Properties
animations
animations: Record<string, Animation>
fontMetrics
fontMetrics: Record<string, FontMetric>
fonts
fonts: Record<string, Font>
ninePatches
ninePatches: Record<string, NineSlice>
origins
origins: Origin[]
slices
slices: Record<string, number>
textures
textures: Texture[]
JSON format of a SpriteSheet