How can initialize Fancybox into WordPress with a separate .js file properly?

I did a search and found this method here using wp_add_inline_script. And it works.

But what if I wanted to keep my initialization script into an other .js file? That’s what I wanted at first. How I can I load correctly? I tried this but the loading of my init-fancybox must be too early because I get an error.

(my init-fancybox script is not the problem because it works when it is loaded correctly using wp_add_inline_script)

function fancybox_enqueues() { 

    wp_register_script( 'fancybox', get_theme_file_uri( '/assets/js/jquery.fancybox.min.js' ), array('jquery'), '3.5.7', true);
    wp_register_script( 'init-fancybox', get_theme_file_uri( '/assets/js/init-fancybox.js' ), array('jquery','fancybox'), '1.0', true);
    wp_register_style( 'fancybox-css', get_theme_file_uri( '/css/jquery.fancybox.min.css' ), '1.0');

    if ( is_singular( 'item' ) ) {
        wp_enqueue_script( 'jquery');
        wp_enqueue_script( 'fancybox' );
        wp_enqueue_script ('init-fancybox');
        wp_enqueue_style( 'fancybox-css' );
    }
}
add_action( 'wp_enqueue_scripts', 'fancybox_enqueues');

Here is the error I get TypeError: $ is not a function

And here is the init-fancybox.js

$('[data-fancybox="single-item__gallery"]').fancybox({
    buttons : [ 
        "zoom",
        "share",
        //"slideShow",
        "fullScreen",
        //"download",
        "thumbs",
        "close"
    ],
    thumbs : {
      autoStart : false
    }
  });

Answer

It seems jQuery is not loaded by the time your code is running. Try adding the following function around it to make sure jQuery exists before your code runs:

jQuery(document).ready(function ($) {

  // Your function goes here:
  $('[data-fancybox="single-item__gallery"]').fancybox({
    buttons: [
      "zoom",
      "share",
      //"slideShow",
      "fullScreen",
      //"download",
      "thumbs",
      "close"
    ],
    thumbs: {
      autoStart: false
    }
  });

});

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Answer