Options for the File constructor.
File
@:optionaloptionaltype:Null<String>
The File content-type.
@:optionaloptionallastModified:Null<Float>
The last modified date of the file. Default: Date.now().
Date.now()
@:optionaloptionalendings:Null<String>
One of 'transparent' or 'native'.
'transparent'
'native'