The bindings upstream in Relay has been removed so we don't need these
builds anymore. The idea is to revisit an FB integration of Flight but
it wouldn't use the Relay specific bindings. It's a bit unclear how it
would look but likely more like the OSS version so not worth keeping
these around.
The `dom-relay` name also included the FB specific Fizz implementation
of the streaming config so I renamed that to `dom-fb`. There's no Fizz
implementation for Native yet so I just removed `native-relay`.
We created a configurable fork for how to encode the output of Flight
and the Relay implementation encoded it as JSON objects instead of
strings/streams. The new implementation would likely be more stream-like
and just encode it directly as string/binary chunks. So I removed those
indirections so that this can just be declared inline in
ReactFlightServer/Client.
## Summary
To support incremental adoption of bridgeless logic we want to default
to using these globals whenever they're available.
## How did you test this change?
https://github.com/facebook/react-native/pull/37410
The idea is that the default `yarn test` command should be the one that
includes the most bleeding edge features, because during development you
probably want as many features enabled as possible.
That used to be `www-modern` but nowadays it's `experimental` because
we've landed a bunch of async actions stuff in experimental but it isn't
yet being tested at Meta.
So this switches the default to `experimental`.
Just a small upgrade to keep us current and remove unused suppressions
(probably fixed by some upgrade since).
- `*` is no longer allowed and has been an alias for `any` for a while
now.
- The whole project root is included by default anyway, the include
section should be redundant and just misleading.
- The generated ignore paths ignore more than intended as they didn't
escape the `.` for regex.
Test Plan:
- wait for CI
- tested the ignore pattern change with renaming files and seeing the
expected files ignored for flow
This automatically exposes `$$FORM_ACTIONS` on Server References coming
from Flight. So that when they're used in a form action, we can encode
the ID for the server reference as a hidden field or as part of the name
of a button.
If the Server Action is a bound function it can have complex data
associated with it. In this case this additional data is encoded as
additional form fields.
To process a POST on the server there's now a `decodeAction` helper that
can take one of these progressive posts from FormData and give you a
function that is prebound with the correct closure and FormData so that
you can just invoke it.
I updated the fixture which now has a "Server State" that gets
automatically refreshed. This also lets us visualize form fields.
There's no "Action State" here for showing error messages that are not
thrown, that's still up to user space.
The "next" prerelease channel represents what will be published the next
time we do a stable release. We publish a new "next" release every day
using a timed CI workflow.
When we introduced this prerelease channel a few years ago, another name
we considered was "canary". But I proposed "next" instead to create a
greater distinction between this channel and the "experimental" channel
(which is published at the same cadence, but includes extra experimental
features), because some other projects use "canary" to refer to releases
that are more unstable than how we would use it.
The main downside of "next" is someone might mistakenly assume the name
refers to Next.js. We were aware of this risk at the time but didn't
think it would be an issue in practice.
However, colloquially, we've ended up referring to this as the "canary"
channel anyway to avoid precisely that confusion.
So after further discussion, we've agreed to rename to "canary".
This affects the label used in the version string (e.g.
`18.3.0-next-a1c2d3e4` becomes `18.3.0-canary-a1c2d3e4`) as well as the
npm dist tags used to publish the releases. For now, I've chosen to
publish the canaries using both `@canary` and `@next` dist tags, so that
downstream consumers who might depend on `@next` have time to adjust. We
can remove that later after the change has been communicated.
Stacked on top of #26735.
This allows a framework to add a `$$FORM_ACTION` property to a function.
This lets the framework return a set of props to use in place of the
function but only during SSR. Effectively, this lets you implement
progressive enhancement of form actions using some other way instead of
relying on the replay feature.
This will be used by RSC on Server References automatically by
convention in a follow up, but this mechanism can also be used by other
frameworks/libraries.
This adds an experimental hook tentatively called useOptimisticState.
(The actual name needs some bikeshedding.)
The headline feature is that you can use it to implement optimistic
updates. If you set some optimistic state during a transition/action,
the state will be automatically reverted once the transition completes.
Another feature is that the optimistic updates will be continually
rebased on top of the latest state.
It's easiest to explain with examples; we'll publish documentation as
the API gets closer to stabilizing. See tests for now.
