Queue discrete events in microtask

Author: rickhanlonii

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 (

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

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

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.

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;
 
 // -------------------