julia> typeof(GLMakie.SHADER_DIR)
RelocatableFolders.Path
julia> typeof(joinpath(GLMakie.SHADER_DIR, "postprocessing/fullscreen.vert"))
String
julia> typeof(GLMakie.SHADER_DIR)
RelocatableFolders.Path
julia> typeof(joinpath(GLMakie.SHADER_DIR, "postprocessing/fullscreen.vert"))
String