Technically the use cases for this hook are broader than just optimistic
updates; you could use it implement any sort of "pending" state, such as
the ones exposed by useTransition and useFormStatus. But we expect
people will most often reach for this hook to implement the optimistic
update pattern; simpler cases are covered by those other hooks.
This test started failing recently in older versions of React because
the Scheduler priority inside a microtask is Normal instead of
Immediate. This is expected because microtasks are not Scheduler tasks;
it's an implementation detail.
I gated the test to only run in v17 because it's a regression test for
legacy Suspense behavior, and the implementation details of the snapshot
changed in v18.
Test plan
---------
Using latest:
```
yarn test --build --project devtools --release-channel=experimental profilingcache
```
Using v17 (typically runs in a timed CI workflow):
```
/scripts/circleci/download_devtools_regression_build.js 17.0 --replaceBuild
yarn test --build --project devtools --release-channel=experimental --reactVersion 17.0 profilingcache
```
When there are multiple async actions at the same time, we entangle them
together because we can't be sure which action an update might be
associated with. (For this, we'd need AsyncContext.) However, if one of
the async actions fails with an error, it should only affect that
action, not all the other actions it may be entangled with.
Resolving each action independently also means they can have independent
pending state types, rather than being limited to an `isPending`
boolean. We'll use this to implement an upcoming form API.
## Summary
We added some post-processing in the build for RN in #26616 that broke
for users on Windows due to how line endings were handled to the regular
expression to insert some directives in the docblock. This fixes that
problem, reported in #26697 as well.
## How did you test this change?
Verified files are still built correctly on Mac/Linux. Will ask for help
to test on Windows.
We used to have Event Replaying for any kind of Discrete event where
we'd track any event after hydrateRoot and before the async code/data
has loaded in to hydrate the target. However, this didn't really work
out because code inside event handlers are expected to be able to
synchronously read the state of the world at the time they're invoked.
If we replay discrete events later, the mutable state around them like
selection or form state etc. may have changed.
This limitation doesn't apply to Client Actions:
- They're expected to be async functions that themselves work
asynchronously. They're conceptually also in the "navigation" events
that happen after the "submit" events so they're already not
synchronously even before the first `await`.
- They're expected to operate mostly on the FormData as input which we
can snapshot at the time of the event.
This PR adds a bit of inline script to the Fizz runtime (or external
runtime) to track any early submit events on the page - but only if the
action URL is our placeholder `javascript:` URL. We track a queue of
these on `document.$$reactFormReplay`. Then we replay them in order as
they get hydrated and we get a handle on the Client Action function.
I add the runtime to the `bootstrapScripts` phase in Fizz which is
really technically a little too late, because on a large page, it might
take a while to get to that script even if you have displayed the form.
However, that's also true for external runtime. So there's a very short
window we might miss an event but it's good enough and better than
risking blocking display on this script.
The main thing that makes the replaying difficult to reason about is
that we can have multiple instance of React using this same queue. This
would be very usual but you could have two different Reacts SSR:ing
different parts of the tree and using around the same version. We don't
have any coordinating ids for this. We could stash something on the form
perhaps but given our current structure it's more difficult to get to
the form instance in the commit phase and a naive solution wouldn't
preserve ordering between forms.
This solution isn't 100% guaranteed to preserve ordering between
different React instances neither but should be in order within one
instance which is the common case.
The hard part is that we don't know what instance something will belong
to until it hydrates. So to solve that I keep everything in the original
queue while we wait, so that ordering is preserved until we know which
instance it'll go into. I ended up doing a bunch of clever tricks to
make this work. These could use a lot more tests than I have right now.
Another thing that's tricky is that you can update the action before
it's replayed but we actually want to invoke the old action if that
happens. So we have to extract it even if we can't invoke it right now
just so we get the one that was there during hydration.
We currently use rollup to make an adhoc bundle from the file system
when we're testing an import of an external file.
This doesn't follow all the interception rules that we use in jest and
in our actual builds.
This switches to just using jest require() to load these. This means
that they effectively have to load into the global document so this only
works with global document tests which is all we have now anyway.
