Error: The method 'replace' is not a valid function for the specified

Something strange happened to my DatePicker today. All of a sudden, when I try to open it, the entire DatePicker appears white and I'm getting this error:

> ERROR Error: Uncaught (in promise): TypeError: format.replace is not a function
TypeError: format.replace is not a function
    at expandFormat (moment.js:543:29)
    at formatMoment (moment.js:527:18)
    at Moment.format (moment.js:3994:22)
    at MomentDateAdapter.format (material-moment-adapter.mjs:126:21)
    at MatDatepickerInput._formatValue (datepicker.mjs:2907:47)
    at MatDatepickerInput._assignValueProgrammatically (datepicker.mjs:2938:14)
    at MatDatepickerInput.writeValue (datepicker.mjs:2846:14)
    at onChange (forms.mjs:3160:27)
    at forms.mjs:3646:50
    at Array.forEach (<anonymous>)
    at resolvePromise (zone.js:1211:31)
    at zone.js:1282:17
    at _ZoneDelegate.invokeTask (zone.js:406:31)
    at Object.onInvokeTask (core.mjs:26218:33)
    at _ZoneDelegate.invokeTask (zone.js:405:60)
    at Zone.runTask (zone.js:178:47)
    at drainMicroTaskQueue (zone.js:585:35)

I've checked my code but I can't seem to find format.replace anywhere in it. The console also indicates that the issue isn't coming from my code. I'm puzzled as to why this error has suddenly appeared.

Here's the HTML code for my DatePicker:

    <input mat-input [matDatepicker]="basicDatepicker" id="invisibleDate" readonly="readonly" [min]="minDate" [max]="maxDate" [(ngModel)]="currentDate">
    <h4 id="datePicker">{{ currentDate | customDate }}</h4>
    <mat-datepicker-toggle [for]="basicDatepicker"></mat-datepicker-toggle>
    <mat-datepicker #basicDatepicker id="datePickerIcon"></mat-datepicker>

This is what my DatePicker looks like

angulartypescripthttpdatepicker

Answer №1

During my testing of React code using testing-library, I came across an error similar to the luxon equivalent.

The error message displayed: "dtf.format(...).replace is not a function
TypeError: dtf.format(...).replace is not a function"

Upon identifying moment.js in the error, it seems that luxon serves as a newer alternative to momentjs.

In our case, the issue revolved around timezones. The failure stemmed from this specific function being called during tests:

DateTime.fromISO(date,
{ zone: timezone, locale: I18n.locale }).toFormat('EEE dd MMM, HH:mm')

To mitigate this, we opted to exclude passing timezones as props to our components in the tests.

If the problem lies in your code implementation, focus on examining timezone-related aspects within your codebase.

Should the issue be linked to a particular package, consider reaching out to them and reporting it as a potential bug on their end.

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