Summary:
1. We expose the `initialAppState` for Android in #19935, so we can remove the fallback check for Android.
2. Rename `RCTCurrentAppBackgroundState` to `RCTCurrentAppState`, it's a private file function, so it's safe to rename, `RCTCurrentAppState` is more suitable because we actually get app state, not app background state.
[Android] [Enhancement] - Remove android `initialAppState` fallback check.
Pull Request resolved: https://github.com/facebook/react-native/pull/23487
Differential Revision: D14121293
Pulled By: cpojer
fbshipit-source-id: fec196cef2969fe6f6f1571f4ebcafcec26266a1
Summary: The hacks we added for lazy viewmanagers don't really apply to TurboModule lookup system, so let's enable lazy lookup as needed only if TurboModule is enabled.
Reviewed By: PeteTheHeat
Differential Revision: D14116548
fbshipit-source-id: 701e963ef0593cd890198725f8cb6d0d29434cd9
Summary:
Context: https://fb.workplace.com/groups/735885229793428/permalink/2329819300400005/
A large number of RN SSTs (https://fburl.com/screenshot_tests/itlks3mn) stopped working last week. Turns out I silently broke them with D13981728.
The issue is that SSTs were being run with `RCTRunningInTestEnvironment == false`. When D13981728 changed that, borders began drawing from a different code path (this diff). Somehow, using the graphics context to draw borders breaks https://fburl.com/pcce4y0h in SSTs.
Going forward, it doesn't make any sense to me why borders should be drawn any differently when testing.
Reviewed By: sahrens
Differential Revision: D14109654
fbshipit-source-id: b8a5c01b923c93c32a8fa8954a850070f55764bc
Summary:
There's a very old issue with reload logic: invalidation and resetting up of the bridge could be racing. In this case, we hit a redbox when:
* Chrome debugger is enabled in previous app run, then we launch the app again
* The bridge starts, then immediately reloads itself to connect to Chrome
* On the 2nd setup, the logic to update the green loading bar, with the % indicator for loading off metro, failed to find the DevLoadingView module instance because the bridge is in the middle of invalidating
See https://github.com/facebook/react-native/issues/23235
To test:
Using react-native init from github, do the steps in https://github.com/facebook/react-native/issues/23235, no more redbox. Note that the loading indicator % won't be proper still, but at least it doesn't crash/redbox.
Reviewed By: JoshuaGross
Differential Revision: D14110814
fbshipit-source-id: 835061e50acc6968bffbcc2ddfbe8da79a100df9
Summary:
React native is missing a keyboard type for iOS so I included support for it. So it can be used in react native app
https://developer.apple.com/documentation/uikit/uikeyboardtype/uikeyboardtypeasciicapablenumberpad
Thank you for sending the PR! We appreciate you spending the time to work on these changes.
Help us understand your motivation by explaining why you decided to make this change.
If this PR fixes an issue, type "Fixes #issueNumber" to automatically close the issue when the PR is merged.
Pull Request resolved: https://github.com/facebook/react-native/pull/20597
Differential Revision: D14103498
Pulled By: cpojer
fbshipit-source-id: b0aa17f3e527734c6e90eadc73c96db4dd002698
Summary:
Regression, fix image load from `~/Library` not respect scale factor.
Fixes#22383 , the bug comes from [Clean up some URL path handling](998197f444).
[iOS] [Fixed] - Fix image wrong scale factor when load image from file system
Pull Request resolved: https://github.com/facebook/react-native/pull/23446
Differential Revision: D14099614
Pulled By: cpojer
fbshipit-source-id: eb2267b195a05eb70cdc4671536a4c1d47fb03e2
Summary:
This adds a new jsi API prepareJavaScript. This accepts the same
parameters as evaluateJavaScript() but does not evaluate anything; instead
it returns a new object PreparedJavaScript which can itself be evaluated,
via the new API evaluatePreparedJavaScript().
There is a new empty class PreparedJavaScript which may be subclassed by
each Runtime variant to store its particular prepared form.
Reviewed By: mhorowitz
Differential Revision: D10491585
fbshipit-source-id: 702b9e23f2ff03d71a8ab17efb7e154b16dd8e87
Summary:
Sometimes, when we deal with ImageRequest and ImageResponseObserverCoordinator we subscribe for status (or access the coordinator) without owning an ImageRequest. In those cases, we have to retain the coordinator explicitly.
