class js.html.MediaKeySession extends EventTarget

var closed:Promise<Void>

var error:MediaKeyError

var expiration:Float

var keySystem:String

var sessionId:String

function close():Promise<Void>

function generateRequest(initDataType:String, initData:EitherType<ArrayBufferView, ArrayBuffer>):Promise<Void>

function getUsableKeyIds():Promise<Array<ArrayBuffer>>

function load(sessionId:String):Promise<Bool>

function remove():Promise<Void>

function update(response:EitherType<ArrayBufferView, ArrayBuffer>):Promise<Void>