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[Bug]: ShapeSource.getClusterLeaves crash on iOS (NOBRIDGE mode)
Mapbox Implementation
Mapbox
Mapbox Version
11.3.0
React Native Version
0.75.2
Platform
iOS
@rnmapbox/maps version
10.1.31
Standalone component to reproduce
import React, {useRef} from 'react';
import {Button} from 'react-native';
import {
Images,
MapView,
ShapeSource,
SymbolLayer,
CircleLayer,
Camera,
} from '@rnmapbox/maps';
const styles = {
mapView: {width: '100%', height: 500},
cluster: {
circleRadiusTransition: {duration: 5000, delay: 0},
circleColor: '#ff0000',
},
};
const features = {
type: 'FeatureCollection',
features: [
{
type: 'Feature',
id: 'a-feature',
properties: {
icon: 'example',
},
geometry: {
type: 'Point',
coordinates: [-74.00597, 40.71427],
},
},
{
type: 'Feature',
id: 'b-feature',
properties: {
icon: 'example',
},
geometry: {
type: 'Point',
coordinates: [-74.001097, 40.71527],
},
},
{
type: 'Feature',
id: 'c-feature',
properties: {
icon: 'example',
},
geometry: {
type: 'Point',
coordinates: [-74.00697, 40.72427],
},
},
],
};
const BugReportExample = () => {
const mapView = useRef<MapView>(null);
const shapeSourceMarkers = useRef<ShapeSource>(null);
const getVisibleMarkers = async () => {
let visibleMarkers: any[] = [];
const arrFeatures = await mapView.current?.queryRenderedFeaturesInRect(
[],
[],
['marker', 'cluster'],
);
if (!arrFeatures) {
return visibleMarkers;
}
for (let index = 0; index < arrFeatures.features.length; index++) {
const feature = arrFeatures.features[index];
const properties = feature.properties;
if (!properties) {
continue;
}
if (properties.cluster) {
try {
// ====> THE FOLLOWING LINE CRASHES THE WHOLE APP <====
const collection = await shapeSourceMarkers.current?.getClusterLeaves(
feature,
properties.point_count,
0,
);
collection.features.forEach((f: any) => {
visibleMarkers.push(f);
});
} catch (error: any) {
console.debug('error', error);
}
} else {
visibleMarkers.push(feature);
}
}
console.debug('visibleMarkers', visibleMarkers);
return visibleMarkers;
};
const circleLayerStyle = {
...styles.cluster,
...{circleRadius: 15},
};
return (
<>
<MapView style={styles.mapView} ref={mapView}>
<Camera
defaultSettings={{
centerCoordinate: [-74.001097, 40.71527],
zoomLevel: 10,
}}
/>
<Images images={{example: {uri: 'https://27crags-sandbox.s3.amazonaws.com/v6-icon.png'}}} />
<ShapeSource
id={'shape-source-markers'}
ref={shapeSourceMarkers}
shape={features}
cluster={true}
clusterRadius={30}
clusterMaxZoomLevel={19}>
<SymbolLayer
id="marker"
style={{
iconImage: ['get', 'icon'],
iconAllowOverlap: false,
iconSize: 0.5,
}}
slot={'middle'}
filter={['!', ['has', 'point_count']]}
/>
<SymbolLayer
id="pointCount"
style={{
textField: ['format', ['concat', ['get', 'point_count']]],
textSize: 12,
textPitchAlignment: 'viewport',
textAllowOverlap: false,
}}
/>
<CircleLayer
id={'cluster'}
belowLayerID="pointCount"
style={circleLayerStyle}
slot={'bottom'}
filter={['has', 'point_count']}
/>
</ShapeSource>
</MapView>
<Button
title="Count all items inside clusters"
onPress={() => {
getVisibleMarkers().then(visibleMarkers => {
console.debug('visibleMarkers', visibleMarkers);
});
}}
/>
</>
);
};
export default BugReportExample;
Observed behavior and steps to reproduce
When trying to get clusterLeaves using the method getClusterLeaves() of ShapeSource the app crashes immediately.
