Typescript and MomentJS integration - What is the data type of the moment() function?

Currently in the process of upgrading my project from ES5 to ES6, I've encountered a problem with MomentJS (version 2.18.1). The issue arises when dealing with variables that are Moment objects and the inability to call moment() on them.

For instance:

import * as moment from "moment";

export class DateThingy {

  constructor(private moment) { //What type does this have??
  }

  public getDate(): moment.Moment { 
    return this.moment();
  }
}

1) Setting the type of private moment to private moment: moment causes WebStorm to display an error: "cannot find name 'moment'."

2) Assigning the type as private moment: moment.Moment results in an object change where calling this.moment() is no longer possible. Webstorm indicates: "cannot invoke an expression whose type lacks a call signature. Type 'Moment' has no compatible call signatures."

3) Due to MomentStatic not being exported, using 

private moment: moment.MomentStatic
prompts WebStorm to show: "namespace 'moment' does not have an exported member 'MomentStatic'"

Therefore, what kind of typing should be used in this scenario?

typescriptmomentjs

Answer №1

In reference to Jane Doe's explanation, it was mentioned that the moment object is no longer able to be injected in the constructor. Previously, this feature was possible with an outdated version of MomentJS. To resolve this issue, one can eliminate the constructor property and instead access the global moment object through import * as moment from "moment".

The method moment() will yield a Moment object, which can be specified as moment.Moment.

Therefore, the code may be adjusted as shown below:

import * as moment from "moment";

export class DateThingy {

     constructor() {
     }

     public getDate(): moment.Moment { 
        return moment();
     }
}

Answer №2

To incorporate moment typing into your code, you can follow these steps:

import moment, { Moment } from "moment";

const currentTime: Moment = moment();

Answer №3

Have you attempted to import moment without using an alias?

import moment from 'moment';

I found success with this method. Additionally, the typescript compiler should not raise any complaints.

const date =  moment().format('YYYYMMDD');

Keep in mind that updating the tsconfig file is necessary!

In your TSConfig file, be sure to include the allowSyntheticDefaultImports option to allow default imports of libraries that do not have default exports.

For example (tsconfig.json): 

{
  "compileOnSave": false,
  "compilerOptions": {
    "allowSyntheticDefaultImports": true,
  }
}

Answer №4

I encountered an error message that said:

Cannot invoke an expression whose type lacks a call signature. Type 'typeof moment' has no compatible call signatures.

The issue stemmed from importing with an alias

import * as momentns from 'moment';

To resolve this, I made the change to

import moment from 'moment';

This fix worked for me in Angular 8 (TypeScript 2.4)

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