Fix jest failing on transpilation

Author: marvinhagemeister

babel.config.js

@@ -4,6 +4,7 @@ module.exports = {
 			'@babel/preset-env',
 			{
 				loose: true,
+				modules: process.env.BABEL_ENV === 'test' ? 'commonjs' : 'auto',
 				targets: {
 					node: 'current',
 				},

package.json

@@ -12,7 +12,7 @@
     "prepare": "npm run -s build",
     "prepare:babel": "babel src/*.js -d dist && npm t",
     "lint": "eslint src",
-    "test": "npm run -s lint && npm run -s build && jest",
+    "test": "npm run -s lint && npm run -s build && BABEL_ENV=test jest",
     "release": "npm run -s prepare && npm test && git commit -am $npm_package_version && git tag $npm_package_version && git push && git push --tags && npm publish"
   },
   "repository": "developit/microbundle",