typemediaImage= {
mutablesrc:string,
mutablesizes?:string,
mutabletype_?:string,
}

typemediaMetadata= {
mutabletitle:string,
mutableartist:string,
mutablealbum:string,
mutableartwork:array<mediaImage>,
}

typemediaMetadataInit= {
mutabletitle?:string,
mutableartist?:string,
mutablealbum?:string,
mutableartwork?:array<mediaImage>,
}

typemediaPositionState= {
mutableduration?:float,
mutableplaybackRate?:float,
mutableposition?:float,
}

typemediaSession= {
mutablemetadata:Null.t<mediaMetadata>,
mutableplaybackState:mediaSessionPlaybackState,
}

typemediaSessionAction=
| @as("nexttrack")Nexttrack
| @as("pause")Pause
| @as("play")Play
| @as("previoustrack")Previoustrack
| @as("seekbackward")Seekbackward
| @as("seekforward")Seekforward
| @as("seekto")Seekto
| @as("skipad")Skipad
| @as("stop")Stop

typemediaSessionActionDetails= {
mutableaction:mediaSessionAction,
mutableseekOffset?:float,
mutableseekTime?:float,
mutablefastSeek?:bool,
}

typemediaSessionActionHandler=mediaSessionActionDetails=>unit

typemediaSessionPlaybackState=
| @as("none")None
| @as("paused")Paused
| @as("playing")Playing