For those cases, ImageRequest now exposes `ImageResponseObserverCoordinator` as a `std::shared_ptr`.
Eg, concretely in the code, `completionBlock` and `progressBlock` copied a raw pointer to the observer inside which can lead to a crash when ImageRequest is being deallocated before we received an image data.
Reviewed By: JoshuaGross
Differential Revision: D14072079
fbshipit-source-id: e10120bc05bf685e288f7b3d69092714dcd91d43
Summary:
https://our.intern.facebook.com/intern/sandcastle/job/18014398585083744
```
xplat/js/react-native-github/React/Views/ScrollView/RCTScrollViewManager.m:38:20: warning: 'UIScrollViewContentInsetAdjustmentBehavior' is only available on iOS 11.0 or newer [-Wunguarded-availability-new]
```
Reviewed By: mattrobmattrob
Differential Revision: D14076127
fbshipit-source-id: 4050131c4f5211757383069567a2cf5382979735
Summary: Apparently, I haven't modify all files in D14018903. Here is the last (I hope) chunk.
Reviewed By: JoshuaGross
Differential Revision: D14058288
fbshipit-source-id: b21950cdd1aa9aa55b0c72fac0f8b44e4a7d131c
Summary:
Fixes#22824#21945 , the bug comes from #21208 , it was to fix#11897. Now Let's constrain edge adjust only when view has corners.
[iOS] [Fixed] - Fix triangle views on iOS
Pull Request resolved: https://github.com/facebook/react-native/pull/23402
Differential Revision: D14059192
Pulled By: hramos
fbshipit-source-id: be613bf056d3cc484f281f7ea3d08f251971700a
Summary:
Trivial.
If you have troubles with rebasing on top of this revision, run this on your diff:
$ find */*.h */*.mm */*.cpp */*.m -exec clang-format -style=file -i {} \;
Reviewed By: JoshuaGross
Differential Revision: D14018903
fbshipit-source-id: fd0ce2da0e11954e683385402738c701045e727c
Summary: I found that clang-format config file allows to specify rules on a per-language basis, so I moved Objective-C specific rules to the unified config. Now we have only one clang-format file. Yay!
Reviewed By: JoshuaGross
Differential Revision: D14018902
fbshipit-source-id: 45c1e185b8f2b8151ea202b3d9a68a3886597198
Summary:
There is no reason to allocate views ahead of time on the main thread.
There is a chance that this view will not be mounted and we are not saving any time because it's a sequential process anyway (because we are doing it on the main thread). Moreover, the switching context can only slowdown JS execution.
Reviewed By: JoshuaGross
Differential Revision: D14019433
fbshipit-source-id: 83ac05a91e4b70cb382a55d6687752480984404e
Summary:
A common util from RN to gate on testing code is `Platform.isTesting()`
Unfortunately, this util does not account for ServerSnapshotTests, since they don't use apple's XCTest infra.
Reviewed By: sahrens
Differential Revision: D13981728
fbshipit-source-id: bf902a04f5d7fcb98a06816f5c2c9b082e7d14b8
Summary: Recycling and dealloc were not implemented at all before for Slider, so I've taken a first stab at it. It's a little more complex than I initially thought, due to things I don't 100% understand about UISlider as well as Fabric, so I've left a TODO note to fix this at some point. We should be aware that view recycling doesn't appear to be working the way I would expect currently though.
Reviewed By: shergin
Differential Revision: D13965475
fbshipit-source-id: fd18a219cead770b63b514fdc868e23214e735b7
Summary: Don't use shared_ptr in this case, it's not needed.
Reviewed By: shergin
Differential Revision: D13965413
fbshipit-source-id: ec98c13f53c7d558a0cb68cea0f97568dd202cd8
Summary: The biggest change is that (1) the image proxy/observer code from the Image component has been generalized, (2) the four image props for the Slider component are fully supported, (3) a handful of props that were ignored or buggy on iOS now perform as expected.
Reviewed By: shergin
Differential Revision: D13954892
fbshipit-source-id: bec8ad3407c39a1cb186d9541a73b509dccc92ce
Summary:
TurboModules depend on a getConstants method. Existing ObjectiveC modules do not have this method. Therefore, I moved the contents of `constantsToExport` to `getConstants` and then had `constantsToExports` call `getConstants`.
facebook
Since all NativeModules will eventually need to be migrated to the TurboModule system, I didn't restrict this to just the NativeModules in Marketplace.