Stacked on #26557
Supporting Float methods such as ReactDOM.preload() are challenging for
flight because it does not have an easy means to convey direct
executions in other environments. Because the flight wire format is a
JSON-like serialization that is expected to be rendered it currently
only describes renderable elements. We need a way to convey a function
invocation that gets run in the context of the client environment
whether that is Fizz or Fiber.
Fiber is somewhat straightforward because the HostDispatcher is always
active and we can just have the FlightClient dispatch the serialized
directive.
Fizz is much more challenging becaue the dispatcher is always scoped but
the specific request the dispatch belongs to is not readily available.
Environments that support AsyncLocalStorage (or in the future
AsyncContext) we will use this to be able to resolve directives in Fizz
to the appropriate Request. For other environments directives will be
elided. Right now this is pragmatic and non-breaking because all
directives are opportunistic and non-critical. If this changes in the
future we will need to reconsider how widespread support for async
context tracking is.
For Flight, if AsyncLocalStorage is available Float methods can be
called before and after await points and be expected to work. If
AsyncLocalStorage is not available float methods called in the sync
phase of a component render will be captured but anything after an await
point will be a noop. If a float call is dropped in this manner a DEV
warning should help you realize your code may need to be modified.
This PR also introduces a way for resources (Fizz) and hints (Flight) to
flush even if there is not active task being worked on. This will help
when Float methods are called in between async points within a function
execution but the task is blocked on the entire function finishing.
This PR also introduces deduping of Hints in Flight using the same
resource keys used in Fizz. This will help shrink payload sizes when the
same hint is attempted to emit over and over again
This is the next step toward full support for async form actions.
Errors thrown inside form actions should cause the form to re-render and
throw the error so it can be captured by an error boundary. The behavior
is the same if the `<form />` had an internal useTransition hook, which
is pretty much exactly how we implement it, too.
The first time an action is called, the form's HostComponent is
"upgraded" to become stateful, by lazily mounting a list of hooks. The
rest of the implementation for function components can be shared.
Because the error handling behavior added in this commit is just using
useTransition under-the-hood, it also handles pending states, too.
However, this pending state can't be observed until we add a new hook
for that purpose. I'll add this next.
This puts the change introduced by #26611 behind a flag until Meta is
able to roll it out. Disabling the flag reverts back to the old
behavior, where retries are throttled if there's still data remaining in
the tree, but not if all the data has finished loading.
The new behavior is still enabled in the public builds.
- substr is Annex B
- substring silently flips its arguments if they're in the "wrong order", which is confusing
- slice is better than sliced bread (no pun intended) and also it works the same way on Arrays so there's less to remember
---
> I'd be down to just lint and enforce a single form just for the potential compression savings by using a repeated string.
_Originally posted by @sebmarkbage in https://github.com/facebook/react/pull/26663#discussion_r1170455401_
Some minor changes, observed while working on 24.7.5 release:
- Updated numeration of text instructions
- `reactjs.org` -> `react.dev`
- Fixed using `npm view` command for node 16+, `publish-release` script
currently fails if used with node 16+
We have moved away from HostConfig since the name does not fully
describe the configs we customize per runtime like FlightClient,
FlightServer, Fizz, and Fiber. This commit generalizes $$$hostconfig to
$$$config
part of https://github.com/facebook/react/pull/26571
merging separately to improve tracking of files renames in git
Rename HostConfig files to FiberConfig to clarify they are configs for
Fiber and not Fizz/Flight. This better conforms to the naming used in
Flight and now Fizz of `ReactFlightServerConfig` and `ReactFizzConfig`
`act` uses the `didScheduleLegacyUpdate` field to simulate the behavior
of batching in React <17 and below. It's a quirk leftover from a
previous implementation, not intentionally designed.
This sets `didScheduleLegacyUpdate` every time a legacy root receives an
update as opposed to only when the `executionContext` is empty. There's
no real reason to do it this way over some other way except that it's
how it used to work before #26512 and we should try our best to maintain
the existing behavior, quirks and all, since existing tests may have
come to accidentally rely on it.
This should fix some (though not all) of the internal Meta tests that
started failing after #26512 landed.
Will add a regression test before merging.
## Summary
This adds the ability to create public instances for text nodes in
Fabric. The implementation for the public instances lives in React
Native (as it does for host components after #26437). The logic here
just handles their lazy instantiation when requested via
`getPublicInstanceFromInternalInstanceHandle`, which is called by Fabric
with information coming from the shadow tree.
