module Environment

val add : key:string -> data:string -> t -> t

val find : key:string -> t -> string option

val find_exn : key:string -> t -> string

val mem : key:string -> t -> bool

val remove : key:string -> t -> t

val import_from_sys : ?default:string -> key:string -> t -> t

val append_to_path : ?where:[ ] -> key:string -> data:string -> t -> t

val to_exec_env : t -> string list

val of_exec_env : string array -> t