```
const fs = require('fs');
if (process.argv.length < 3) {
throw new Error('Expected a file containing a list of native modules as the third param');
}
function read(filename) {
return fs.readFileSync(filename, 'utf8');
}
const nativeModuleFilenames = read(process.argv[2]).split('\n').filter(Boolean);
nativeModuleFilenames.forEach((fileName) => {
if (fileName.endsWith('.h')) {
return;
}
const absPath = `${process.env.HOME}/${fileName}`;
const fileSource = read(absPath);
if (/(\n|^)-\s*\((.+)\)getConstants/.test(fileSource)) {
return;
}
const constantsToExportRegex = /(\n|^)-\s*\((.+)\)constantsToExport/;
const result = constantsToExportRegex.exec(fileSource);
if (result == null) {
throw new Error(`Didn't find a constantsToExport function inside NativeModule ${fileName}`);
}
const returnType = result[2];
const newFileSource = fileSource.replace(
constantsToExportRegex,
'$1- ($2)constantsToExport\n' +
'{\n' +
` return ${returnType.includes('ModuleConstants') ? '($2)' : ''}[self getConstants];\n` +
'}\n' +
'\n' +
'- ($2)getConstants'
);
fs.writeFileSync(absPath, newFileSource);
});
```
```
> xbgs -l ')constantsToExport'
```
Reviewed By: fkgozali
Differential Revision: D13951197
fbshipit-source-id: 394a319d42aff466c56a3d748e17c335307a8f47
Summary:
This diff adds performance loggers for Fabric in Android to be able to compare current version or RN with Fabric
This is the summary of Points and Annotations:
- **UIManager_CommitStart**: time that React starts the commit (react tree is ready to start rendering in native)
- **UIManager_LayoutTime**: this is the time it takes to calculate layout in yoga
- **UIManager_FabricFinishTransactionTime**: Time it takes transform "C++ mutationInstructions" into "Java MountItems" and cross boundaries from C++ to Java (including serialization of data) (THIS IS ONLY FABRIC)
- **UIManager_DispatchViewUpdates**: time right before RN moves the mount operations to the Queue that is going to be processed in the next tick UI thread
- **UIManager_BatchRunStart**: time right before the mountItems are going to be process in the UI Thread
- **UIManager_BatchedExecutionTime**: time it took to run batched mountItems (usually layout and prop updates on views)
- **UIManager_NonBatchedExecutionTime**: time it took to run non-batched mountItems (usually creation of views)
Reviewed By: fkgozali
Differential Revision: D13838337
fbshipit-source-id: 0a707619829e7d95ce94d9305ff434d1224afc46
Summary:
When using building React Native using the `.xcodeproj` (either via linked projects in Xcode, or precompiling React Native, which is what we do), you'll get a duplicate symbol error:
```
duplicate symbol __ZN8facebook5react10IInspectorD0Ev ...
```
And a few more.
This is because the `InspectorInterfaces.cpp` file is included in _both_ the `React` target _and_ the `jsinspector` target, and since the `jsinspector` target gets linked into the `React` target, this means the symbols from `InspectorInterfaces.cpp` end up in `libReact.a` twice.
<img width="187" alt="screen shot 2019-02-04 at 11 43 39 am" src="https://user-images.githubusercontent.com/819705/52189088-93190880-288a-11e9-8411-b44b59e8e461.png">
This PR removes `InspectorInterfaces.cpp` from the `React` target, as I believe was the original intent.
Since this bug is in the `xcodeproj` it only affects builds that use that, so CocoaPods and Buck users are unaffected.
[iOS][Fixed] - Fix potential linker issues when using xcode project
Pull Request resolved: https://github.com/facebook/react-native/pull/23284
Differential Revision: D13941777
Pulled By: cpojer
fbshipit-source-id: 8a3ffb4fc916ff6570bbff8794b4515b48055667
Summary:
Given two apps loaded side-by-side and when a `Keyboard` event is triggered, there is no way to ascertain which app triggered the keyboard event. This ambiguity can arise in slide over/split view scenarios.
This pull request exposes the `isLocalUserInfoKey` property of the native `UIKeyboard` iOS events to the `Keyboard` event listener; this property will return `true` for the app that triggered the keyboard event.
(Also, I threw in a couple of Keyboard.js tests just for fun 😅)
[iOS][Added] - Expose isLocalUserInfoKey to keyboard event notifications
1. Load two apps side-by-side, with the app on the left side subscribing to the keyboard events (and logging out the events as they happen)
1. Trigger a keyboard to appear with the left app. The logged keyboard event will contain the `isEventFromThisApp` property which will be true.
