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Allow RCTBundleURLProvider to request an inline source map (#37878)
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Summary:
See: http://blog.nparashuram.com/2019/10/debugging-react-native-ios-apps-with.html
When using direct debugging with JavaScriptCore, Safari Web Inspector doesn't pick up the source map over the network. Instead, as far as I can tell, it expects you to pass the source URL at the time you load your bundle:  https://developer.apple.com/documentation/javascriptcore/jscontext/1451384-evaluatescript?language=objc . This leads to a very sub-par developer experience debugging the JSbundle directly. It will however, pick up an inline source map. Therefore, let's add a way to have React Native tell metro to request an inline source map.

I did this by modifying `RCTBundleURLProvider` to have a new query parameter for `inlineSourceMap`, and set to true by default for JSC.

## Changelog:

[IOS] [ADDED] - Added support to inline the source map via RCTBundleURLProvider

Pull Request resolved: #37878

Test Plan:
I can put a breakpoint in RNTester, via Safari Web Inspector, in human readable code :D

<img width="1728" alt="Screenshot 2023-06-14 at 4 09 03 AM" src="https://github.com/facebook/react-native/assets/6722175/055277fa-d887-4566-9dc6-3ea07a1a60b0">

Reviewed By: motiz88

Differential Revision: D46855418

Pulled By: huntie

fbshipit-source-id: 2134cdbcd0a3e81052d26ed75f83601ae4ddecfe
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@Saadnajmi @facebook-github-bot
Saadnajmi authored and facebook-github-bot committed Jun 27, 2023
1 parent 3be3731 commit f7219ec
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Showing 3 changed files with 111 additions and 14 deletions.
35 changes: 33 additions & 2 deletions packages/react-native/React/Base/RCTBundleURLProvider.h
View file
Expand Up @@ -101,6 +101,7 @@ RCT_EXTERN void RCTBundleURLProviderAllowPackagerServerAccess(BOOL allowed);

@property (nonatomic, assign) BOOL enableMinification;
@property (nonatomic, assign) BOOL enableDev;
@property (nonatomic, assign) BOOL inlineSourceMap;

/**
* The scheme/protocol used of the packager, the default is the http protocol
Expand All @@ -125,13 +126,32 @@ RCT_EXTERN void RCTBundleURLProviderAllowPackagerServerAccess(BOOL allowed);
+ (NSURL *)jsBundleURLForBundleRoot:(NSString *)bundleRoot
packagerHost:(NSString *)packagerHost
enableDev:(BOOL)enableDev
enableMinification:(BOOL)enableMinification;
enableMinification:(BOOL)enableMinification
__deprecated_msg(
"Use `jsBundleURLForBundleRoot:packagerHost:enableDev:enableMinification:inlineSourceMap:` instead");

+ (NSURL *)jsBundleURLForBundleRoot:(NSString *)bundleRoot
packagerHost:(NSString *)packagerHost
packagerScheme:(NSString *)scheme
enableDev:(BOOL)enableDev
enableMinification:(BOOL)enableMinification
modulesOnly:(BOOL)modulesOnly
runModule:(BOOL)runModule
__deprecated_msg(
"Use jsBundleURLForBundleRoot:packagerHost:enableDev:enableMinification:inlineSourceMap:modulesOnly:runModule:` instead");

+ (NSURL *)jsBundleURLForBundleRoot:(NSString *)bundleRoot
packagerHost:(NSString *)packagerHost
enableDev:(BOOL)enableDev
enableMinification:(BOOL)enableMinification
inlineSourceMap:(BOOL)inlineSourceMap;

+ (NSURL *)jsBundleURLForBundleRoot:(NSString *)bundleRoot
packagerHost:(NSString *)packagerHost
packagerScheme:(NSString *)scheme
enableDev:(BOOL)enableDev
enableMinification:(BOOL)enableMinification
inlineSourceMap:(BOOL)inlineSourceMap
modulesOnly:(BOOL)modulesOnly
runModule:(BOOL)runModule;
/**
Expand All @@ -142,6 +162,17 @@ RCT_EXTERN void RCTBundleURLProviderAllowPackagerServerAccess(BOOL allowed);
+ (NSURL *)resourceURLForResourcePath:(NSString *)path
packagerHost:(NSString *)packagerHost
scheme:(NSString *)scheme
query:(NSString *)query;
query:(NSString *)query
__deprecated_msg("Use version with queryItems parameter instead");

/**
* Given a hostname for the packager and a resource path (including "/"), return the URL to the resource.
* In general, please use the instance method to decide if the packager is running and fallback to the pre-packaged
* resource if it is not: -resourceURLForResourceRoot:resourceName:resourceExtension:offlineBundle:
*/
+ (NSURL *)resourceURLForResourcePath:(NSString *)path
packagerHost:(NSString *)packagerHost
scheme:(NSString *)scheme
queryItems:(NSArray<NSURLQueryItem *> *)queryItems;

