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Andrew Clark 1e3b6192b5 Import Scheduler directly, not via host config (#14984 )

* Import Scheduler directly, not via host config

We currently schedule asynchronous tasks via the host config. (The host
config is a static/build-time dependency injection system that varies
across different renderers — DOM, native, test, and so on.) Instead of
calling platform APIs like `requestIdleCallback` directly, each renderer
implements a method called `scheduleDeferredCallback`.

We've since discovered that when scheduling tasks, it's crucial that
React work is placed in the same queue as other, non-React work on the
main thread. Otherwise, you easily end up in a starvation scenario where
rendering is constantly interrupted by less important tasks. You need a
centralized coordinator that is used both by React and by other
frameworks and application code. This coordinator must also have a
consistent API across all the different host environments, for
convention's sake and so product code is portable — e.g. so the same
component can work in both React Native and React Native Web.

This turned into the Scheduler package. We will have different builds of
Scheduler for each of our target platforms. With this approach, we treat
Scheduler like a built-in platform primitive that exists wherever React
is supported.

Now that we have this consistent interface, the indirection of the host
config no longer makes sense for the purpose of scheduling tasks. In
fact, we explicitly do not want renderers to scheduled task via any
system except the Scheduler package.

So, this PR removes `scheduleDeferredCallback` and its associated
methods from the host config in favor of directly importing Scheduler.

* Missed an extraneous export

2019-03-06 14:41:45 -08:00

npm

Use Yarn Workspaces (#11252 )

2017-10-19 00:22:21 +01:00

src

Import Scheduler directly, not via host config (#14984 )

2019-03-06 14:41:45 -08:00

index.js

Drop the year from Facebook copyright headers and the LICENSE file. (#13593 )

2018-09-07 15:11:23 -07:00

package.json

16.8.4 and changelog

2019-03-05 15:17:42 -08:00

README.md

Update react-dom README

2018-09-06 15:27:06 +01:00

README.md

`react`

React is a JavaScript library for creating user interfaces.

The react package contains only the functionality necessary to define React components. It is typically used together with a React renderer like react-dom for the web, or react-native for the native environments.

Note: by default, React will be in development mode. The development version includes extra warnings about common mistakes, whereas the production version includes extra performance optimizations and strips all error messages. Don't forget to use the production build when deploying your application.

Example Usage

var React = require('react');