Can I use it locally? Without CDN?

Now it is possible to load the library locally in the development version of the 3.0.x branch.

Add the following entry in the "repositories" section of your main composer.json file.

    {
        "type": "package",
        "package": {
            "name": "flatpickr/flatpickr",
            "version": "4.6.13",
            "type": "drupal-library",
            "dist": {
                "url": "https://registry.npmjs.org/flatpickr/-/flatpickr-4.6.13.tgz",
                "type": "tar"
            }
        }
    },

Now you can run the following command to install flatpickr in the right folder:

composer require flatpickr/flatpickr:4.6.13

Automatically closed - issue fixed for 2 weeks with no activity.