next.js/test/fixtures/basic/pages/async-props.js

import React from 'react'

export default class AsyncProps extends React.Component {
  static async getInitialProps () {
    return await AsyncProps.fetchData()
  }

  static fetchData () {
    const p = new Promise(resolve => {
      setTimeout(() => resolve({ name: 'Diego Milito' }), 10)
    })
    return p
  }

  render () {
    return <p>{this.props.name}</p>
  }
}