React Native CDP Status

Tracing Domain

Methods

Tracing.end #

Stop trace events collection.

Tracing.end is implemented as a stub only.

facebook/react-native/…/HostAgent.cpp:157

Tracing.start #

Start trace events collection.

Tracing.start is implemented as a stub only.

facebook/react-native/…/HostAgent.cpp:149

Parameters

categories
Optional

string

Category/tag filter

ExperimentalDeprecated

options
Optional

string

Tracing options

ExperimentalDeprecated

bufferUsageReportingInterval
Optional

number

If set, the agent will issue bufferUsage events at this interval, specified in milliseconds

Experimental

transferMode
Optional

string

Whether to report trace events as series of dataCollected events or to save trace to a stream (defaults to ReportEvents).

Allowed values: ReportEvents, ReturnAsStream

streamFormat
Optional

StreamFormat

Trace data format to use. This only applies when using ReturnAsStream transfer mode (defaults to json).

streamCompression
Optional

StreamCompression

Compression format to use. This only applies when using ReturnAsStream transfer mode (defaults to none)

Experimental

traceConfig
Optional

TraceConfig

perfettoConfig
Optional

string

Base64-encoded serialized perfetto.protos.TraceConfig protobuf message When specified, the parameters categories, options, traceConfig are ignored. (Encoded as a base64 string when passed over JSON)

Experimental

tracingBackend
Optional

TracingBackend

Backend type (defaults to auto)

Experimental

Tracing.getCategories Experimental#

Gets supported tracing categories.

Return object

categories

array[ string ]

A list of supported tracing categories.

Tracing.recordClockSyncMarker Experimental#

Record a clock sync marker in the trace.

Parameters

syncId

string

The ID of this clock sync marker

Tracing.requestMemoryDump Experimental#

Request a global memory dump.

Parameters

deterministic
Optional

boolean

Enables more deterministic results by forcing garbage collection

levelOfDetail
Optional

MemoryDumpLevelOfDetail

Specifies level of details in memory dump. Defaults to "detailed".

Return object

dumpGuid

string

GUID of the resulting global memory dump.

success

boolean

True iff the global memory dump succeeded.

Events

Tracing.tracingComplete #

Signals that tracing is stopped and there is no trace buffers pending flush, all data were delivered via dataCollected events.

Tracing.tracingComplete is implemented as a stub only.

facebook/react-native/…/HostAgent.cpp:163

Parameters

dataLossOccurred

boolean

Indicates whether some trace data is known to have been lost, e.g. because the trace ring buffer wrapped around.

stream
Optional

IO.StreamHandle

A handle of the stream that holds resulting trace data.

traceFormat
Optional

StreamFormat

Trace data format of returned stream.

streamCompression
Optional

StreamCompression

Compression format of returned stream.

Tracing.bufferUsage Experimental#

Tracing.bufferUsage is implemented as a stub only.

facebook/react-native/…/HostAgent.cpp:151

Parameters

percentFull
Optional

number

A number in range [0..1] that indicates the used size of event buffer as a fraction of its total size.

eventCount
Optional

number

An approximate number of events in the trace log.

value
Optional

number

A number in range [0..1] that indicates the used size of event buffer as a fraction of its total size.

Tracing.dataCollected Experimental#

Contains a bucket of collected trace events. When tracing is stopped collected events will be sent as a sequence of dataCollected events followed by tracingComplete event.

Tracing.dataCollected is implemented as a stub only.

facebook/react-native/…/HostAgent.cpp:159

Parameters

value

array[ object ]

Types

Tracing.TraceConfig #

Type: object

Properties

recordMode
Optional

string

Controls how the trace buffer stores data.

Allowed values: recordUntilFull, recordContinuously, recordAsMuchAsPossible, echoToConsole

Experimental

traceBufferSizeInKb
Optional

number

Size of the trace buffer in kilobytes. If not specified or zero is passed, a default value of 200 MB would be used.

Experimental

enableSampling
Optional

boolean

Turns on JavaScript stack sampling.

Experimental

enableSystrace
Optional

boolean

Turns on system tracing.

Experimental

enableArgumentFilter
Optional

boolean

Turns on argument filter.

Experimental

includedCategories
Optional

array[ string ]

Included category filters.

excludedCategories
Optional

array[ string ]

Excluded category filters.

syntheticDelays
Optional

array[ string ]

Configuration to synthesize the delays in tracing.

Experimental

memoryDumpConfig
Optional

MemoryDumpConfig

Configuration for memory dump triggers. Used only when "memory-infra" category is enabled.

Experimental

Tracing.MemoryDumpConfig Experimental#

Configuration for memory dump. Used only when "memory-infra" category is enabled.

Type: object

Tracing.MemoryDumpLevelOfDetail Experimental#

Details exposed when memory request explicitly declared. Keep consistent with memory_dump_request_args.h and memory_instrumentation.mojom

Type: string

Allowed values: background, light, detailed

Tracing.StreamCompression Experimental#

Compression type to use for traces returned via streams.

Type: string

Allowed values: none, gzip

Tracing.StreamFormat Experimental#

Data format of a trace. Can be either the legacy JSON format or the protocol buffer format. Note that the JSON format will be deprecated soon.

Type: string

Allowed values: json, proto

Tracing.TracingBackend Experimental#

Backend type to use for tracing. chrome uses the Chrome-integrated tracing service and is supported on all platforms. system is only supported on Chrome OS and uses the Perfetto system tracing service. auto chooses system when the perfettoConfig provided to Tracing.start specifies at least one non-Chrome data source; otherwise uses chrome.

Type: string

Allowed values: auto, chrome, system