@end
86 changes: 76 additions & 10 deletions packages/react-native/React/Base/RCTBundleURLProvider.mm
View file
Expand Up @@ -22,10 +22,12 @@ void RCTBundleURLProviderAllowPackagerServerAccess(BOOL allowed)
kRCTAllowPackagerAccess = allowed;
}
#endif
static NSString *const kRCTPlatformName = @"ios";
static NSString *const kRCTPackagerSchemeKey = @"RCT_packager_scheme";
static NSString *const kRCTJsLocationKey = @"RCT_jsLocation";
static NSString *const kRCTEnableDevKey = @"RCT_enableDev";
static NSString *const kRCTEnableMinificationKey = @"RCT_enableMinification";
static NSString *const kRCTInlineSourceMapKey = @"RCT_inlineSourceMap";

@implementation RCTBundleURLProvider

Expand Down Expand Up @@ -187,6 +189,7 @@ - (NSURL *)jsBundleURLForBundleRoot:(NSString *)bundleRoot fallbackURLProvider:(
packagerScheme:[self packagerScheme]
enableDev:[self enableDev]
enableMinification:[self enableMinification]
inlineSourceMap:[self inlineSourceMap]
modulesOnly:NO
runModule:YES];
}
Expand All @@ -199,6 +202,7 @@ - (NSURL *)jsBundleURLForSplitBundleRoot:(NSString *)bundleRoot
packagerScheme:[self packagerScheme]
enableDev:[self enableDev]
enableMinification:[self enableMinification]
inlineSourceMap:[self inlineSourceMap]
modulesOnly:YES
runModule:NO];
}
Expand Down Expand Up @@ -238,20 +242,37 @@ - (NSURL *)resourceURLForResourceRoot:(NSString *)root
return [[self class] resourceURLForResourcePath:path
packagerHost:packagerServerHostPort
scheme:packagerServerScheme
query:nil];
queryItems:nil];
}

+ (NSURL *)jsBundleURLForBundleRoot:(NSString *)bundleRoot
packagerHost:(NSString *)packagerHost
enableDev:(BOOL)enableDev
enableMinification:(BOOL)enableMinification
{
return [self jsBundleURLForBundleRoot:bundleRoot
packagerHost:packagerHost
packagerScheme:nil
enableDev:enableDev
enableMinification:enableMinification
inlineSourceMap:NO
modulesOnly:NO
runModule:YES];
}

+ (NSURL *)jsBundleURLForBundleRoot:(NSString *)bundleRoot
packagerHost:(NSString *)packagerHost
enableDev:(BOOL)enableDev
enableMinification:(BOOL)enableMinification
inlineSourceMap:(BOOL)inlineSourceMap

{
return [self jsBundleURLForBundleRoot:bundleRoot
packagerHost:packagerHost
packagerScheme:nil
enableDev:enableDev
enableMinification:enableMinification
inlineSourceMap:inlineSourceMap
modulesOnly:NO
runModule:YES];
}
Expand All @@ -263,22 +284,43 @@ + (NSURL *)jsBundleURLForBundleRoot:(NSString *)bundleRoot
enableMinification:(BOOL)enableMinification
modulesOnly:(BOOL)modulesOnly
runModule:(BOOL)runModule
{
return [self jsBundleURLForBundleRoot:bundleRoot
packagerHost:packagerHost
packagerScheme:nil
enableDev:enableDev
enableMinification:enableMinification
inlineSourceMap:NO
modulesOnly:modulesOnly
runModule:runModule];
}