0 libobjc.A.dylib 0x18005d44c objc_retain + 8
1 libobjc.A.dylib 0x1800856c0 objc_storeStrong + 44
2 RNLatest 0x101870b78 -[RNMBXShapeSourceModule getClusterLeaves:featureJSON:number:offset:resolve:reject:] + 120 (RNMBXShapeSourceModule.mm:56)
3 CoreFoundation 0x1804b4720 __invoking___ + 144
4 CoreFoundation 0x1804b1a84 -[NSInvocation invoke] + 276
5 CoreFoundation 0x1804b1d1c -[NSInvocation invokeWithTarget:] + 60
6 RNLatest 0x1012bc5c8 invocation function for block in facebook::react::ObjCTurboModule::performMethodInvocation(facebook::jsi::Runtime&, bool, char const*, NSInvocation*, NSMutableArray*) + 240 (RCTTurboModule.mm:347)
7 RNLatest 0x1012d2d90 facebook::react::ObjCTurboModule::performMethodInvocation(facebook::jsi::Runtime&, bool, char const*, NSInvocation*, NSMutableArray*)::$_2::operator()() const + 96 (RCTTurboModule.mm:380)
8 RNLatest 0x1012d2d24 decltype(std::declval<facebook::react::ObjCTurboModule::performMethodInvocation(facebook::jsi::Runtime&, bool, char const*, NSInvocation*, NSMutableArray*)::$_2&>()()) std::__1::__invoke[abi:ue170006]<facebook::react::ObjCTurboModule::performMethodInvocation(facebook::jsi::Runtime&, bool, char const*, NSInvocation*, NSMutableArray*)::$_2&>(facebook::react::ObjCTurboModule::performMethodInvocation(facebook::jsi::Runtime&, bool, char const*, NSInvocation*, NSMutableArray*)::$_2&) + 24 (invoke.h:340)
9 RNLatest 0x1012d2cdc void std::__1::__invoke_void_return_wrapper<void, true>::__call[abi:ue170006]<facebook::react::ObjCTurboModule::performMethodInvocation(facebook::jsi::Runtime&, bool, char const*, NSInvocation*, NSMutableArray*)::$_2&>(facebook::react::ObjCTurboModule::performMethodInvocation(facebook::jsi::Runtime&, bool, char const*, NSInvocation*, NSMutableArray*)::$_2&) + 24 (invoke.h:415)
10 RNLatest 0x1012d2cb8 std::__1::__function::__alloc_func<facebook::react::ObjCTurboModule::performMethodInvocation(facebook::jsi::Runtime&, bool, char const*, NSInvocation*, NSMutableArray*)::$_2, std::__1::allocator<facebook::react::ObjCTurboModule::performMethodInvocation(facebook::jsi::Runtime&, bool, char const*, NSInvocation*, NSMutableArray*)::$_2>, void ()>::operator()[abi:ue170006]() + 28 (function.h:193)
11 RNLatest 0x1012d1a1c std::__1::__function::__func<facebook::react::ObjCTurboModule::performMethodInvocation(facebook::jsi::Runtime&, bool, char const*, NSInvocation*, NSMutableArray*)::$_2, std::__1::allocator<facebook::react::ObjCTurboModule::performMethodInvocation(facebook::jsi::Runtime&, bool, char const*, NSInvocation*, NSMutableArray*)::$_2>, void ()>::operator()() + 28 (function.h:364)
12 RNLatest 0x100e7b534 std::__1::__function::__value_func<void ()>::operator()[abi:ue170006]() const + 68 (function.h:518)
13 RNLatest 0x100e7b454 std::__1::function<void ()>::operator()() const + 24 (function.h:1169)
14 RNLatest 0x1012e25e4 invocation function for block in (anonymous namespace)::ModuleNativeMethodCallInvoker::invokeAsync(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>> const&, std::__1::function<void ()>&&) + 44 (RCTTurboModuleManager.mm:129)
15 libdispatch.dylib 0x180170104 _dispatch_call_block_and_release + 24
16 libdispatch.dylib 0x180171978 _dispatch_client_callout + 16
17 libdispatch.dylib 0x180179b10 _dispatch_lane_serial_drain + 960
18 libdispatch.dylib 0x18017a688 _dispatch_lane_invoke + 388
19 libdispatch.dylib 0x180185a84 _dispatch_root_queue_drain_deferred_wlh + 276
20 libdispatch.dylib 0x1801850d0 _dispatch_workloop_worker_thread + 448
21 libsystem_pthread.dylib 0x1042cb814 _pthread_wqthread + 284
22 libsystem_pthread.dylib 0x1042ca5d4 start_wqthread + 8
Expected behavior
ShapeSource.getClusterLeaves() used to worked on old architecture.
