JS:Lint错误:意外标记=

我得到一个标准的js lint错误

/lib/with-apollo-client.js:7:24: Parsing error: Unexpected token =

对于这个片段,它来自 https://github.com/zeit/next.js/blob/canary/examples/with-apollo/lib/with-apollo-client.js

import initApollo from './init-apollo'
import Head from 'next/head'
import { getDataFromTree } from 'react-apollo'

export default (App) => {
  return class Apollo extends React.Component {
    static displayName = 'withApollo(App)' // <-
    static async getInitialProps (ctx) {
    // ...
    }
  }
}