diff --git a/.gitignore b/.gitignore
index bc7fc55..b6ee8b5 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,5 @@
+lib/
+
 # Logs
 logs
 *.log
diff --git a/lib/index.js b/lib/index.js
deleted file mode 100644
index 4c2d610..0000000
--- a/lib/index.js
+++ /dev/null
@@ -1,17 +0,0 @@
-//      
-const crypto = require('crypto')
-
-module.exports = function (size        )         {
-  return {
-    expand (data        )         {
-      const buffer = crypto.randomBytes(data.length < size - 4 ? size : data.length + 4)
-      buffer.writeUInt32BE(data.length, 0)
-      data.copy(buffer, 4, 0)
-      return buffer
-    },
-    shrink (buffer        )         {
-      const dataLen = buffer.readUInt32BE(0)
-      return buffer.slice(4, dataLen + 4)
-    }
-  }
-}
diff --git a/package.json b/package.json
index cc95f78..8d80fc8 100644
--- a/package.json
+++ b/package.json
@@ -9,13 +9,17 @@
   "license": "MIT",
   "author": "Exodus Movement, Inc.",
   "main": "./lib/index.js",
+  "files": [
+    "src/"
+  ],
   "repository": {
     "type": "git",
     "url": "git+https://github.com/ExodusMovement/buffer-noise.git"
   },
   "scripts": {
-    "build": "flow-remove-types ./src/index.js > ./lib/index.js",
+    "build": "make-dir lib && flow-remove-types ./src/index.js > ./lib/index.js",
     "lint": "standard",
+    "prepare": "npm run build",
     "pretest": "npm run build",
     "test": "npm run lint && flow check && npm run unit",
     "unit": "tape -r flow-remove-types/register ./test/index.js | tf-spec"
@@ -25,6 +29,7 @@
     "babel-eslint": "^7.2.1",
     "flow-bin": "^0.43.0",
     "flow-remove-types": "^1.2.0",
+    "make-dir-cli": "^3.0.0",
     "standard": "^10.0.0",
     "tape": "^4.6.3"
   },