vue.js

// export iife 

    export default (() => {
        const options = {
            name   : 'UserList',
            data,
            methods: {
                getUsers
            }
        }

        return options

        function data () {
            return { users: [] }
        }

        function getUsers () {
            return axios.get('someUrl')
                    .then((resp)=> {
                        this.users = resp.data
                    })
        }
    })()

// vs export options obj no iife

        const options = {
            name   : 'UserList',
            data,
            methods: {
                getUsers
            }
        }

        function data () {
            return { users: [] }
        }

        function getUsers () {
            return axios.get('someUrl')
                    .then((resp)=> {
                        this.users = resp.data
                    })
        }

        export {options as default}

        // vs format in docs:

        export default {
            name   : 'UserList',
            data () {
            return { users: [] }
            },
            methods: {
                getUsers () {
                    return axios.get('someUrl')
                      .then((resp)=> {
                          this.users = resp.data
                      })
                }
            }
        }