It's important that the creation of public instances for text nodes is
done lazily to avoid regressing memory usage when unused. Instances for
text nodes are left intact if the public instance is never accessed.
This is necessary to implement access to text nodes in React Native as
explained in
https://github.com/react-native-community/discussions-and-proposals/pull/607
## How did you test this change?
Added unit tests (also fixed a test that was only testing the logic in a
mock :S).
When React receives new input (via `setState`, a Suspense promise
resolution, and so on), it needs to ensure there's a rendering task
associated with the update. Most of this happens
`ensureRootIsScheduled`.
If a single event contains multiple updates, we end up running the
scheduling code once per update. But this is wasteful because we really
only need to run it once, at the end of the event (or in the case of
flushSync, at the end of the scope function's execution).
So this PR moves the scheduling logic to happen in a microtask instead.
In some cases, we will force it run earlier than that, like for
`flushSync`, but since updates are batched by default, it will almost
always happen in the microtask. Even for discrete updates.
In production, this should have no observable behavior difference. In a
testing environment that uses `act`, this should also not have a
behavior difference because React will push these tasks to an internal
`act` queue.
However, tests that do not use `act` and do not simulate an actual
production environment (like an e2e test) may be affected. For example,
before this change, if a test were to call `setState` outside of `act`
and then immediately call `jest.runAllTimers()`, the update would be
synchronously applied. After this change, that will no longer work
because the rendering task (a timer, in this case) isn't scheduled until
after the microtask queue has run.
I don't expect this to be an issue in practice because most people do
not write their tests this way. They either use `act`, or they write
e2e-style tests.
The biggest exception has been... our own internal test suite. Until
recently, many of our tests were written in a way that accidentally
relied on the updates being scheduled synchronously. Over the past few
weeks, @tyao1 and I have gradually converted the test suite to use a new
set of testing helpers that are resilient to this implementation detail.
(There are also some old Relay tests that were written in the style of
React's internal test suite. Those will need to be fixed, too.)
The larger motivation behind this change, aside from a minor performance
improvement, is we intend to use this new microtask to perform
additional logic that doesn't yet exist. Like inferring the priority of
a custom event.
Before a commit is finished if any new stylesheet resources are going to
mount and we are capable of delaying the commit we will do the following
1. Wait for all preloads for newly created stylesheet resources to load
2. Once all preloads are finished we insert the stylesheet instances for
these resources and wait for them all to load
3. Once all stylesheets have loaded we complete the commit
In this PR I also removed the synchronous loadingstate tracking in the
fizz runtime. It was not necessary to support the implementation on not
used by the fizz runtime itself. It makes the inline script slightly
smaller
In this PR I also integrated ReactDOMFloatClient with
ReactDOMHostConfig. It leads to better code factoring, something I
already did on the server a while back. To make the diff a little easier
to follow i make these changes in a single commit so you can look at the
change after that commit if helpful
There is a 500ms timeout which will finish the commit even if all
suspended host instances have not finished loading yet
At the moment error and load events are treated the same and we're
really tracking whether the host instance is finished attempting to
load.
Follow-up to https://github.com/facebook/react/pull/26442.
It looks like we missed a few cases where we default import a CommonJS
module, which leads to Rollup adding `.default` access, e.g.
`require('webpack/lib/Template').default` in the output.
To fix, add the remaining cases to the list of exceptions. Verified by
going through all `externals` in the bundle list, and manually checking
the webpack plugin.
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## Summary
This PR:
- Updates Rollup from 2.x to latest 3.x, and updates associated plugins
- Updates deprecated / altered config settings in the Rollup plugin
pipeline
- Fixes some file extension and import issues related to use of ESM in
`react-dom-webpack-server`
- Removes a now-obsolete `strip-unused-imports` Rollup plugin
- <s>Fixes an _existing_ bug with the Rollup 2.x plugin pipeline on
`main` that was causing parts of `DOMProperty.js` to get left out of the
`react-dom-webpack-server` JS bundles, by adding a new plugin to tell
Rollup to treat that file as if it as side effects</s>
This PR should be functionally identical to the other existing "Rollup 3
upgrade" PR at #26078 . I'm filing this as a near-duplicate because I'm
ready to push this change through ASAP so that I can follow it up with a
PR that adds sourcemap support, that PR's artifact diffing seems like
it's possibly stuck and I want to compare the build results, and I've
got this set up against latest `main`.
