Fixes externals configuration for UMD build.

Author: ctrlplusb

.babelrc

@@ -15,7 +15,8 @@
         "react"
       ],
       "plugins": [
-        "transform-class-properties"
+        "transform-class-properties",
+        "lodash"
       ]
     },
     "umd": {
@@ -25,7 +26,8 @@
         "react"
       ],
       "plugins": [
-        "transform-class-properties"
+        "transform-class-properties",
+        "lodash"
       ]
     }
   }

commonjs/MyComponent.js

@@ -61,6 +61,7 @@
     "babel-eslint": "^7.2.3",
     "babel-jest": "^20.0.3",
     "babel-loader": "^7.0.0",
+    "babel-plugin-lodash": "^3.2.11",
     "babel-plugin-transform-class-properties": "^6.24.1",
     "babel-polyfill": "^6.23.0",
     "babel-preset-env": "^1.5.2",
@@ -82,6 +83,7 @@
     "in-publish": "^2.0.0",
     "jest": "^20.0.4",
     "lint-staged": "^4.0.0",
+    "lodash-webpack-plugin": "^0.11.4",
     "prettier": "^1.4.4",
     "prettier-eslint": "^6.3.0",
     "prettier-eslint-cli": "^4.1.1",

commonjs/goodbyeWorld.js

@@ -1,11 +1,13 @@
 import { resolve as resolvePath } from 'path'
 import webpack from 'webpack'
 import appRootDir from 'app-root-dir'
+import LodashModuleReplacementPlugin from 'lodash-webpack-plugin'
 import { getPackageJson, removeEmpty, ifElse } from '../utils'
 
 function webpackConfigFactory({ target }) {
   const libraryName = getPackageJson().name
   const minimize = target === 'umd-min'
+  const env = process.env.NODE_ENV
 
   return {
     entry: {
@@ -32,6 +34,18 @@ function webpackConfigFactory({ target }) {
         commonjs: 'react-dom',
         commonjs2: 'react-dom',
       },
+      'prop-types': {
+        root: 'PropTypes',
+        amd: 'prop-types',
+        commonjs: 'prop-types',
+        commonjs2: 'prop-types',
+      },
+      'react-sizeme': {
+        root: 'SizeMe',
+        commonjs2: 'react-sizeme',
+        commonjs: 'react-sizeme',
+        amd: 'react-sizeme',
+      },
     },
     plugins: removeEmpty([
       new webpack.DefinePlugin({
@@ -57,6 +71,7 @@ function webpackConfigFactory({ target }) {
           },
         }),
       ),
+      ifElse(env === 'production')(new LodashModuleReplacementPlugin()),
     ]),
     module: {
       rules: [