cljs.spec.alpha/spec

macro

previously cljs.spec/spec

clojure.spec.alpha/spec

Edit

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Source docstring:

Takes a single predicate form, e.g. can be the name of a predicate,
like even?, or a fn literal like #(< % 42). Note that it is not
generally necessary to wrap predicates in spec when using the rest
of the spec macros, only to attach a unique generator

Can also be passed the result of one of the regex ops -
cat, alt, *, +, ?, in which case it will return a regex-conforming
spec, useful when nesting an independent regex.
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Optionally takes :gen generator-fn, which must be a fn of no args that
returns a test.check generator.

Returns a spec.

(defmacro spec
  [form & {:keys [gen]}]
  (when form
    `(spec-impl '~(res &env form) ~form ~gen nil)))

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