Uncaught ReferenceError: Modernizr is not defined at timeslots.js

Removing the call for Modernizer reveals more errors

Uncaught TypeError: $context.find(...).once is not a function

line 30: $context.find('input[data-drupal-date-format]').once('datePicker').each(function ()

And

Uncaught TypeError: $(...).find(...).findOnce is not a function

Line:99 $(context).find('input[data-drupal-date-format]').findOnce('datePicker').datepicker('destroy');

Remove jQuery dependency from the once feature →

To Fix: Uncaught ReferenceError: Modernizr is not defined at timeslots.js

Add:

timeslots:
  js:
    js/timeslots.js: {}
  css:
    theme:
      css/timeslots.css: {}
  dependencies:
    - core/jquery
    - core/drupal.date
 +  - core/modernizr
    - jquery_ui_datepicker/datepicker

To: commerce_timeslots.libraries.yml

Clear cache.

This will fix the error but the next error will apper

Uncaught TypeError: $context.find(...).once is not a function

to get rid of

Uncaught TypeError: $context.find(...).once is not a function

change line 30:

$context.find('input[data-drupal-date-format]').once('datePicker').each(function ()

to

$(once('input[data-drupal-date-format]', 'datePicker', context.find)) .each(function () {

This removes the error but it is not fixing the issue. Date picker is not loaded and a user can not select a date.

tried adding - core/once as a dependency but did not work