val create_output : map_output:(string -> string) -> Output.t
create_output ~map_output
creates a Log.Output.t
which will print only Message.message
to stdout, discarding any information about tags, levels, or timestamps.
map_output
will be applied to each string before printing, and is expected to be used to replace portions of output or identify which log a message came from.
This function is best used with existing Log.ts, e.g. to replace Log.Global's outputs in expect tests. If you just want a full Log.t, see create
below.