+ (NSURL *)jsBundleURLForBundleRoot:(NSString *)bundleRoot
packagerHost:(NSString *)packagerHost
packagerScheme:(NSString *)scheme
enableDev:(BOOL)enableDev
enableMinification:(BOOL)enableMinification
inlineSourceMap:(BOOL)inlineSourceMap
modulesOnly:(BOOL)modulesOnly
runModule:(BOOL)runModule
{
NSString *path = [NSString stringWithFormat:@"/%@.bundle", bundleRoot];
BOOL lazy = enableDev;
// When we support only iOS 8 and above, use queryItems for a better API.
NSString *query = [NSString stringWithFormat:@"platform=ios&dev=%@&lazy=%@&minify=%@&modulesOnly=%@&runModule=%@",
enableDev ? @"true" : @"false",
lazy ? @"true" : @"false",
enableMinification ? @"true" : @"false",
modulesOnly ? @"true" : @"false",
runModule ? @"true" : @"false"];
NSArray<NSURLQueryItem *> *queryItems = @[
[[NSURLQueryItem alloc] initWithName:@"platform" value:kRCTPlatformName],
[[NSURLQueryItem alloc] initWithName:@"dev" value:enableDev ? @"true" : @"false"],
[[NSURLQueryItem alloc] initWithName:@"lazy" value:lazy ? @"true" : @"false"],
[[NSURLQueryItem alloc] initWithName:@"minify" value:enableMinification ? @"true" : @"false"],
[[NSURLQueryItem alloc] initWithName:@"inlineSourceMap" value:inlineSourceMap ? @"true" : @"false"],
[[NSURLQueryItem alloc] initWithName:@"modulesOnly" value:modulesOnly ? @"true" : @"false"],
[[NSURLQueryItem alloc] initWithName:@"runModule" value:runModule ? @"true" : @"false"],
];

NSString *bundleID = [[NSBundle mainBundle] objectForInfoDictionaryKey:(NSString *)kCFBundleIdentifierKey];
if (bundleID) {
query = [NSString stringWithFormat:@"%@&app=%@", query, bundleID];
queryItems = [queryItems arrayByAddingObject:[[NSURLQueryItem alloc] initWithName:@"app" value:bundleID]];
}
return [[self class] resourceURLForResourcePath:path packagerHost:packagerHost scheme:scheme query:query];
return [[self class] resourceURLForResourcePath:path packagerHost:packagerHost scheme:scheme queryItems:queryItems];
}

+ (NSURL *)resourceURLForResourcePath:(NSString *)path
Expand All @@ -295,6 +337,20 @@ + (NSURL *)resourceURLForResourcePath:(NSString *)path
return components.URL;
}

+ (NSURL *)resourceURLForResourcePath:(NSString *)path
packagerHost:(NSString *)packagerHost
scheme:(NSString *)scheme
queryItems:(NSArray<NSURLQueryItem *> *)queryItems
{
NSURLComponents *components = [NSURLComponents componentsWithURL:serverRootWithHostPort(packagerHost, scheme)
resolvingAgainstBaseURL:NO];
components.path = path;
if (queryItems != nil) {
components.queryItems = queryItems;
}
return components.URL;
}

- (void)updateValue:(id)object forKey:(NSString *)key
{
[[NSUserDefaults standardUserDefaults] setObject:object forKey:key];
Expand All @@ -312,6 +368,11 @@ - (BOOL)enableMinification
return [[NSUserDefaults standardUserDefaults] boolForKey:kRCTEnableMinificationKey];
}

- (BOOL)inlineSourceMap
{
return [[NSUserDefaults standardUserDefaults] boolForKey:kRCTInlineSourceMapKey];
}

- (NSString *)jsLocation
{
return [[NSUserDefaults standardUserDefaults] stringForKey:kRCTJsLocationKey];
Expand Down Expand Up @@ -341,6 +402,11 @@ - (void)setEnableMinification:(BOOL)enableMinification
[self updateValue:@(enableMinification) forKey:kRCTEnableMinificationKey];
}

- (void)setInlineSourceMap:(BOOL)inlineSourceMap
{
[self updateValue:@(inlineSourceMap) forKey:kRCTInlineSourceMapKey];
}

- (void)setPackagerScheme:(NSString *)packagerScheme
{
[self updateValue:packagerScheme forKey:kRCTPackagerSchemeKey];
Expand Down
4 changes: 2 additions & 2 deletions packages/rn-tester/RNTesterUnitTests/RCTBundleURLProviderTests.m
View file
Expand Up @@ -26,7 +26,7 @@
URLWithString:
[NSString
stringWithFormat:
@"http://localhost:8081/%@.bundle?platform=ios&dev=true&lazy=true&minify=false&modulesOnly=false&runModule=true&app=com.apple.dt.xctest.tool",
@"http://localhost:8081/%@.bundle?platform=ios&dev=true&lazy=true&minify=false&inlineSourceMap=false&modulesOnly=false&runModule=true&app=com.apple.dt.xctest.tool",
testFile]];
}

Expand All @@ -36,7 +36,7 @@
URLWithString:
[NSString
stringWithFormat:
@"http://192.168.1.1:8081/%@.bundle?platform=ios&dev=true&lazy=true&minify=false&modulesOnly=false&runModule=true&app=com.apple.dt.xctest.tool",
@"http://192.168.1.1:8081/%@.bundle?platform=ios&dev=true&lazy=true&minify=false&inlineSourceMap=false&modulesOnly=false&runModule=true&app=com.apple.dt.xctest.tool",
testFile]];
}

Expand Down

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