Notes / preliminary analysis
No response
Additional links and references
https://github.com/user-attachments/assets/5a8f6a69-0eea-4e19-a3e4-eb01c5ced27b
This is happening to me as well.
https://github.com/user-attachments/assets/3b59ec62-a823-4c1e-8af5-c4349c14bf82
Here is the relevant crash report :
Thread 24 name:
Thread 24 Crashed:
0 libobjc.A.dylib 0x000000018382605c objc_retain + 8 (:-1)
1 MhMap 0x0000000102aab504 -[RNMBXShapeSourceModule getClusterLeaves:featureJSON:number:offset:resolve:reject:] + 72 (RNMBXShapeSourceModule.mm:56)
2 CoreFoundation 0x000000018b92d814 __invoking___ + 148 (:-1)
3 CoreFoundation 0x000000018b92c860 -[NSInvocation invoke] + 428 (NSForwarding.m:3411)
4 CoreFoundation 0x000000018b9a31dc -[NSInvocation invokeWithTarget:] + 64 (NSForwarding.m:3508)
5 MhMap 0x0000000102895254 invocation function for block in facebook::react::ObjCTurboModule::performMethodInvocation(facebook::jsi::Runtime&, bool, char const*, NSInvocation*, NSMutableArray*) + 120 (RCTTurboModule.mm:347)
6 MhMap 0x000000010289a978 facebook::react::ObjCTurboModule::performMethodInvocation(facebook::jsi::Runtime&, bool, char const*, NSInvocation*, NSMutableArray*)::$_2::operator()() const + 68 (RCTTurboModule.mm:380)
7 MhMap 0x000000010289a978 decltype(std::declval<facebook::react::ObjCTurboModule::performMethodInvocation(facebook::jsi::Runtime&, bool, char const*, NSInvocation*, NSMutableArray*)::$_2&>()()) std::__1::__invoke[abi:ue1700... + 68 (invoke.h:340)
8 MhMap 0x000000010289a978 void std::__1::__invoke_void_return_wrapper<void, true>::__call[abi:ue170006]<facebook::react::ObjCTurboModule::performMethodInvocation(facebook::jsi::Runtime&, bool, char const*, NSInvocation*, NS... + 68 (invoke.h:415)
9 MhMap 0x000000010289a978 std::__1::__function::__alloc_func<facebook::react::ObjCTurboModule::performMethodInvocation(facebook::jsi::Runtime&, bool, char const*, NSInvocation*, NSMutableArray*)::$_2, std::__1::allocator<fa... + 68 (function.h:193)
10 MhMap 0x000000010289a978 std::__1::__function::__func<facebook::react::ObjCTurboModule::performMethodInvocation(facebook::jsi::Runtime&, bool, char const*, NSInvocation*, NSMutableArray*)::$_2, std::__1::allocator<facebook... + 88 (function.h:364)
11 libdispatch.dylib 0x000000019383513c _dispatch_call_block_and_release + 32 (init.c:1530)
12 libdispatch.dylib 0x0000000193836dd4 _dispatch_client_callout + 20 (object.m:576)
13 libdispatch.dylib 0x000000019383e400 _dispatch_lane_serial_drain + 748 (queue.c:3900)
14 libdispatch.dylib 0x000000019383ef30 _dispatch_lane_invoke + 380 (queue.c:3991)
15 libdispatch.dylib 0x0000000193849cb4 _dispatch_root_queue_drain_deferred_wlh + 288 (queue.c:6998)
16 libdispatch.dylib 0x0000000193849528 _dispatch_workloop_worker_thread + 404 (queue.c:6592)
17 libsystem_pthread.dylib 0x00000001e83e0934 _pthread_wqthread + 288 (pthread.c:2696)
18 libsystem_pthread.dylib 0x00000001e83dd0cc start_wqthread + 8 (:-1)
For information, I did a bit more debugging.
