeReady() {
+    return null
+  },
+  NotPendingTransition: null,
+  setCurrentUpdatePriority(newPriority: number) {
+    currentUpdatePriority = newPriority
+  },
+  getCurrentUpdatePriority() {
+    return currentUpdatePriority
+  },
+  resolveUpdatePriority() {
+    if (currentUpdatePriority) return currentUpdatePriority
     if (!globalScope) return DefaultEventPriority
 
     const name = globalScope.event?.type

packages/fiber/src/core/renderer.tsx

@@ -207,7 +207,19 @@ export function createRoot<TCanvas extends Canvas>(canvas: TCanvas): ReconcilerR
   const store = prevStore || createStore(invalidate, advance)
   // Create renderer
   const fiber =
-    prevFiber || reconciler.createContainer(store, ConcurrentRoot, null, false, null, '', logRecoverableError, null)
+    prevFiber ||
+    (reconciler as any).createContainer(
+      store, // container
+      ConcurrentRoot, // tag
+      null, // hydration callbacks
+      false, // isStrictMode
+      null, // concurrentUpdatesByDefaultOverride
+      '', // identifierPrefix
+      logRecoverableError, // onUncaughtError
+      logRecoverableError, // onCaughtError
+      logRecoverableError, // onRecoverableError
+      null, // transitionCallbacks
+    )
   // Map it
   if (!prevRoot) _roots.set(canvas, { fiber, store })
 

packages/fiber/src/core/utils.tsx

@@ -38,7 +38,7 @@ export type Act = <T = any>(cb: () => Promise<T>) => Promise<T>
 /**
  * Safely flush async effects when testing, simulating a legacy root.
  */
-export const act: Act = (React as any).unstable_act
+export const act: Act = (React as any).act
 
 export type Camera = (THREE.OrthographicCamera | THREE.PerspectiveCamera) & { manual?: boolean }
 export const isOrthographicCamera = (def: Camera): def is THREE.OrthographicCamera =>

packages/fiber/tests/canvas.native.test.tsx

@@ -61,6 +61,6 @@ describe('native Canvas', () => {
       ),
     )
 
-    expect(() => renderer.unmount()).not.toThrow()
+    expect(async () => await act(async () => renderer.unmount())).not.toThrow()
   })
 })

packages/fiber/tests/renderer.test.tsx

@@ -24,20 +24,14 @@ extend({ Mock })
 
 type ComponentMesh = THREE.Mesh<THREE.BoxBufferGeometry, THREE.MeshBasicMaterial>
 
-const expectToThrow = async (callback: () => any) => {
-  const error = console.error
-  console.error = jest.fn()
-
-  let thrown = false
+const expectToThrow = async (callback: () => any, message: string) => {
+  let error: Error | undefined
   try {
     await callback()
-  } catch (_) {
-    thrown = true
+  } catch (e) {
+    error = e as Error
   }
-
-  expect(thrown).toBe(true)
-  expect(console.error).toBeCalled()
-  console.error = error
+  expect(error?.message).toBe(message)
 }
 
 describe('renderer', () => {
@@ -256,8 +250,8 @@ describe('renderer', () => {
 
     // Throw on non-array value
     await expectToThrow(
-      // @ts-expect-error
-      async () => await act(async () => root.render(<Test args={{}} />)),
+      async () => await act(async () => root.render(<Test args={{} as any} />)),
+      'R3F: The args prop must be an array!',
     )
 
     // Set
@@ -316,8 +310,8 @@ describe('renderer', () => {
 
     // Throw on undefined
     await expectToThrow(
-      // @ts-expect-error
-      async () => await act(async () => root.render(<Test object={undefined} />)),
+      async () => await act(async () => root.render(<Test object={undefined as any} />)),
+      "R3F: Primitives without 'object' are invalid!",
     )
 
     // Update
@@ -397,21 +391,21 @@ describe('renderer', () => {
     // Removes events
     expect(internal.interaction.length).toBe(0)
     // Calls dispose on top-level instance
-    expect(dispose).toBeCalled()
+    expect(dispose).toHaveBeenCalled()
     // Also disposes of children
-    expect(childDispose).toBeCalled()
+    expect(childDispose).toHaveBeenCalled()
     // Disposes of attached children
-    expect(attachDispose).toBeCalled()
+    expect(attachDispose).toHaveBeenCalled()
     // Properly detaches attached children
-    expect(attach).toBeCalledTimes(1)
-    expect(detach).toBeCalledTimes(1)
+    expect(attach).toHaveBeenCalledTimes(1)
+    expect(detach).toHaveBeenCalledTimes(1)
     // Respects dispose={null}
-    expect(flagDispose).not.toBeCalled()
+    expect(flagDispose).not.toHaveBeenCalled()
     // Does not dispose of primitives
-    expect(object.dispose).not.toBeCalled()
+    expect(object.dispose).not.toHaveBeenCalled()
     // Only disposes of declarative primitive children
-    expect(objectExternal.dispose).not.toBeCalled()
-    expect(disposeDeclarativePrimitive).toBeCalled()
+    expect(objectExternal.dispose).not.toHaveBeenCalled()
+    expect(disposeDeclarativePrimitive).toHaveBeenCalled()
   })
 
   it('can swap 4 array primitives', async () => {