show-help, man-page or info-manual can be used to specify the
documentation for the prefix and its suffixes. The command
transient-help uses the method transient-show-help (which see) to
lookup and use these values.
history-key If multiple prefix commands should share a single value,
then this slot has to be set to the same value for all of them. You
probably don’t want that.
transient-suffix and transient-non-suffix play a part when
determining whether the currently active transient prefix command
remains active/transient when a suffix or arbitrary non-suffix
command is invoked. See Transient State.
incompatible A list of lists. Each sub-list specifies a set of
mutually exclusive arguments. Enabling one of these arguments
causes the others to be disabled. An argument may appear in
multiple sub-lists.
scope For some transients it might be necessary to have a sort of
secondary value, called a “scope”. See transient-define-prefix.
These slots are mostly intended for internal use. They should not be
set in calls to transient-define-prefix.
prototype When a transient prefix command is invoked, then a clone
of that object is stored in the global variable transient--prefix
and the prototype is stored in the clone’s prototype slot.
command The command, a symbol. Each transient prefix command
consists of a command, which is stored in a symbol’s function slot
and an object, which is stored in the transient--prefix property
of the same symbol.
level The level of the prefix commands. The suffix commands whose
layer is equal or lower are displayed. see Enabling and Disabling Suffixes.
value The likely outdated value of the prefix. Instead of accessing
this slot directly you should use the function transient-get-value,
which is guaranteed to return the up-to-date value.
history and history-pos are used to keep track of historic values.
Unless you implement your own transient-infix-read method you should
not have to deal with these slots.