Here are the related line portion in the bridge :
// RNMBXShapeSourceModule.mm:56
RCT_EXPORT_METHOD(getClusterLeaves:(nonnull NSNumber *)viewRef featureJSON:(NSString *)featureJSON number:(double)number offset:(double)offset resolve:(RCTPromiseResolveBlock)resolve reject:(RCTPromiseRejectBlock)reject)
{
[self withShapeSource:viewRef block:^(RNMBXShapeSource *view) {
[RNMBXShapeSourceViewManager getClusterLeavesWithShapeSource:view featureJSON:featureJSON number:number offset:offset resolver:resolve rejecter:reject];
} reject:reject methodName:@"getClusterLeaves"];
}
I'm absolutely not competent in native iOS, here is the ChatGPT insight if that helps :
This crash log suggests an issue with memory management, particularly involving objc_retain in the context of the getClusterLeaves method. Here's a breakdown of the potential problem and solutions:
Problem Analysis
Crash Context
The crash happens in the objc_retain function, indicating an issue with object lifecycle management (e.g., an object being released prematurely or being incorrectly retained).
Error Trace
The issue is in the RNMBXShapeSourceModule method, specifically at [RNMBXShapeSourceModule getClusterLeaves:featureJSON:number:offset:resolve:reject:].
The block invocation in [self withShapeSource:viewRef block:] may not properly handle the lifecycle of the RNMBXShapeSource.
Underlying Causes
Null or Invalid Object: The view object passed to the block could be null or improperly managed.
Retain Cycle or Weak Reference: If the view object is weakly referenced but is deallocated before being used, the code might attempt to retain a dangling pointer.
TurboModule Interaction: TurboModule bindings might be passing incorrect or corrupted references to Objective-C objects, causing improper retain/release behavior.
same here!
temporary disabled new arch (RCT_NEW_ARCH_ENABLED=0 pod install)
Fixed it with a patch-package.
Edit RNMBXShapeSourceModule.mm and change
RCT_EXPORT_METHOD(getClusterLeaves:(nonnull NSNumber *)viewRef featureJSON:(NSString *)featureJSON number:(double)number offset:(double)offset resolve:(RCTPromiseResolveBlock)resolve reject:(RCTPromiseRejectBlock)reject)
{
[self withShapeSource:viewRef block:^(RNMBXShapeSource *view) {
[RNMBXShapeSourceViewManager getClusterLeavesWithShapeSource:view featureJSON:featureJSON number:number offset:offset resolver:resolve rejecter:reject];
} reject:reject methodName:@"getClusterLeaves"];
}
to
RCT_EXPORT_METHOD(getClusterLeaves:(nonnull NSNumber *)viewRef featureJSON:(NSString *)featureJSON number:(long)number offset:(long)offset resolve:(RCTPromiseResolveBlock)resolve reject:(RCTPromiseRejectBlock)reject)
{
[self withShapeSource:viewRef block:^(RNMBXShapeSource *view) {
[RNMBXShapeSourceViewManager getClusterLeavesWithShapeSource:view featureJSON:featureJSON number:number offset:offset resolver:resolve rejecter:reject];
} reject:reject methodName:@"getClusterLeaves"];
}
Then edit RNMBXShapeSourceViewManager.swift
And set the number value to 999. Adjust to your need. This is essentially hardcoding it since it's not reading correctly from the JS code. I don't have more energy to figure out why haha.
e.g. change
@objc public static func getClusterLeaves(
shapeSource: RNMBXShapeSource,
featureJSON: String,
number: uint,
offset: uint,
resolver: @escaping RCTPromiseResolveBlock,
rejecter: @escaping RCTPromiseRejectBlock) -> Void
{
shapeSource.getClusterLeaves(featureJSON, number: 999, offset: offset) { result in
switch result {
case .success(let features):
logged("getClusterLeaves", rejecter: rejecter) {
let featuresJSON : Any = try features.features.toJSON()
resolver([
"data": ["type":"FeatureCollection", "features": featuresJSON]
])
}
case .failure(let error):
rejecter(error.localizedDescription, "Error.getClusterLeaves", error)
