how do I spec a function that takes only one argument?

(s/fdef my-func :args (s/cat :arg ::spec)) (to be more specific)

@lilactown Here's an example from our codebase at work

(s/fdef me
  :args (s/cat :access-token string?)
  :ret (s/nilable (s/keys :req-un [::id ::name])))

how are people enabling instrumentation in development?

I'm using CLJS. I'm thinking of doing something like:

(when js/goog.DEBUG
  (stest/instrument))

(we use clojure.spec in production code for validation and conformance so I'm puzzled as to why you'd want to avoid it? doesn't cljs use tree-shaking anyway to remove unused code?)

validating and conforming can be done without including clojure.spec.test

right?

and I'm not sure if tree-shaking is smart enough to completely eliminate the lib if it's not used in a release build. will have to test

I have a second stupid question: is there an easy way to alias a spec?

e.g. (s/def ::my-spec <point to ::other-spec>)

spec validates functions by generating example arguements and calling the function on the examples, which is not something you'll want to do in production

if you are strictly validating datastructures that should be fine

right. I know I definitely don't want to instrument my fdefs in prod 🙂

:thinking_face: I don’t think instrumentation involves generators … not saying instrument is appropriate for runtime, just might be helpful to keep things clear…

user=> (require '[clojure.spec.alpha :as s])
nil
user=> (require '[clojure.spec.test.alpha :as stest])
nil
user=> (s/fdef bar :args (s/cat :f (s/fspec :args (s/cat :x int?) :ret int?)) :ret int?)
user/bar
user=> (defn bar [f] (f 0))
#'user/bar
user=> (stest/instrument `bar)
[user/bar]
user=> (bar (fn [x] (println "called with arg" x) x))
called with arg 0
called with arg 0
called with arg 0
called with arg 0
called with arg 1
called with arg 2
called with arg -1
called with arg 0
called with arg -2
called with arg -24
called with arg 3
called with arg -2
called with arg 9
called with arg -1
called with arg -757
called with arg -1
called with arg 3
called with arg 1963
called with arg 1165
called with arg -359
called with arg -3956
called with arg 0
0

example of the generation behavior with instrument