Webpack and TypeScript: Implementing Moment.js Plugins

I am looking to integrate the JDateFormatParser plugin with Moment.js in my Angular 4 application.

Successfully installed and implemented Moment.js using:
npm install moment --save

Imported it into my .ts file:

import * as moment from 'moment';

Everything is working as expected.

Next, I added the JDateFormatParser plugin by running:

npm install moment-jdateformatparser --save

When trying to use it in my code:

moment().toJDFString(moment.localeData().longDateFormat('L'))

My IDE showed an error message:

TS2339:Property 'toJDFString' does not exist on type 'Moment'.

Referring to this answer, I attempted to fix it using casting:

(<any>moment()).toJDFString(moment.localeData().longDateFormat('L'))

The IDE error was resolved, but now the console displays:

TypeError: WEBPACK_IMPORTED_MODULE_6_moment(...).toJDFString is not a function

Any suggestions on how to properly utilize this?

angulartypescriptwebpackmomentjs

Answer №1

When working with the moment-jdateformatparser library, it is necessary to import it in order to add its functions to moment and export moment.

import * as moment from "moment-jdateformatparser";

If you need to use multiple plugins, there isn't a straightforward solution at the moment. One approach could be importing each plugin separately and assigning them different names:

import * as momentJdate from "moment-jdateformatparser";
import * as momentTimezone from "moment-timezone";

You can then merge them using deepExtend if desired:

let moment = {};
deepExtend(moment, momentJdate, momentTimezone);

// You can now use moment().toJDFString() and moment.tz.names()

While these methods may not be ideal, they should work effectively. Personally, I haven't encountered a situation where I needed to use more than one moment plugin in a single file, so this workaround should suffice.

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