1. Dismiss the keyboard
1. Trigger a keyboard to appear with the right app. The left app will still log the keyboard event, but the event's `isEventFromThisApp` property will be false (because the left app didn't trigger the keyboard event)
Pull Request resolved: https://github.com/facebook/react-native/pull/23245
Differential Revision: D13928612
Pulled By: hramos
fbshipit-source-id: 6d74d2565e2af62328485fd9da86f15f9e2ccfab
Summary:
Fixes#23076 , the reason is `blur()` is managed by `UIManager`, `UIManager` maintains all operations and execute them each `batchDidComplete`, which means every time `JS` finish callback native , but `Alert` module would call directly, this mess up the order of method call, for example like below, even `this.$input.blur()` is called before `Alert.alert()`, but in native side, `Alert.alert()` is called before `this.$input.blur()`.
```
<TextInput style={{ borderWidth: 1 }} ref={$input => this.$input = $input} />
<Button title="Show Alert" onPress={() => {
// // `blur` works if using without `Alert`
this.$input && this.$input.blur()
// // `blur` is not working
Alert.alert('show alert', 'desc', [
{ text: 'cancel', style: 'cancel' },
{ text: 'show', onPress: () => {
}},
])
}} />
```
[iOS] [Fixed] - Fixes alert view block first responder
After fix, example like below, `blur` can works.
```
import * as React from 'react';
import { TextInput, View, Alert, Button } from 'react-native';
export default class App extends React.Component {
render() {
return (
<View style={{ flex: 1, justifyContent: 'center' }}>
<TextInput style={{ borderWidth: 1 }} ref={$input => this.$input = $input} />
<Button title="Show Alert" onPress={() => {
this.$input && this.$input.blur()
Alert.alert('show alert', 'desc', [
{ text: 'cancel', style: 'cancel' },
{ text: 'show', onPress: () => {
}},
])
}} />
</View>
);
}
}
```
Pull Request resolved: https://github.com/facebook/react-native/pull/23240
Differential Revision: D13915920
Pulled By: cpojer
fbshipit-source-id: fe1916fcb5913e2b8128d045a6364c5e3d39c516
Summary:
NativeModules are instantiated by the bridge. If they choose, they can capture the bridge instance that instantiated them. From within the NativeModule, the bridge can then be used to lookup other NativeModules. TurboModules have no way to do such a lookup.
Both NativeModules and TurboModules need to be able to query for one another. Therefore, we have four cases:
1. NativeModule accesses NativeModule.
2. NativeModule accesses TurboModule.
3. TurboModule accesses NativeModule.
4. TurboModule accesses TurboModule.
In summary, this solution extends the bridge to support querying TurboModules. It also introduces a `RCTTurboModuleLookupDelegate` protocol, which, implemented by `RCTTurboModuleManager`, supports querying TurboModules:
```
protocol RCTTurboModuleLookupDelegate <NSObject>
- (id)moduleForName:(NSString *)moduleName;
- (id)moduleForName:(NSString *)moduleName warnOnLookupFailure:(BOOL)warnOnLookupFailure;
- (BOOL)moduleIsInitialized:(NSString *)moduleName
end
```
If TurboModules want to query other TurboModules, then they need to implement this protocol and synthesize `turboModuleLookupDelegate`:
```
protocol RCTTurboModuleWithLookupCapabilities
property (nonatomic, weak) id<RCTTurboModuleLookupDelegate> turboModuleLookupDelegate;
end
```
NativeModules will continue to use `RCTBridge` to access other NativeModules. Nothing needs to change.
When we attach the bridge to `RCTTurboModuleManager`, we also attach `RCTTurboModuleManager` to the bridge as a `RCTTurboModuleLookupDelegate`. This allows the bridge to query TurboModules, which enables our NativeModules to transparently (i.e: without any NativeModule code modification) query TurboModules.
In an ideal world, all modules would be TurboModules. Until then, we're going to require that TurboModules use the bridge to query for NativeModules or TurboModules.
`RCTTurboModuleManager` keeps a map of all TurboModules that we instantiated. We simply search in this map and return the TurboModule.
