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diff --git a/src/lux/compiler/parallel.clj b/src/lux/compiler/parallel.clj
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+;;  Copyright (c) Eduardo Julian. All rights reserved.
+;;  This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0.
+;;  If a copy of the MPL was not distributed with this file,
+;;  You can obtain one at http://mozilla.org/MPL/2.0/.
+
+(ns lux.compiler.parallel
+  (:require (clojure [string :as string]
+                     [set :as set]
+                     [template :refer [do-template]])
+            clojure.core.async
+            clojure.core.match
+            clojure.core.match.array
+            (lux [base :as & :refer [|let |do return* return fail fail* |case]])))
+
+;; [Utils]
+(def ^:private !state! (atom {}))
+
+(def ^:private get-compiler
+  (fn [compiler]
+    (return* compiler compiler)))
+
+(defn ^:private set-compiler [compiler*]
+  (fn [_]
+    (return* compiler* compiler*)))
+
+(defn ^:private merge-modules
+  "(-> Compiler Compiler)"
+  [new old]
+  (->> old
+       (&/set$ &/$source (&/get$ &/$source new))
+       (&/set$ &/$modules (&/get$ &/$modules new))
+       (&/set$ &/$seed (&/get$ &/$seed new))
+       (&/set$ &/$host (&/get$ &/$host new))))
+
+;; [Exports]
+(defn setup!
+  "Must always call this function before using parallel compilation to make sure that the state that is being tracked is in proper shape."
+  []
+  (reset! !state! {}))
+
+(defn parallel-compilation [compile-module*]
+  (fn [module-name]
+    (|do [:let [_ (prn 'parallel-compilation module-name)]
+          pre get-compiler
+          output (compile-module* module-name)
+          post get-compiler
+          post* (set-compiler (merge-modules post pre))
+          ;; TODO: Some type-vars in the typing environment stay in
+          ;; the environment forever, making type-checking slower.
+          ;; The merging process for modules more-or-less "fixes" the
+          ;; problem by resetting the typing enviroment, but ideally
+          ;; those type-vars shouldn't survive in the first place.
+          ;; MUST FIX
+          ;; :let [_ (prn 'parallel-compilation module-name
+          ;;              'PRE (->> pre (&/get$ &/$type-vars) (&/get$ &/$mappings) &/|length)
+          ;;              'POST (->> post (&/get$ &/$type-vars) (&/get$ &/$mappings) &/|length)
+          ;;              'POST* (->> post* (&/get$ &/$type-vars) (&/get$ &/$mappings) &/|length))]
+          ]
+      (return output)
+      )))