Compiler throwing error "Cannot assign to 'calendarFormat' because it is a read-only property"

[HARIKSREEE]

Describe the bug
While setting the moment.calendarFormat function, typescript compiler throwing "error TS2540: Cannot assign to 'calendarFormat' because it is a read-only property."

Code used
moment.calendarFormat = function(myMoment) { const diff = myMoment.diff(moment(Date()), 'minutes', true) * -1; const retVal = diff < 30 ? 'now' : diff < 1440 ? 'sameDay' : diff < 2880 ? 'lastDay' : 'sameElse'; return retVal; };

Expected behavior
The compiler should not throw any error while assigning the function

Environment
typescript: 3.5.3
moment: 2.24.0

*Locale used
en-gb

Tue Jan 14 2020 20:37:32 GMT+0530 (India Standard Time)
1/14/2020, 8:37:53 PM
-330
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/79.0.3945.117 Safari/537.36

[Alanscut]

@HARIKSREEE See issue #5444 . You can try the following code.

import * as moment from 'moment';
moment.default.calendarFormat = function (myMoment: any, now: any): string {
   return ''
}

or

import moment from 'moment';
moment.calendarFormat = function (myMoment: any, now: any): string {
   return ''
}

[marwahaha]

Please re-open if you still have issues.