This fixes a bug introduced in React 16.6.0, which was not present in 16.5.2.
Runtimes without setTimeout and clearTimeout (e.g. ClearScript for .NET) are now crashing just by importing react-dom.
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Support React.memo

Resolves #1193
Commit 4d85b12

Remove React.pure (since it was never released in a stable) and add support for React.memo. Preserve previous custom displayName semantics.
Code
f...

A declarative, efficient, and flexible JavaScript library for building user interfaces. - facebook/react

In this RFC, we propose introducing Hooks to React. See the RFC and the documentation for more details.
https://reactjs.org/docs/hooks-overview.html
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This RFC proposes a useSerializable hook to automate the extraction, and subsequent hydration of serializable server-side data.

I figured out a simpler way to do #14181. It does allocate some but I think that's OK. Time complexity might even be better since we avoid the nested loops the old one had.

With the deprecation, of Relay Classic it no longer makes sense to maintain this plugin.
cc @bvaughn
[Testing]
I follow the existing instructions for test in Chrome, Firefox and standalone, making ...

The behavior of timed-out Suspense trees is unique. Rather than unmount the timed out content (and possibly lose important state) React re-parents this content within a hidden Fragment while the fa...

This started out as a part of #13613 which will probably be closed.

Fixes #13874
Alternative to #13877
This first adds an allocator that keeps track of a unique ThreadID index for each currently executing partial renderer. IDs are not just growing but are reused as...

Scheduler needs to schedule a task that fires after paint. To do this, it currently posts a message event to window. This happens on every frame until the queue is empty. An unfortunate consequence...

This blog site has been archived. Go to react.dev/blog to see the recent posts. This year’s React Conf took place on October 25 and 26 in Henderson, Nevada, where more than 600 attendees gathered to discuss the latest in UI engineering. Sophie Alpert and…

16.6.3 (November 12, 2018)
React DOM

Fix bugs in Suspense and lazy. (@acdlite in #14133, #14157, and #14164)
Fix highlighting of React.memo updates in React DevTools. (@bvaughn in #14141)
Fix inte...

This is a very early stage proposal. I'm opening this RFC as a way to explain the problem space. We're still exploring alternative solutions. If this were an ECMAScript proposal it'd be...

In this RFC, we propose introducing Hooks to React. See the RFC and the documentation for more details.
https://reactjs.org/docs/hooks-overview.html
View formatted RFC
(The talk video has now been ...

In the process of switching to MessageChannel, it seems the postMessage call was modified to pass "*" (originally the target origin value from window.postMessage). This actually ends up t...

Spiritual successor to #14267.
Only fixes it for stable builds (which IMO is a fair tradeoff).

A JavaScript library for building user interfaces

This PR is a follow up to #14218. In that PR, fields that we were unsure about were nulled out. This changes the nulling out of fields to the two that we know are safe to null out – specifically, m...

Related to #14224.
This adds a new warning when you reassign this.props during rendering. This has never been supported but apparently some libraries (like deprecated react-css-modules) do that.
Si...

Our build tooling was super outdated, which made maintenance kind of a chore. I think this step, while not totally necessary, will help with issues like #1214 and #1090.
Build sizes
I also decided ...