ServiceWorker 
    abstract external class ServiceWorker : EventTarget, AbstractWorker, UnionMessagePortOrServiceWorker, UnionClientOrMessagePortOrServiceWorker(source)
Exposes the JavaScript ServiceWorker to Kotlin
Since Kotlin
1.1Functions
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                  fun addEventListener(type: String, callback: (Event) -> Unit?, options: dynamic = definedExternally)
Since Kotlin 1.1
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                  Since Kotlin 1.1
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                  Since Kotlin 1.1
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                  fun removeEventListener(type: String, callback: (Event) -> Unit?, options: dynamic = definedExternally)
fun removeEventListener(type: String, callback: EventListener?, options: dynamic = definedExternally)
Since Kotlin 1.1