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Experimental WebAPI

Performance

Values

addEventListener

Appends an event listener for events whose type attribute value is type. The callback argument sets the callback that will be invoked when the event is dispatched.

The options argument sets listener-specific options. For compatibility this can be a boolean, in which case the method behaves exactly as if the value was specified as options's capture.

When set to true, options's capture prevents callback from being invoked when the event's eventPhase attribute value is BUBBLING_PHASE. When false (or not present), callback will not be invoked when event's eventPhase attribute value is CAPTURING_PHASE. Either way, callback will be invoked if event's eventPhase attribute value is AT_TARGET.

When set to true, options's passive indicates that the callback will not cancel the event by invoking preventDefault(). This is used to enable performance optimizations described in § 2.8 Observing event listeners.

When set to true, options's once indicates that the callback will only be invoked once after which the event listener will be removed.

If an AbortSignal is passed for options's signal, then the event listener will be removed when signal is aborted.

The event listener is appended to target's event listener list and is not appended if it has the same type, callback, and capture. Read more on MDN

let addEventListener: (
  WebAPI.PerformanceAPI.performance,
  ~type_: WebAPI.EventAPI.eventType,
  ~callback: WebAPI.EventAPI.eventListener<'event>,
  ~options: WebAPI.EventAPI.addEventListenerOptions=?,
) => unit

Parameters

WebAPI.PerformanceAPI.performance WebAPI.EventAPI.eventType WebAPI.EventAPI.eventListener option< WebAPI.EventAPI.addEventListenerOptions >

Return type

unit

addEventListener_useCapture

Appends an event listener for events whose type attribute value is type. The callback argument sets the callback that will be invoked when the event is dispatched.

The options argument sets listener-specific options. For compatibility this can be a boolean, in which case the method behaves exactly as if the value was specified as options's capture.

When set to true, options's capture prevents callback from being invoked when the event's eventPhase attribute value is BUBBLING_PHASE. When false (or not present), callback will not be invoked when event's eventPhase attribute value is CAPTURING_PHASE. Either way, callback will be invoked if event's eventPhase attribute value is AT_TARGET.

When set to true, options's passive indicates that the callback will not cancel the event by invoking preventDefault(). This is used to enable performance optimizations described in § 2.8 Observing event listeners.

When set to true, options's once indicates that the callback will only be invoked once after which the event listener will be removed.

If an AbortSignal is passed for options's signal, then the event listener will be removed when signal is aborted.

The event listener is appended to target's event listener list and is not appended if it has the same type, callback, and capture. Read more on MDN

let addEventListener_useCapture: (
  WebAPI.PerformanceAPI.performance,
  ~type_: WebAPI.EventAPI.eventType,
  ~callback: WebAPI.EventAPI.eventListener<'event>,
) => unit

Parameters

WebAPI.PerformanceAPI.performance WebAPI.EventAPI.eventType WebAPI.EventAPI.eventListener

Return type

unit

asEventTarget

let asEventTarget: WebAPI.PerformanceAPI.performance => WebAPI.EventAPI.eventTarget

Parameters

WebAPI.PerformanceAPI.performance

Return type

WebAPI.EventAPI.eventTarget

clearMarks

Read more on MDN

let clearMarks: (
  WebAPI.PerformanceAPI.performance,
  ~markName: string=?,
) => unit

Parameters

WebAPI.PerformanceAPI.performance option< string >

Return type

unit

clearMeasures

Read more on MDN

let clearMeasures: (
  WebAPI.PerformanceAPI.performance,
  ~measureName: string=?,
) => unit

Parameters

WebAPI.PerformanceAPI.performance option< string >

Return type

unit

clearResourceTimings

Read more on MDN

let clearResourceTimings: WebAPI.PerformanceAPI.performance => unit

Parameters

WebAPI.PerformanceAPI.performance

Return type

unit

dispatchEvent

Dispatches a synthetic event event to target and returns true if either event's cancelable attribute value is false or its preventDefault() method was not invoked, and false otherwise. Read more on MDN

let dispatchEvent: (
  WebAPI.PerformanceAPI.performance,
  WebAPI.EventAPI.event,
) => bool

