From 38f668f95f82c7bf1fb4a893edf220d1320ebfcc Mon Sep 17 00:00:00 2001
From: Rick Hanlon <rickhanlonii@gmail.com>
Date: Tue, 26 Jan 2021 17:09:51 -0700
Subject: [PATCH] Queue discrete events in microtask

---
 packages/react-art/src/ReactARTHostConfig.js      |  3 +++
 .../react-dom/src/client/ReactDOMHostConfig.js    | 15 +++++++++++++++
 .../src/ReactFabricHostConfig.js                  |  3 +++
 .../src/ReactNativeHostConfig.js                  |  3 +++
 .../src/ReactTestHostConfig.js                    | 15 +++++++++++++++
 5 files changed, 39 insertions(+)

diff --git a/packages/react-art/src/ReactARTHostConfig.js b/packages/react-art/src/ReactARTHostConfig.js
index 43a563e90aa23..ad2d73062240e 100644
--- a/packages/react-art/src/ReactARTHostConfig.js
+++ b/packages/react-art/src/ReactARTHostConfig.js
@@ -330,6 +330,9 @@ export function getChildHostContext() {
 export const scheduleTimeout = setTimeout;
 export const cancelTimeout = clearTimeout;
 export const noTimeout = -1;
+export function queueMicrotask() {
+  invariant(false, 'Not implemented.');
+}
 
 export function shouldSetTextContent(type, props) {
   return (
diff --git a/packages/react-dom/src/client/ReactDOMHostConfig.js b/packages/react-dom/src/client/ReactDOMHostConfig.js
index 8de2f2c5c7ca4..c0f0c52fdbb86 100644
--- a/packages/react-dom/src/client/ReactDOMHostConfig.js
+++ b/packages/react-dom/src/client/ReactDOMHostConfig.js
@@ -384,6 +384,21 @@ export const scheduleTimeout: any =
 export const cancelTimeout: any =
   typeof clearTimeout === 'function' ? clearTimeout : (undefined: any);
 export const noTimeout = -1;
+export const queueMicrotask: (Function => void) | undefined =
+  typeof queueMicrotask === 'function'
+    ? queueMicrotask
+    : typeof Promise !== 'undefined'
+    ? callback =>
+        Promise.resolve(null)
+          .then(callback)
+          .catch(handleErrorInNextTick)
+    : scheduleTimeout;
+
+function handleErrorInNextTick(error) {
+  setTimeout(() => {
+    throw error;
+  });
+}
 
 // -------------------
 //     Mutation
diff --git a/packages/react-native-renderer/src/ReactFabricHostConfig.js b/packages/react-native-renderer/src/ReactFabricHostConfig.js
index 636542e8d426b..a960f26c5fd0a 100644
--- a/packages/react-native-renderer/src/ReactFabricHostConfig.js
+++ b/packages/react-native-renderer/src/ReactFabricHostConfig.js
@@ -348,6 +348,9 @@ export const warnsIfNotActing = false;
 export const scheduleTimeout = setTimeout;
 export const cancelTimeout = clearTimeout;
 export const noTimeout = -1;
+export function queueMicrotask() {
+  invariant(false, 'Not implemented.');
+}
 
 // -------------------
 //     Persistence
diff --git a/packages/react-native-renderer/src/ReactNativeHostConfig.js b/packages/react-native-renderer/src/ReactNativeHostConfig.js
index eba0a2b90462b..69cb665d26d03 100644
--- a/packages/react-native-renderer/src/ReactNativeHostConfig.js
+++ b/packages/react-native-renderer/src/ReactNativeHostConfig.js
@@ -247,6 +247,9 @@ export const warnsIfNotActing = true;
 export const scheduleTimeout = setTimeout;
 export const cancelTimeout = clearTimeout;
 export const noTimeout = -1;
+export function queueMicrotask() {
+  invariant(false, 'Not implemented.');
+}
 
 export function shouldSetTextContent(type: string, props: Props): boolean {
   // TODO (bvaughn) Revisit this decision.
diff --git a/packages/react-test-renderer/src/ReactTestHostConfig.js b/packages/react-test-renderer/src/ReactTestHostConfig.js
index a6d661d5fe9cc..eb5ceaa51404b 100644
--- a/packages/react-test-renderer/src/ReactTestHostConfig.js
+++ b/packages/react-test-renderer/src/ReactTestHostConfig.js
@@ -220,6 +220,21 @@ export const warnsIfNotActing = true;
 
 export const scheduleTimeout = setTimeout;
 export const cancelTimeout = clearTimeout;
+export const queueMicrotask =
+  typeof queueMicrotask === 'function'
+    ? queueMicrotask
+    : typeof Promise !== 'undefined'
+    ? callback =>
+        Promise.resolve(null)
+          .then(callback)
+          .catch(handleErrorInNextTick)
+    : scheduleTimeout;
+
+function handleErrorInNextTick(error) {
+  setTimeout(() => {
+    throw error;
+  });
+}
 export const noTimeout = -1;
 
 // -------------------