<!--
Explain the **motivation** for making this change. What existing problem
does the pull request solve?
-->
This gets React's build setup updated to the latest Rollup version,
which is generally a good practice, but also ensures that any further
Rollup config tweaks can be done using the current Rollup docs as a
reference.
## How did you test this change?
<!--
Demonstrate the code is solid. Example: The exact commands you ran and
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interface.
How exactly did you verify that your PR solves the issue you wanted to
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If you leave this empty, your PR will very likely be closed.
-->
- Made builds from the latest `main`
- Updated Rollup package versions and cross-compared the changes I
needed to make locally to get successful builds vs #26078
- Diffed the output folders between `main` and this PR, and confirmed
that the bundle contents are identical (with the exception of version
strings and the `react-dom-webpack-server` bundle fix re-adding missing
`DOMProperty.js` content)
## Summary
Now that React Native owns the definition for public instances in Fabric
and ReactNativePrivateInterface provides the methods to create instances
and access private fields (see
https://github.com/facebook/react-native/pull/36570), we can remove the
definitions from React.
After this PR, React Native public instances will be opaque types for
React and it will only handle their creation but not their definition.
This will make RN similar to DOM in how public instances are handled.
This is a new version of #26418 which was closed without merging.
## How did you test this change?
* Existing tests.
* Manually synced the changes in this PR to React Native and tested it
end to end in Meta's infra.
When rendering a suspensey resource that we haven't seen before, it may
have loaded in the background while we were rendering. We should yield
to the main thread to see if the load event fires in an immediate task.
For example, if the resource for a link element has already loaded, its
load event will fire in a task right after React yields to the main
thread. Because the continuation task is not scheduled until right
before React yields, the load event will ping React before it resumes.
If this happens, we can resume rendering without showing a fallback.
I don't think this matters much for images, because the `completed`
property tells us whether the image has loaded, and during a non-urgent
render, we never block the main thread for more than 5ms at a time (for
now — we might increase this in the future). It matters more for
stylesheets because the only way to check if it has loaded is by
listening for the load event.
This is essentially the same trick that `use` does for userspace
promises, but a bit simpler because we don't need to replay the host
component's begin phase; the work-in-progress fiber already completed,
so we can just continue onto the next sibling without any additional
work.
As part of this change, I split the `shouldSuspendCommit` host config
method into separate `maySuspendCommit` and `preloadInstance` methods.
Previously `shouldSuspendCommit` was used for both.
This raised a question of whether we should preload resources during a
synchronous render. My initial instinct was that we shouldn't, because
we're going to synchronously block the main thread until the resource is
inserted into the DOM, anyway. But I wonder if the browser is able to
initiate the preload even while the main thread is blocked. It's
probably a micro-optimization either way because most resources will be
loaded during transitions, not urgent renders.
CircleCI now enforces passing a token when fetching artifacts. I'm also
deleting the old request-promise-json dependency because AFAIK we were
only using it to fetch json from circleci about the list of available
artifacts – which we can just do using node-fetch. Plus, the underlying
request package it uses has been deprecated since 2019.
This doesn't need its own set of flags. We use things like `__PROFILE__`
in the regular feature flags file to fork for the `react-dom/profiling`
build so we can do the same here if needed but I don't think we actually
need to fork this anywhere as far as I can tell.
## Summary
The current definition of `Instance` in Fabric has 2 fields:
- `node`: reference to the native node in the shadow tree.
- `canonical`: public instance provided to users via refs + some
internal fields needed by Fabric.
We're currently using `canonical` not only as the public instance, but
also to store internal properties that Fabric needs to access in
different parts of the codebase. Those properties are, in fact,
available through refs as well, which breaks encapsulation.
This PR splits that into 2 separate fields, leaving the definition of
instance as:
- `node`: reference to the native node in the shadow tree.
- `publicInstance`: public instance provided to users via refs.
- Rest of internal fields needed by Fabric at the instance level.
