moment-duration-format.d.ts Definition Not Extending Moment Module

Question

Any idea why this doesn’t work or how I can extend the duration interface to support the format function?

declare module \'moment\' {
     interface Duration         


        

Answer 1

Imports:

import * as moment from 'moment';
import 'moment-duration-format';

Outside of your class, define the interfaces:

interface Duration extends moment.Duration {
  format: (template?: string, precision?: number, settings?: DurationSettings) => string;
}

interface DurationSettings {
  forceLength: boolean;
  precision: number;
  template: string;
  trim: boolean | 'left' | 'right';
}

Then in your code:

const duration = moment.duration(minutes, 'minutes') as Duration;
return duration.format('mm');

If you defined your Duration interface in another file, you will need to export and import it as well.