}
}
}
to
@objc public static func getClusterLeaves(
shapeSource: RNMBXShapeSource,
featureJSON: String,
number: uint,
offset: uint,
resolver: @escaping RCTPromiseResolveBlock,
rejecter: @escaping RCTPromiseRejectBlock) -> Void
{
shapeSource.getClusterLeaves(featureJSON, number: number, offset: offset) { result in
switch result {
case .success(let features):
logged("getClusterLeaves", rejecter: rejecter) {
let featuresJSON : Any = try features.features.toJSON()
resolver([
"data": ["type":"FeatureCollection", "features": featuresJSON]
])
}
case .failure(let error):
rejecter(error.localizedDescription, "Error.getClusterLeaves", error)
}
}
}
Then create a patch-package so the change persists between npm installs:
yarn add patch-package postinstall-postinstall --dev
or
npm install patch-package postinstall-postinstall --save-dev
then
npx patch-package @rnmapbox/maps
thanks, @nomadnic, here is a patch file to 10.1.33 latest (at the moment) version
diff --git a/node_modules/@rnmapbox/maps/ios/RNMBX/RNMBXShapeSourceModule.mm b/node_modules/@rnmapbox/maps/ios/RNMBX/RNMBXShapeSourceModule.mm
index d779a6c..17a8c89 100644
--- a/node_modules/@rnmapbox/maps/ios/RNMBX/RNMBXShapeSourceModule.mm
+++ b/node_modules/@rnmapbox/maps/ios/RNMBX/RNMBXShapeSourceModule.mm
@@ -53,7 +53,7 @@ - (void)withShapeSource:(nonnull NSNumber*)viewRef block:(void (^)(RNMBXShapeSou
} reject:reject methodName:@"getClusterChildren"];
}
-RCT_EXPORT_METHOD(getClusterLeaves:(nonnull NSNumber *)viewRef featureJSON:(NSString *)featureJSON number:(double)number offset:(double)offset resolve:(RCTPromiseResolveBlock)resolve reject:(RCTPromiseRejectBlock)reject)
+RCT_EXPORT_METHOD(getClusterLeaves:(nonnull NSNumber *)viewRef featureJSON:(NSString *)featureJSON number:(long)number offset:(long)offset resolve:(RCTPromiseResolveBlock)resolve reject:(RCTPromiseRejectBlock)reject)
{
[self withShapeSource:viewRef block:^(RNMBXShapeSource *view) {
[RNMBXShapeSourceViewManager getClusterLeavesWithShapeSource:view featureJSON:featureJSON number:number offset:offset resolver:resolve rejecter:reject];
diff --git a/node_modules/@rnmapbox/maps/ios/RNMBX/RNMBXShapeSourceViewManager.swift b/node_modules/@rnmapbox/maps/ios/RNMBX/RNMBXShapeSourceViewManager.swift
index 84f0407..f768c98 100644
--- a/node_modules/@rnmapbox/maps/ios/RNMBX/RNMBXShapeSourceViewManager.swift
+++ b/node_modules/@rnmapbox/maps/ios/RNMBX/RNMBXShapeSourceViewManager.swift
@@ -30,28 +30,28 @@ extension RNMBXShapeSourceViewManager {
}
}
- @objc public static func getClusterLeaves(
- shapeSource: RNMBXShapeSource,
- featureJSON: String,
- number: uint,
- offset: uint,
- resolver: @escaping RCTPromiseResolveBlock,
- rejecter: @escaping RCTPromiseRejectBlock) -> Void
- {
- shapeSource.getClusterLeaves(featureJSON, number: number, offset: offset) { result in
- switch result {
- case .success(let features):
- logged("getClusterLeaves", rejecter: rejecter) {
- let featuresJSON : Any = try features.features.toJSON()
- resolver([
- "data": ["type":"FeatureCollection", "features": featuresJSON]
- ])
- }
- case .failure(let error):
- rejecter(error.localizedDescription, "Error.getClusterLeaves", error)
+ @objc public static func getClusterLeaves(
+ shapeSource: RNMBXShapeSource,
+ featureJSON: String,
+ number: uint,
+ offset: uint,
+ resolver: @escaping RCTPromiseResolveBlock,
+ rejecter: @escaping RCTPromiseRejectBlock) -> Void
+ {
+ shapeSource.getClusterLeaves(featureJSON, number: 999, offset: offset) { result in
+ switch result {
+ case .success(let features):
+ logged("getClusterLeaves", rejecter: rejecter) {
+ let featuresJSON : Any = try features.features.toJSON()
+ resolver([
+ "data": ["type":"FeatureCollection", "features": featuresJSON]
+ ])
+ }
+ case .failure(let error):
