karma-typescript: Invalid syntax in bundle: 'import' and 'export' may only appear at the top level

After upgrading some dependent modules, I got:

[Error: Invalid syntax in bundle: 'import' and 'export' may only appear at the top level (79532:186) in /var/folders/zk/6bvt6fls7g97ry69c8jykn_h0000gn/T/karma-typescript-bundle-62976QkhHVRO4DC9R.js]
Error: Invalid syntax in bundle: 'import' and 'export' may only appear at the top level (79532:186) in /var/folders/zk/6bvt6fls7g97ry69c8jykn_h0000gn/T/karma-typescript-bundle-62976QkhHVRO4DC9R.js
    at writeBundleFile (.../node_modules/karma-typescript/lib/bundler.js:171:23)
    at flushQueue (.../node_modules/karma-typescript/lib/bundler.js:99:9)
    at bundleQueuedModules (.../node_modules/karma-typescript/lib/bundler.js:94:9)
    at invokeFunc (.../node_modules/lodash.debounce/index.js:160:19)
    at trailingEdge (.../node_modules/lodash.debounce/index.js:207:14)
    at timerExpired [as _onTimeout] (.../node_modules/lodash.debounce/index.js:195:14)
    at Timer.listOnTimeout (timers.js:92:15)

The solution was to:

• npm install karma-typescript@beta (I am using now 3.0.0-beta.2)
• npm install karma-typescript-es6-transform@latest (I am using 1.0.0-beta.6)
• add to karmaTypescriptConfig:
  

  bundlerOptions: {
    transforms: [
      require("karma-typescript-es6-transform")()
    ]
  }
  

For details see How to use es6 library.