OpamFile.Switch_configtype t = {opam_version : OpamVersion.t; | 
synopsis : string; | 
repos : OpamTypes.repository_name list option; | 
paths : (OpamTypes.std_path * string) list; | 
variables : (OpamTypes.variable * OpamTypes.variable_contents) list; | 
opam_root : OpamTypes.dirname option; | 
wrappers : Wrappers.t; | 
env : OpamTypes.env_update list; | 
invariant : OpamFormula.t; | 
depext_bypass : OpamSysPkg.Set.t; | 
}val variable : t -> OpamTypes.variable -> OpamTypes.variable_contents optionval path : t -> OpamTypes.std_path -> string optionval wrappers : t -> Wrappers.tval sections : (string * (t, (string option * OpamParserTypes.FullPos.opamfile_item list) list) OpamPp.field_parser) listval fields : (string * (t, OpamParserTypes.FullPos.value) OpamPp.field_parser) listval to_list : ?filename:'a typed_file -> t -> (string * OpamParserTypes.FullPos.value) listinclude IO_FILE with type t := tval 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 -> stringval oldest_compatible_format_version : OpamVersion.t