This setup allows us to switch NativeModules to TurboModules without compromising their ability to use the bridge to search for other NativeModules (and TurboModules). When we write new TurboModules, we can have them use `RCTTurboModuleLookupDelegate` to do access other TurboModules. Eventually, after we migrate all NativeModules to TurboModules, we can migrate all old callsites to use `RCTTurboModuleLookupDelegate`.
Reviewed By: fkgozali
Differential Revision: D13553186
fbshipit-source-id: 4d0488eef081332c8b70782e1337eccf10717dae
Summary:
For better modularity, each module conforming to RCTTurboModule should provide a getter for the specific TurboModule instance for itself. This is a bit more extra work for devs, but simplify tooling and allow better modularity vs having a central function that provides the correct instance based on name.
Note: Android may or may not follow this new pattern -- TBD.
Reviewed By: RSNara
Differential Revision: D13882073
fbshipit-source-id: 6d5f82af67278c39c43c4f7970995690d4a82a98
Summary:
@public
Adds a class for triggering markers.
This calls `startMarker()` on construction, and `endMarker()` on destruction, thus being usable like a "scope guard": the object is instantiated, and automatically destroyed when going out of scope.
Reviewed By: SidharthGuglani
Differential Revision: D13817589
fbshipit-source-id: fd88884af970c1c0933d9ca6843f3f8f5d28b9e6
Summary:
RCTAsyncLocalStorage did not write the manifest after removing a value that was larger than RCTInlineValueThreshold. This meant that the values would still be on disk as null in the manifest.json, and if the app didn't do anything to make the manifest get written out again the null values would persist in the AsyncStorage and be returned by getAllKeys. We need to always write out the manifest.json even if the value is in the overflow storage files.
Thank you for sending the PR! We appreciate you spending the time to work on these changes.
Help us understand your motivation by explaining why you decided to make this change.
Fixes#9196.
Not sure where the tests are for this?
none.
[IOS] [BUGFIX] [AsyncStorage] - Correctly remove keys of large values from AsyncStorage.
tadeuzagallo nicklockwood dannycochran
Pull Request resolved: https://github.com/facebook/react-native/pull/18613
Differential Revision: D13860820
Pulled By: cpojer
fbshipit-source-id: ced1cd40273140335cd9b1f29fc1c1881ab8cebd
Summary:
Currently, if an app uses AsyncStorage on the JS side, there is no public interface to access stored data from the native side.
In our app, written in Swift, I have written a [helper](https://gist.github.com/ejmartin504/d501abe55c28450a0e52ac39aee7b0e6) that pulls out the data. I accomplished this by reverse-engineering the code in RCTAsyncLocalStorage.m. It would have been far easier had this code been exposed to native.
I made this change locally and tested out getting the data from Swift code. This worked like a charm:
```swift
let storage = RCTAsyncLocalStorage()
let cacheKey = "test"
storage.methodQueue?.async {
self.storage.multiGet([cacheKey]) { values in
print(values)
}
}
```
[IOS ][ENHANCEMENT ][RCTAsyncLocalStorage.h] - Expose AsyncLocalStorage get/set methods to native code.
<!--
**INTERNAL and MINOR tagged notes will not be included in the next version's final release notes.**
CATEGORY
[----------] TYPE
[ CLI ] [-------------] LOCATION
[ DOCS ] [ BREAKING ] [-------------]
[ GENERAL ] [ BUGFIX ] [ {Component} ]
[ INTERNAL ] [ ENHANCEMENT ] [ {Filename} ]
[ IOS ] [ FEATURE ] [ {Directory} ] |-----------|
[ ANDROID ] [ MINOR ] [ {Framework} ] - | {Message} |
[----------] [-------------] [-------------] |-----------|
EXAMPLES:
[IOS] [BREAKING] [FlatList] - Change a thing that breaks other things
[ANDROID] [BUGFIX] [TextInput] - Did a thing to TextInput
[CLI] [FEATURE] [local-cli/info/info.js] - CLI easier to do things with
[DOCS] [BUGFIX] [GettingStarted.md] - Accidentally a thing/word
[GENERAL] [ENHANCEMENT] [Yoga] - Added new yoga thing/position
[INTERNAL] [FEATURE] [./scripts] - Added thing to script that nobody will see
-->
Pull Request resolved: https://github.com/facebook/react-native/pull/18454
Differential Revision: D13860333
Pulled By: cpojer
fbshipit-source-id: b33ee5bf1ec65c8291bfcb76b0d6f0df39376a7e
Summary:
Motivation:
----------
This is one of the more sought after feature requests for RN:
react-native.canny.io/feature-requests/p/add-speed-attribute-to-scrollto
This PR adds the support to add a "duration" whenever using "scrollTo" or "scrollToEnd" with
a scrollView. Currently this only exists for Android as the iOS implementation will be somewhat more involved.
