update ts-loader options

implements solution from github.com/cypress-io/cypress/issues/2316

Signed-off-by: Brenna Hewer-Darroch <brenna@chef.io>

Author: Brenna Hewer-Darroch

e2e/cypress/plugins/cy-ts-preprocessor.js

@@ -14,7 +14,10 @@ const webpackOptions = {
         exclude: [/node_modules/],
         use: [
           {
-            loader: 'ts-loader'
+            loader: 'ts-loader',
+            options: {
+              transpileOnly: true
+            }
           }
         ]
       }