diff --git a/.gitignore b/.gitignore
index 36ffd29..46e7934 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,3 +4,4 @@ ebin/
 erl_crash.dump
 output/
 .psc-package/
+.spago/
diff --git a/.prettierrc.js b/.prettierrc.js
new file mode 100644
index 0000000..e1bbdf5
--- /dev/null
+++ b/.prettierrc.js
@@ -0,0 +1,3 @@
+module.exports = {
+  plugins: [ process.env.PRETTIER_PURESCRIPT ],
+}
diff --git a/Makefile b/Makefile
index 30a0efb..0c82143 100644
--- a/Makefile
+++ b/Makefile
@@ -1,13 +1,16 @@
-.PHONY: ps erl all test
+.PHONY: ps erl all test clean distclean
 
-all: ps erl
+.DEFAULT_GOAL := ps
+
+all: test
 
 ps:
-	psc-package sources | xargs purs compile 'test/**/*.purs' 'src/**/*.purs' 
+	@spago build
 
-erl: ps
-	mkdir -p ebin
-	erlc -o ebin/ output/*/*.erl
+clean:
+	rm -rf output
 
-test: erl
-	erl -pa ebin -noshell -eval '(test_main@ps:main())()' -eval 'init:stop()'
+distclean: clean
+	rm -rf .spago
+test: 
+	@spago -x test.dhall test
diff --git a/spago.dhall b/spago.dhall
index 067dcdc..eedec09 100644
--- a/spago.dhall
+++ b/spago.dhall
@@ -10,7 +10,6 @@ You can edit this file as you like.
   , "foreign"
   , "integers"
   , "prelude"
-  , "unsafe-coerce"
   ]
 , packages = ./packages.dhall
 , sources = [ "src/**/*.purs" ]
diff --git a/src/Erl/Process.purs b/src/Erl/Process.purs
index 846abbc..d4d4eea 100644
--- a/src/Erl/Process.purs
+++ b/src/Erl/Process.purs
@@ -24,14 +24,13 @@ module Erl.Process
 
 import Prelude
 import Data.Either (Either)
-import Data.Time.Duration (Milliseconds(..))
+import Data.Time.Duration (Milliseconds)
 import Effect (Effect)
 import Effect.Class (class MonadEffect, liftEffect)
 import Erl.Process.Raw (ExitReason(..), ExitMsg(..)) as RawExport
-import Erl.Process.Raw (ExitReason, getPid)
+import Erl.Process.Raw (ExitReason)
 import Erl.Process.Raw as Raw
 import Foreign (Foreign)
-import Unsafe.Coerce (unsafeCoerce)
 
 newtype Process (a :: Type)
   = Process Raw.Pid