How to use moment-duration-format in TypeScript?

问题:

I am using moment.js in my TypeScript (Ionic2/Angular2) project. Following on from this post, I now want to try out a plugin moment-duration-format

I have the npm package and the type definition and am able to use by import as..

import moment from 'moment';
...
let duration = moment.duration(decimalHours, 'hours');

I now want to use moment-duration-format

I have installed via npm install moment-duration-format --save and then the type definition via npm i @types/moment-duration-format --save.

I can see both npm modules.

As always, there is always some mystery on how to use such type definitions (the useage including import never seems to be in any doco).

I have tried adding import 'moment-duration-format';, import duration from 'moment-duration-format'; (moment-duration-format/index.d.ts' is not a module.)

I get an error when trying to use as follows..

let dd = moment.duration.format(400.99, 'hours').format('D:HH:mm');

// (TS error [ts] Property 'format' does not exist on type '(inp?: DurationInputArg1, unit?: DurationConstructor) => Duration'.

Does anyone have any idea on how to use this in TypeScript.

Thanks in advance

回答1:

I was using the workaround here, but it now looks like the ype def has been fixed. Getting an update of the type def So I can do the following...

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

let duration = moment.duration(decimalHours, 'hours') ;   
let options : moment.DurationFormatSettings   = {
  forceLength : false,
  precision : 0,
  template : formatString,
  trim : false
};
let result  = duration.format(formatString, 0, options);

回答2:

You are using duration as a property instead of invoking it. Try:

let dd = moment.duration(400.99, 'hours').format('D:HH:mm');

This is actually not a TypeScript problem. It wouldn't work with JavaScript either. In JavaSctript you would get a runtime error while TypeScript doesn't let you do it at compile time (proving its worth).

回答3:

I'm having the same problem...

It seems as if there is an error in the type definition. Others have same issue as you can see here: https://github.com/souldreamer/noti-cli/blob/ef104c22792e0dfeb67d3372b04e231d45ffaa55/src/shared/pipes.ts#L38

There was a fix for the problem as part of a pull request on github, that unfortunately has been closed without merging: https://github.com/DefinitelyTyped/DefinitelyTyped/pull/14327

As a temporary workaround, you could use the line of code of the first link. As second step we should try to create a new pull request on github, to get the problem fixed in future releases.

回答4:

The problem is as R_B_ correctly worked out a wrong type definition in the typings module for moment-duration-format.

I'll create a new pull request for this, as my last was closed because of lint errors.

So long you can use a custom type definition in your project as done here https://github.com/TwoStone/leaderboard/blob/develop/subprojects/webapp/src/custom-typings.d.ts Just create the file in your project and it should work for the moment.