This also migrates all the current usages of `canonical` to use the
right property depending on the use case.
To improve encapsulation (and in preparation for the implementation of
this [proposal to bring some DOM APIs to public instances in React
Native](https://github.com/react-native-community/discussions-and-proposals/pull/607)),
this also **moves the creation of and the access to the public instance
to separate modules** (`ReactFabricPublicInstance` and
`ReactFabricPublicInstanceUtils`). In a following diff, that module will
be moved into the `react-native` repository and we'll access it through
`ReactNativePrivateInterface`.
## How did you test this change?
Existing unit tests.
Manually synced the PR in Meta infra and tested in Catalyst + the
integration with DevTools. Everything is working normally.
Adding `.internal` to a test file prevents it from being tested in build
mode. The best practice is to instead gate the test based on whether the
feature is enabled.
Ideally we'd use the `@gate` pragma in these tests, but the `itRenders`
test helpers don't support that.
The www builds include disableLegacyContext as a dynamic flag, so we
should be running the tests in that mode, too. Previously we were
overriding the flag during the test run. This strategy usually doesn't
work because the flags get compiled out in the final build, but we
happen to not test www in build mode, only source.
To get of this hacky override, I added a test gate to every test that
uses legacy context. When we eventually remove legacy context from the
codebase, this should make it slightly easier to find which tests are
affected. And removes one more hack from our hack-ridden test config.
Given that sometimes www has features enabled that aren't on in other
builds, we might want to consider testing its build artifacts in CI,
rather than just source. That would have forced this cleanup to happen
sooner. Currently we only test the public builds in CI.
If something throws as a result of `flushSync`, and there's remaining
work left in the queue, React should keep working until all the work is
complete.
If multiple errors are thrown, React will combine them into an
AggregateError object and throw that. In environments where
AggregateError is not available, React will rethrow in an async task.
(All the evergreen runtimes support AggregateError.)
The scenario where this happens is relatively rare, because `flushSync`
will only throw if there's no error boundary to capture the error.
This adds `encodeReply` to the Flight Client and `decodeReply` to the
Flight Server.
Basically, it's a reverse Flight. It serializes values passed from the
client to the server. I call this a "Reply". The tradeoffs and
implementation details are a bit different so it requires its own
implementation but is basically a clone of the Flight Server/Client but
in reverse. Either through callServer or ServerContext.
The goal of this project is to provide the equivalent serialization as
passing props through RSC to client. Except React Elements and
Components and such. So that you can pass a value to the client and back
and it should have the same serialization constraints so when we add
features in one direction we should mostly add it in the other.
Browser support for streaming request bodies are currently very limited
in that only Chrome supports it. So this doesn't produce a
ReadableStream. Instead `encodeReply` produces either a JSON string or
FormData. It uses a JSON string if it's a simple enough payload. For
advanced features it uses FormData. This will also let the browser
stream things like File objects (even though they're not yet supported
since it follows the same rules as the other Flight).
On the server side, you can either consume this by blocking on
generating a FormData object or you can stream in the
`multipart/form-data`. Even if the client isn't streaming data, the
network does. On Node.js busboy seems to be the canonical library for
this, so I exposed a `decodeReplyFromBusboy` in the Node build. However,
if there's ever a web-standard way to stream form data, or if a library
wins in that space we can support it. We can also just build a multipart
parser that takes a ReadableStream built-in.
On the server, server references passed as arguments are loaded from
Node or Webpack just like the client or SSR does. This means that you
can create higher order functions on the client or server. This can be
tokenized when done from a server components but this is a security
implication as it might be tempting to think that these are not fungible
but you can swap one function for another on the client. So you have to
basically treat an incoming argument as insecure, even if it's a
function.
I'm not too happy with the naming parity:
Encode `server.renderToReadableStream` Decode: `client.createFromFetch`
Decode `client.encodeReply` Decode: `server.decodeReply`
This is mainly an implementation details of frameworks but it's annoying
nonetheless. This comes from that `renderToReadableStream` does do some
"rendering" by unwrapping server components etc. The `create` part comes
from the parity with Fizz/Fiber where you `render` on the server and
`create` a root on the client.
Open to bike-shedding this some more.
---------
Co-authored-by: Josh Story <josh.c.story@gmail.com>
