Try macro variant

README.md

@@ -4,7 +4,7 @@ Utilities for [clojure.spec](https://github.com/clojure/spec.alpha).
 
 ## Installation
 
-Make sure `[spec-coerce "1.0.0-alpha9"]` (or similar) is present on the classpath if you want to use `nedap.util.spec.api/coerce-map-indicating-invalidity`. 
+Make sure `[spec-coerce "1.0.0-alpha9"]` (or similar) is present on the classpath and loaded if you want to use `nedap.util.spec.api/coerce-map-indicating-invalidity`. 
 
 #### Coordinates
 

src/nedap/utils/spec/api.cljc

@@ -2,8 +2,9 @@
   (:require
    #?(:clj [clojure.spec.alpha :as spec] :cljs [cljs.spec.alpha :as spec])
    [nedap.utils.spec.impl.check]
-   [nedap.utils.spec.impl.spec-coerce :refer [spec-coerce-available?]])
-  #?(:cljs (:require-macros [nedap.utils.spec.api :refer [check!]])))
+   [nedap.utils.spec.impl.spec-coerce :refer [when-spec-coerce-available?]])
+  #?(:cljs (:require-macros [nedap.utils.spec.api :refer [check!]]
+                            [nedap.utils.spec.impl.spec-coerce :refer [when-spec-coerce-available?]])))
 
 #?(:clj
    (defmacro check!
@@ -16,7 +17,7 @@
      {:pre [(-> args count even?)]}
      `(nedap.utils.spec.impl.check/check! ~@args)))
 
-(when (spec-coerce-available?)
+(when-spec-coerce-available?
  (defn coerce-map-indicating-invalidity
    "Tries to coerce the map `m` according to spec `spec`.
 
@@ -27,6 +28,6 @@
    ;; Else spec-coerce will fail to coerce things.
    {:pre [(check! qualified-ident? spec
                   map? m)]}
-   (let [m ((requiring-resolve 'spec-coerce.core/coerce) spec m)]
+   (let [m ((resolve 'spec-coerce.core/coerce) spec m)]
      (cond-> m
              (not (spec/valid? spec m)) (assoc ::invalid? true)))))

src/nedap/utils/spec/impl/spec_coerce.cljc

@@ -1,8 +1,9 @@
 (ns nedap.utils.spec.impl.spec-coerce)
 
-(defn spec-coerce-available? []
-  (try
-    (require 'spec-coerce.core)
-    true
-    (catch Exception _
-      false)))
+(defmacro when-spec-coerce-available? [& body]
+  (when (try
+          (requiring-resolve 'spec-coerce.core/coerce)
+          true
+          (catch Exception _
+            false))
+    `(do ~@body)))

test/unit/nedap/utils/spec/api.cljc

@@ -3,6 +3,7 @@
    #?(:clj [clojure.spec.alpha :as spec] :cljs [cljs.spec.alpha :as spec])
    #?(:clj [clojure.string :as str])
    #?(:clj [clojure.test :refer [deftest testing are is use-fixtures]] :cljs [cljs.test :refer-macros [deftest testing is are] :refer [use-fixtures]])
+   [spec-coerce.core]
    [nedap.utils.spec.api :as sut]))
 
 (def validation-failed #"Validation failed")