Merge pull request #932 from Microsoft/jwilaby/build-optimization

Jwilaby/build optimization

.babelrc

@@ -16,6 +16,7 @@
   "sourceMaps": "inline",
   "plugins": [
     "@babel/plugin-proposal-class-properties",
-    "@babel/plugin-transform-react-jsx"
+    "@babel/plugin-transform-react-jsx",
+    "@babel/plugin-transform-runtime"
   ]
 }

babel-jest-config.js

@@ -1,11 +1,14 @@
 const fs = require('fs-extra');
+const path = require('path');
 
-const babelOptions = fs.readJsonSync('.babelrc');
+const babelOptions = fs.readJsonSync(path.join(__dirname, '.babelrc'));
 const transformer = require('babel-jest');
 
 const { createTransformer } = transformer;
 const thisTransformer = createTransformer(babelOptions);
 
 Object.assign(transformer, thisTransformer);
-transformer.createTransformer = () => thisTransformer;
+transformer.createTransformer = () => {
+  return thisTransformer
+};
 module.exports = transformer;