@ file : Js Qualifier (" chrome . events ") Ċ Ċ package Ġcom . chrome . platform . events Ċ Ċ /** Ġhttps :// developer . chrome . com / extensions / events # type - Event Ġ*/ Ċ sealed Ġexternal Ġclass ĠEvent < in ĠT Ġ: ĠAny > Ġ{ ĊĠ Ġ/** Ġhttps :// developer . chrome . com / extensions / events # method - Event - has Listeners Ġ*/ ĊĠ Ġfun Ġhas Listeners (): ĠBoolean ĊĊĠ Ġ/** Ġhttps :// developer . chrome . com / extensions / events # method - Event - addListener Ġ*/ ĊĠ Ġfun Ġadd Listener ( callback : ĠT ) ĊĊĠ Ġ/** Ġhttps :// developer . chrome . com / extensions / events # method - Event - remove Listener Ġ*/ ĊĠ Ġfun Ġremove Listener ( callback : ĠT ) ĊĊĠ Ġ/** Ġhttps :// developer . chrome . com / extensions / events # method - Event - has Listener Ġ*/ ĊĠ Ġfun Ġhas Listener ( callback : ĠT ) Ċ } Ċ