Metadata attached to aseprite's atlas json, containing info about how the .aseprite file was set up.
Fields
optionalslices:Null<Array<AseAtlasSlice>>
A list of rects, 9-slices and pivots used in the Aseprite file, to be used however you desire
optionallayers:Null<Array<AseAtlasLayer>>
A list of the layers used in the Aseprite file, to be used however you desire