Error when adding method to class

[ismaelaarab10]

When i add method like this

    test() {
        console.log("test");
    }

i get a error

ERROR in ./client/authentication/authentication.controller.js Module not found: Error: Cannot resolve module '6to5-runtime/helpers' in C:\wamp\www\app\client\authentication @ ./client/authentication/authentication.controller.js 3:18-49

i use webpack with 6to5-loader

[sebmck]

Remove optional=selfContained from your webpack config.