Parameters

WebAPI.PerformanceAPI.performance WebAPI.EventAPI.event

Return type

bool

getEntries

Read more on MDN

let getEntries: WebAPI.PerformanceAPI.performance => WebAPI.PerformanceAPI.performanceEntryList

Parameters

WebAPI.PerformanceAPI.performance

Return type

WebAPI.PerformanceAPI.performanceEntryList

getEntriesByName

Read more on MDN

let getEntriesByName: (
  WebAPI.PerformanceAPI.performance,
  ~name: string,
  ~type_: string=?,
) => WebAPI.PerformanceAPI.performanceEntryList

Parameters

WebAPI.PerformanceAPI.performance string option< string >

Return type

WebAPI.PerformanceAPI.performanceEntryList

getEntriesByType

Read more on MDN

let getEntriesByType: (
  WebAPI.PerformanceAPI.performance,
  string,
) => WebAPI.PerformanceAPI.performanceEntryList

Parameters

WebAPI.PerformanceAPI.performance string

Return type

WebAPI.PerformanceAPI.performanceEntryList

mark

Read more on MDN

let mark: (
  WebAPI.PerformanceAPI.performance,
  ~markName: string,
  ~markOptions: WebAPI.PerformanceAPI.performanceMarkOptions=?,
) => WebAPI.PerformanceAPI.performanceMark

Parameters

WebAPI.PerformanceAPI.performance string option< WebAPI.PerformanceAPI.performanceMarkOptions >

Return type

WebAPI.PerformanceAPI.performanceMark

measure

Read more on MDN

let measure: (
  WebAPI.PerformanceAPI.performance,
  ~measureName: string,
  ~startOrMeasureOptions: string=?,
  ~endMark: string=?,
) => WebAPI.PerformanceAPI.performanceMeasure

Parameters

WebAPI.PerformanceAPI.performance string option< string > option< string >

Return type

WebAPI.PerformanceAPI.performanceMeasure

measure2

Read more on MDN

let measure2: (
  WebAPI.PerformanceAPI.performance,
  ~measureName: string,
  ~startOrMeasureOptions: WebAPI.PerformanceAPI.performanceMeasureOptions=?,
  ~endMark: string=?,
) => WebAPI.PerformanceAPI.performanceMeasure

Parameters

WebAPI.PerformanceAPI.performance string option< WebAPI.PerformanceAPI.performanceMeasureOptions > option< string >

Return type

WebAPI.PerformanceAPI.performanceMeasure

now

Read more on MDN

let now: WebAPI.PerformanceAPI.performance => float

Parameters

WebAPI.PerformanceAPI.performance

Return type

float

removeEventListener

Removes the event listener in target's event listener list with the same type, callback, and options. Read more on MDN

let removeEventListener: (
  WebAPI.PerformanceAPI.performance,
  ~type_: WebAPI.EventAPI.eventType,
  ~callback: WebAPI.EventAPI.eventListener<'event>,
  ~options: WebAPI.EventAPI.eventListenerOptions=?,
) => unit

Parameters

WebAPI.PerformanceAPI.performance WebAPI.EventAPI.eventType WebAPI.EventAPI.eventListener option< WebAPI.EventAPI.eventListenerOptions >

Return type

unit

removeEventListener_useCapture

Removes the event listener in target's event listener list with the same type, callback, and options. Read more on MDN

let removeEventListener_useCapture: (
  WebAPI.PerformanceAPI.performance,
  ~type_: WebAPI.EventAPI.eventType,
  ~callback: WebAPI.EventAPI.eventListener<'event>,
) => unit

Parameters

WebAPI.PerformanceAPI.performance WebAPI.EventAPI.eventType WebAPI.EventAPI.eventListener

Return type

unit

setResourceTimingBufferSize

Read more on MDN

let setResourceTimingBufferSize: (WebAPI.PerformanceAPI.performance, int) => unit

Parameters

WebAPI.PerformanceAPI.performance int

Return type

unit

toJSON

Read more on MDN

let toJSON: WebAPI.PerformanceAPI.performance => Dict.t<string>

Parameters

WebAPI.PerformanceAPI.performance

Return type

Dict.t< string >