diff --git a/.npmignore b/.npmignore
new file mode 100644
index 0000000..85de9cf
--- /dev/null
+++ b/.npmignore
@@ -0,0 +1 @@
+src
diff --git a/package.json b/package.json
index 42bfe90..8e9d339 100644
--- a/package.json
+++ b/package.json
@@ -11,11 +11,15 @@
   "license": "MIT",
   "scripts": {
     "build": "babel --out-dir lib src",
-    "start": "watch 'yarn run build' src"
+    "start": "watch 'yarn run build' src",
+    "prepublish": "yarn run build"
   },
   "devDependencies": {
     "babel-cli": "^6.18.0",
     "babel-preset-latest": "^6.16.0",
     "watch": "^1.0.1"
+  },
+  "peerDependencies": {
+    "themer": "^1.0.2"
   }
 }
diff --git a/yarn.lock b/yarn.lock
index 853e5ba..8b246b0 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1314,6 +1314,10 @@ pinkie@^2.0.0:
   version "2.0.4"
   resolved "https://registry.yarnpkg.com/pinkie/-/pinkie-2.0.4.tgz#72556b80cfa0d48a974e80e77248e80ed4f7f870"
 
+pn@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/pn/-/pn-1.0.0.tgz#1cf5a30b0d806cd18f88fc41a6b5d4ad615b3ba9"
+
 preserve@^0.2.0:
   version "0.2.0"
   resolved "https://registry.yarnpkg.com/preserve/-/preserve-0.2.0.tgz#815ed1f6ebc65926f865b310c0713bcb3315ce4b"
@@ -1563,6 +1567,14 @@ tar@~2.2.1:
     fstream "^1.0.2"
     inherits "2"
 
+themer:
+  version "1.0.2"
+  resolved "https://registry.yarnpkg.com/themer/-/themer-1.0.2.tgz#bbcd2843d998c4a890aaec40b851728acc3aab1b"
+  dependencies:
+    minimist "^1.2.0"
+    mkdirp "^0.5.1"
+    pn "^1.0.0"
+
 to-fast-properties@^1.0.1:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/to-fast-properties/-/to-fast-properties-1.0.2.tgz#f3f5c0c3ba7299a7ef99427e44633257ade43320"