Merge branch 'master' of https://github.com/facebook/react

abhyuday · abhyuday · commit 8e1db1a27c27 · 2020-10-22T10:32:36.000+05:30
diff --git a/packages/react-reconciler/src/ReactFiberLane.js b/packages/react-reconciler/src/ReactFiberLane.js
@@ -640,7 +640,13 @@ export function higherLanePriority(
 }
 
 export function createLaneMap<T>(initial: T): LaneMap<T> {
-  return new Array(TotalLanes).fill(initial);
+  // Intentionally pushing one by one.
+  // https://v8.dev/blog/elements-kinds#avoid-creating-holes
+  const laneMap = [];
+  for (let i = 0; i < TotalLanes; i++) {
+    laneMap.push(initial);
+  }
+  return laneMap;
 }
 
 export function markRootUpdated(
diff --git a/yarn.lock b/yarn.lock
@@ -11536,12 +11536,12 @@ react-native-web@0.0.0-26873b469:
     react-timer-mixin "^0.13.4"
 
 react-shallow-renderer@^16.13.1:
-  version "16.13.1"
-  resolved "https://registry.yarnpkg.com/react-shallow-renderer/-/react-shallow-renderer-16.13.1.tgz#4cfd6dc0f05a8d4d261ff7a80e9b88f15491a00a"
-  integrity sha512-hLmExm5/ZnjodLgm/4oxYw4i7fL6LLPhbO9mF/4tmaZUurtLrp2aSeDHZmRk0SVCHXPz0VaEbb3Dqi5J7odz7Q==
+  version "16.14.1"
+  resolved "https://registry.yarnpkg.com/react-shallow-renderer/-/react-shallow-renderer-16.14.1.tgz#bf0d02df8a519a558fd9b8215442efa5c840e124"
+  integrity sha512-rkIMcQi01/+kxiTE9D3fdS959U1g7gs+/rborw++42m1O9FAQiNI/UNRZExVUoAOprn4umcXf+pFRou8i4zuBg==
   dependencies:
     object-assign "^4.1.1"
-    react-is "^16.12.0"
+    react-is "^16.12.0 || ^17.0.0"
 
 react-timer-mixin@^0.13.4:
   version "0.13.4"

Original file line number	Diff line number	Diff line change
`@@ -640,7 +640,13 @@ export function higherLanePriority(`
`640`	`640`	`}`
`641`	`641`
`642`	`642`	`export function createLaneMap<T>(initial: T): LaneMap<T> {`
`643`		`- return new Array(TotalLanes).fill(initial);`
	`643`	`+ // Intentionally pushing one by one.`
	`644`	`+ // https://v8.dev/blog/elements-kinds#avoid-creating-holes`
	`645`	`+ const laneMap = [];`
	`646`	`+ for (let i = 0; i < TotalLanes; i++) {`
	`647`	`+ laneMap.push(initial);`
	`648`	`+ }`
	`649`	`+ return laneMap;`
`644`	`650`	`}`
`645`	`651`
`646`	`652`	`export function markRootUpdated(`