[2202] Component data's function called twice

Hello all.

Can you help me please ? The data function is called twice when I refresh the page.

Thanks

package.json ... "nuxt": "^1.0.0-rc11", ...

file index.vue

import Functions from '~/utils/Functions'

  export default {
    name: 'Testing',
    components: {},
    data: () => {
      return {
        test: Functions.test()
      }
    },
    methods: {},
    mounted () {}
  }

file ~/utils/Functions.js ...

test () {
  console.error('in data function')
}

...

Browser