diff --git a/package.json b/package.json
index 8cb02d4..7ccba9a 100644
--- a/package.json
+++ b/package.json
@@ -18,7 +18,7 @@
   "scripts": {
     "cleanup": "shx rm -rf umd lib lib-esm lib-fesm typings coverage docs",
     "prebuild": "npm run cleanup && npm run verify",
-    "build": " tsc && tsc --target es2017 --outDir lib-esm && webpack",
+    "build": " tsc && tsc --target es2017 --outDir lib-esm && webpack && webpack --env.prod",
     "build:fesm:min": "uglifyjs lib-fesm/index.js --compress --mangle --source-map --output lib-fesm/index.min.js",
     "docs": "typedoc -p . --theme minimal --target 'es6' --excludeNotExported --excludePrivate --ignoreCompilerErrors --exclude \"**/src/**/__tests__/*.*\" --out docs src/",
     "test": "jest",
@@ -94,6 +94,7 @@
   "dependencies": {},
   "devDependencies": {
     "@types/jest": "20.0.0",
+    "@types/node": "7.0.31",
     "awesome-typescript-loader": "3.1.3",
     "commitizen": "2.9.6",
     "cross-var": "1.0.3",
@@ -117,6 +118,7 @@
     "uglify-js": "git://github.com/mishoo/UglifyJS2#harmony-v2.8.22",
     "uglifyjs-webpack-plugin": "0.4.3",
     "validate-commit-msg": "2.12.2",
-    "webpack": "3.0.0-rc.2"
+    "webpack": "3.0.0-rc.2",
+    "webpack-config-utils": "2.3.0"
   }
 }
diff --git a/src/Greeter.ts b/src/Greeter.ts
index eb9155a..4b3ac83 100644
--- a/src/Greeter.ts
+++ b/src/Greeter.ts
@@ -1,6 +1,16 @@
+import { IS_DEV } from './environment'
+
 export class Greeter {
   constructor(private greeting: string) {}
   greet() {
     return `Hello, ${this.greeting}!`
   }
+
+  greetMe() {
+    if (IS_DEV) {
+      console.warn('this method is deprecated, use #greet instead')
+    }
+
+    return this.greet()
+  }
 }
diff --git a/src/environment.ts b/src/environment.ts
new file mode 100644
index 0000000..97464fa
--- /dev/null
+++ b/src/environment.ts
@@ -0,0 +1,5 @@
+/** * @internal */
+export const IS_DEV = process.env.NODE_ENV === 'development'
+
+/** * @internal */
+export const IS_PROD = process.env.NODE_ENV === 'production'
diff --git a/tsconfig.json b/tsconfig.json
index f8ebfbe..24c2328 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -20,7 +20,8 @@
     "sourceMap": true,
     "outDir": "lib",
     "declaration": true,
-    "declarationDir": "typings"
+    "declarationDir": "typings",
+    "stripInternal": true
   },
   "include": [
     "./src"
diff --git a/webpack.config.js b/webpack.config.js
index 9266f9b..38f9852 100644
--- a/webpack.config.js
+++ b/webpack.config.js
@@ -1,6 +1,7 @@
 const { resolve } = require('path')
 const webpack = require('webpack')
 const UglifyJSPlugin = require('uglifyjs-webpack-plugin')
+const { getIfUtils, removeEmpty } = require('webpack-config-utils')
 
 const packageJSON = require('./package.json')
 const packageName = normalizePackageName(packageJSON.name)
@@ -11,6 +12,9 @@ const PATHS = {
   umd: resolve(__dirname, 'umd'),
   fesm: resolve(__dirname, 'lib-fesm'),
 }
+// https://webpack.js.org/configuration/configuration-types/#exporting-a-function-to-use-env
+// this is equal to 'webpack --env=dev'
+const DEFAULT_ENV = 'dev'
 
 const EXTERNALS = {
   // lodash: {
@@ -24,7 +28,7 @@ const EXTERNALS = {
 const RULES = {
   ts: {
     test: /\.tsx?$/,
-    exclude: /node_modules/,
+    include: /src/,
     use: [
       {
         loader: 'awesome-typescript-loader',
@@ -40,7 +44,7 @@ const RULES = {
   },
   tsNext: {
     test: /\.tsx?$/,
-    exclude: /node_modules/,
+    include: /src/,
     use: [
       {
         loader: 'awesome-typescript-loader',
@@ -52,28 +56,34 @@ const RULES = {
   },
 }
 
