Cached environment updates (<switch>/environment)
type t = OpamTypes.spf_resolved OpamTypes.env_update listFile contents
val format_version : OpamVersion.tval empty : tEmpty file
val write : t typed_file -> t -> unitWrite some contents to a file
val read : t typed_file -> tRead file contents. Raise an error if the file does not exist.
val read_opt : t typed_file -> t optionReturns None on non-existing file
val safe_read : t typed_file -> tRead file contents. Return empty if the file does not exist.
val read_from_channel : ?filename:t typed_file -> in_channel -> tval read_from_string : ?filename:t typed_file -> string -> tval write_to_channel : ?filename:t typed_file -> out_channel -> t -> unitval write_to_string : ?filename:t typed_file -> t -> string