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A backport of clojure.spec for Clojure 1.8.

NEW! clojure-future-spec is now safe to use from both 1.8 and 1.9+ environments. It’ll add nothing but won’t raise any conflicts either


For 1.8 projects, add this to your project.clj:

:dependencies [
  [org.clojure/clojure "1.8.0"]
  [clojure-future-spec "1.9.0-beta4"]
  [org.clojure/test.check "0.9.0"] ;; only if you need generators


There’re four main namespaces:


Exact copy of clojure.spec.alpha from corresponding Clojure Spec alpha:

(require '[clojure.spec.alpha :as spec])


Exact copy of clojure.spec.gen.alpha from corresponding Clojure Spec alpha:

(require '[clojure.spec.gen.alpha :as spec.gen])


Exact copy of clojure.spec.test.alpha from corresponding Clojure Spec alpha:

(require '[clojure.spec.test.alpha :as spec.test])


Copy of all new functions added to clojure.core in Clojure 1.9 (like boolean?, int?, seqable? etc):

(require '[clojure.future :refer :all])

NEW! clojure.future will define nothing when evaluated in 1.9+ environment. You can now write libraries that do this:

(require '[clojure.future :refer :all])

and it’ll work in both 1.8 and 1.9+ without any conflicts.


Distributed under the Eclipse Public License either version 1.0 or (at your option) any later version.

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