+ rejecter(error.localizedDescription, "Error.getClusterLeaves", error)
+ }
}
- }
- }
+ }
@objc public static func getClusterChildren(
shapeSource: RNMBXShapeSource,
```diff --git a/node_modules/@rnmapbox/maps/ios/RNMBX/RNMBXShapeSourceModule.mm b/node_modules/@rnmapbox/maps/ios/RNMBX/RNMBXShapeSourceModule.mm
index d779a6c..17a8c89 100644
--- a/node_modules/@rnmapbox/maps/ios/RNMBX/RNMBXShapeSourceModule.mm
+++ b/node_modules/@rnmapbox/maps/ios/RNMBX/RNMBXShapeSourceModule.mm
@@ -53,7 +53,7 @@ - (void)withShapeSource:(nonnull NSNumber*)viewRef block:(void (^)(RNMBXShapeSou
} reject:reject methodName:@"getClusterChildren"];
}
-RCT_EXPORT_METHOD(getClusterLeaves:(nonnull NSNumber *)viewRef featureJSON:(NSString *)featureJSON number:(double)number offset:(double)offset resolve:(RCTPromiseResolveBlock)resolve reject:(RCTPromiseRejectBlock)reject)
+RCT_EXPORT_METHOD(getClusterLeaves:(nonnull NSNumber *)viewRef featureJSON:(NSString *)featureJSON number:(long)number offset:(long)offset resolve:(RCTPromiseResolveBlock)resolve reject:(RCTPromiseRejectBlock)reject)
{
[self withShapeSource:viewRef block:^(RNMBXShapeSource *view) {
[RNMBXShapeSourceViewManager getClusterLeavesWithShapeSource:view featureJSON:featureJSON number:number offset:offset resolver:resolve rejecter:reject];
diff --git a/node_modules/@rnmapbox/maps/ios/RNMBX/RNMBXShapeSourceViewManager.swift b/node_modules/@rnmapbox/maps/ios/RNMBX/RNMBXShapeSourceViewManager.swift
index 84f0407..f768c98 100644
--- a/node_modules/@rnmapbox/maps/ios/RNMBX/RNMBXShapeSourceViewManager.swift
+++ b/node_modules/@rnmapbox/maps/ios/RNMBX/RNMBXShapeSourceViewManager.swift
@@ -30,28 +30,28 @@ extension RNMBXShapeSourceViewManager {
}
}
- @objc public static func getClusterLeaves(
- shapeSource: RNMBXShapeSource,
- featureJSON: String,
- number: uint,
- offset: uint,
- resolver: @escaping RCTPromiseResolveBlock,
- rejecter: @escaping RCTPromiseRejectBlock) -> Void
- {
- shapeSource.getClusterLeaves(featureJSON, number: number, offset: offset) { result in
- switch result {
- case .success(let features):
- logged("getClusterLeaves", rejecter: rejecter) {
- let featuresJSON : Any = try features.features.toJSON()
- resolver([
- "data": ["type":"FeatureCollection", "features": featuresJSON]
- ])
- }
- case .failure(let error):
- rejecter(error.localizedDescription, "Error.getClusterLeaves", error)
+ @objc public static func getClusterLeaves(
+ shapeSource: RNMBXShapeSource,
+ featureJSON: String,
+ number: uint,
+ offset: uint,
+ resolver: @escaping RCTPromiseResolveBlock,
+ rejecter: @escaping RCTPromiseRejectBlock) -> Void
+ {
+ shapeSource.getClusterLeaves(featureJSON, number: 999, offset: offset) { result in
+ switch result {
+ case .success(let features):
+ logged("getClusterLeaves", rejecter: rejecter) {
+ let featuresJSON : Any = try features.features.toJSON()
+ resolver([
+ "data": ["type":"FeatureCollection", "features": featuresJSON]
+ ])
+ }
+ case .failure(let error):
+ rejecter(error.localizedDescription, "Error.getClusterLeaves", error)
+ }
}
- }
- }
+ }
@objc public static func getClusterChildren(
shapeSource: RNMBXShapeSource,
The issue is highly relevant when using "react-native": "0.77.2" together with the Magnus-V-main branch.
If you apply the fix as described here, it works correctly.
I've tried it in 1.2.5 and it worked
'visibleMarkers', [ { properties: { icon: 'example' },
id: 'a-feature',
geometry: { type: 'Point', coordinates: [ -74.00597, 40.71427 ] },
type: 'Feature' },
{ properties: { icon: 'example' },
id: 'b-feature',
geometry: { type: 'Point', coordinates: [ -74.001097, 40.71527 ] },
type: 'Feature' },
{ properties: { icon: 'example' },
id: 'c-feature',
geometry: { type: 'Point', coordinates: [ -74.00697, 40.72427 ] },
type: 'Feature' } ]
