Stop Babel requiring entire package.json just to get core version num…

…ber. Reduces build size by ~3 KB

gulpfile.js

@@ -38,13 +38,18 @@ function webpackBuild(filename, libraryName, version) {
     plugins: [
       new webpack.DefinePlugin({
         'process.env.NODE_ENV': '"production"',
+        BABEL_VERSION: JSON.stringify(require('babel-core/package.json').version),
         VERSION: JSON.stringify(version),
       }),
       // Use browser version of visionmedia-debug
       new webpack.NormalModuleReplacementPlugin(
         /debug\/node/,
         'debug/browser'
       ),
+      new webpack.NormalModuleReplacementPlugin(
+        /..\/..\/package/,
+        '../../../../src/babel-package-shim'
+      ),
       new webpack.optimize.OccurenceOrderPlugin(),
       new webpack.optimize.DedupePlugin()
     ]

src/babel-package-shim.js

@@ -0,0 +1,5 @@
+/**
+ * A shim that replaces Babel's require('package.json') statement.
+ * Babel requires the entire package.json file just to get the version number.
+ */
+export const version = BABEL_VERSION;