-const PLUGINS = [
-  // enable scope hoisting
-  new webpack.optimize.ModuleConcatenationPlugin(),
-  // Apply minification only on the second bundle by using a RegEx on the name, which must end with `.min.js`
-  new UglifyJSPlugin({
-    sourceMap: true,
-    include: /\.min\.js$/,
-  }),
-  new webpack.LoaderOptionsPlugin({
-    minimize: true,
-  }),
-]
-
-const config = env => {
+const config = (env = DEFAULT_ENV) => {
+  const { ifProd, ifNotProd } = getIfUtils(env)
+  const PLUGINS = removeEmpty([
+    // enable scope hoisting
+    new webpack.optimize.ModuleConcatenationPlugin(),
+    // Apply minification only on the second bundle by using a RegEx on the name, which must end with `.min.js`
+    ifProd(
+      new UglifyJSPlugin({
+        sourceMap: true,
+        include: /\.min\.js$/,
+      })
+    ),
+    new webpack.LoaderOptionsPlugin({
+      debug: false,
+      minimize: true,
+    }),
+    new webpack.DefinePlugin({
+      'process.env': { NODE_ENV: ifProd('"production"', '"development"') },
+    }),
+  ])
+
   const UMDConfig = {
     // These are the entry point of our library. We tell webpack to use
     // the name we assign later, when creating the bundle. We also use
     // the name to filter the second entry point for applying code
     // minification via UglifyJS
     entry: {
-      [packageName]: [PATHS.entryPoint],
-      [`${packageName}.min`]: [PATHS.entryPoint],
+      [ifProd(`${packageName}.min`, packageName)]: [PATHS.entryPoint],
     },
     // The output defines how and where we want the bundles. The special
     // value `[name]` in `filename` tell Webpack to use the name we defined above.
@@ -84,7 +94,7 @@ const config = env => {
       filename: '[name].js',
       libraryTarget: 'umd',
       library: LIB_NAME,
-      // libraryExport:  UMD.libName,
+      // libraryExport:  LIB_NAME,
       // will name the AMD module of the UMD build. Otherwise an anonymous define is used.
       umdNamedDefine: true,
     },
@@ -107,8 +117,7 @@ const config = env => {
 
   const FESMconfig = Object.assign({}, UMDConfig, {
     entry: {
-      index: [PATHS.entryPoint],
-      'index.min': [PATHS.entryPoint],
+      [ifProd('index.min', 'index')]: [PATHS.entryPoint],
     },
     output: {
       path: PATHS.fesm,
diff --git a/yarn.lock b/yarn.lock
index 793d91f..da2a298 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -67,6 +67,10 @@
   version "7.0.27"
   resolved "https://registry.yarnpkg.com/@types/node/-/node-7.0.27.tgz#ba5e1a87aca2b4f5817289615ffe56472927687e"
 
+"@types/node@7.0.31":
+  version "7.0.31"
+  resolved "https://registry.yarnpkg.com/@types/node/-/node-7.0.31.tgz#80ea4d175599b2a00149c29a10a4eb2dff592e86"
+
 "@types/shelljs@^0.7.0":
   version "0.7.2"
   resolved "https://registry.yarnpkg.com/@types/shelljs/-/shelljs-0.7.2.tgz#c2bdb3fe80cd7a3da08750ca898ae44c589671f3"
@@ -3739,6 +3743,10 @@ q@^1.4.1:
   version "1.5.0"
   resolved "https://registry.yarnpkg.com/q/-/q-1.5.0.tgz#dd01bac9d06d30e6f219aecb8253ee9ebdc308f1"
 
+qs@^5.2.0:
+  version "5.2.1"
+  resolved "https://registry.yarnpkg.com/qs/-/qs-5.2.1.tgz#801fee030e0b9450d6385adc48a4cc55b44aedfc"
+
 qs@~6.4.0:
   version "6.4.0"
   resolved "https://registry.yarnpkg.com/qs/-/qs-6.4.0.tgz#13e26d28ad6b0ffaa91312cd3bf708ed351e7233"
@@ -4681,6 +4689,18 @@ webidl-conversions@^4.0.0:
   version "4.0.1"
   resolved "https://registry.yarnpkg.com/webidl-conversions/-/webidl-conversions-4.0.1.tgz#8015a17ab83e7e1b311638486ace81da6ce206a0"
 
+webpack-combine-loaders@2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/webpack-combine-loaders/-/webpack-combine-loaders-2.0.0.tgz#c8cd033ec797748b569c7823f54d4481670f3e05"
+  dependencies:
+    qs "^5.2.0"
+
+webpack-config-utils@2.3.0:
+  version "2.3.0"
+  resolved "https://registry.yarnpkg.com/webpack-config-utils/-/webpack-config-utils-2.3.0.tgz#49aa66984a85a7c2c9991343137e8dd11b610afa"
+  dependencies:
+    webpack-combine-loaders "2.0.0"
+
 webpack-sources@^0.2.3:
   version "0.2.3"
   resolved "https://registry.yarnpkg.com/webpack-sources/-/webpack-sources-0.2.3.tgz#17c62bfaf13c707f9d02c479e0dcdde8380697fb"