This PR is also backwards compatible and does not yet deprecate the "animated" boolean. It may not make sense to ever deprecate "animated", as it could be the flag that is used when devs want the system default duration (which is 250ms for Android). I'm not sure what it is for iOS. It would simplify things to remove "animated", though.
Pull Request resolved: https://github.com/facebook/react-native/pull/22884
Differential Revision: D13860038
Pulled By: cpojer
fbshipit-source-id: f06751d063a33d7046241c95348b6abbb327d36f
Summary:
@public
Adds a function to allow to configure markers. The function is declared in `YGMarker.h`
Reviewed By: SidharthGuglani
Differential Revision: D13819111
fbshipit-source-id: f9158b3d4e5727da4e151c84b523c7c7e8158620
Summary: Small changes to get Profile build working. Compiler errors or immediate crashes occur without these lines, when running a profile build on device.
Reviewed By: fkgozali
Differential Revision: D13823136
fbshipit-source-id: a1777d5337d8bd78ef3eb11bbeeb7e23c383ab83
Summary: Folly promises/futures have been replaced by an observer model which keeps track of loading state. This resolves at least one crash that I can no longer repro and simplifies the code a bit (IMO).
Reviewed By: shergin
Differential Revision: D13743393
fbshipit-source-id: 2b650841525db98b2f67add85f2097f24259c6cf
Summary: Objective-C side of the Fabric-compatible slider component for iOS.
Reviewed By: mdvacca
Differential Revision: D13745263
fbshipit-source-id: 647631d6fc86f81a5d4f735c507636ed9c468093
Summary:
…it doesn't exist (#21593)
Fixes#21593
RCTTVView.m contains a method called `setHasTVPreferredFocus`, where the following function call breaks the build:
[(RCTRootView *)rootview setReactPreferredFocusedView:self];
`setReactPreferredFocusedView` was formerly part of **RCTRootViewInternal.h** but was removed sometime.
Pull Request resolved: https://github.com/facebook/react-native/pull/21596
Differential Revision: D13761925
Pulled By: cpojer
fbshipit-source-id: be536786d7a8209f3a97b039e17d68d0aa653a0d
Summary:
Applies the `thumbTintColor` prop to Sliders on iOS (which has been supported since iOS 5.0). Updates other documentation so that it is not labeled as Android-only, including the RNTester app
Pull Request resolved: https://github.com/facebook/react-native/pull/22177
Differential Revision: D13695554
Pulled By: hramos
fbshipit-source-id: 250f6574b193a37b3cd237bcf42612c3e91bf813
Summary: This diff open sources Fabric Android implementation and it extracts ComponentDescriptorFactory into a function that can be "injected" per application
Reviewed By: shergin
Differential Revision: D13616172
fbshipit-source-id: 7b7a6461216740b5a1ad5ebbead9e37de4570221
Summary: I need this to set up QPL hooks in Instagram on iOS (see D13668326).
Reviewed By: mhorowitz
Differential Revision: D13668327
fbshipit-source-id: ee17d29ec0bbf4ef74736b1d7a095f955c0a7cc1
Summary:
Xcode 9 has compiler settings that are more strict. This can occur if someone updates there project to use the default settings.
This patch declares the default type instead of allowing the compiler to determine it. Instead of () we now say (void) in a block call.
Motivation
It was just trying to get my project totally empty of warnings, and it has no side effects. If there are side effects, then we should fix the type and not go with empty to represent void.
Test Plan
Update project settings in Xcode. This code doesn't have any known side effects since the compiler assumes the type is void when not declared.
Release Notes
[DOCS] - Fixed potential compiler build issue on Xcode 9 after updating settings in project.
Pull Request resolved: https://github.com/facebook/react-native/pull/17872
Differential Revision: D6981435
Pulled By: hramos
fbshipit-source-id: 508ecea0f8874dc16a25f1dee6255481b309f8c2
Summary: We are now generating the native cpp files for Switch via Buck. Deleting the hand written files and switching over.
Reviewed By: JoshuaGross, mdvacca
Differential Revision: D13666672
fbshipit-source-id: 72cf6f6af9374511f2742f8f0d996fa52e1bff5b
