.d、 ts在TypeScript 2.6.1之后未编译

我使用TypeScript 2.5版本和这个环境模块 suncalc 包裹:

// Note: incomplete
// https://www.npmjs.com/package/suncalc

declare module "suncalc" {
  interface suncalcResult {
    solarNoon: Date;
    nadir: Date;
    sunrise: Date;
    sunset: Date;
    sunriseEnd: Date;
    sunsetStart: Date;
    dawn: Date;
    dusk: Date;
    nauticalDawn: Date;
    nauticalDusk: Date;
    nightEnd: Date;
    night: Date;
    goldenHourEnd: Date;
    goldenHour: Date;
  }

  function sunCalc(date: Date, latitude: number, longitude: number): suncalcResult;

  export = { // COMPLAINING HERE <--------------------------- line 24
    getTimes: sunCalc
  };
}

在TypeScript 2.5中,我得到了一个名为 suncalc.d.ts 编译时没有错误。当我升级到2.6时,它开始责怪:

message: 'The expression of an export assignment must be an identifier or qualified name in an ambient context.'
at: '24,12'
source: 'ts'

然而,在 changelog of TypeScript 环境模块中没有任何变化。

为什么现在不编译?我应该如何在TS2.6中编写导出?