Clerk.js allows you to write custom javascript functions, that adds new functionality to the Designs.

TemplateFormatters should be inserted as a configuration for Clerk.js, in the tracking-script that is inserted on all pages.

For Magento 2, this file contains the tracking-script:

vendor->view->frontend->templates->tracking.phtml

An example can be seen below:

<script type="text/javascript">
    window.clerkAsyncInit = function() {
        Clerk.config({
            key: '<?php echo $block->escapeJsQuote($block->getPublicKey()); ?>',
            collect_email: <?php echo $block->getCollectionEmails(); ?>,
            templateFormatters: {
  log_price: function(price) {
     console.log(price);
  }
        });
    };
    require(['clerk'], function() {});
</script>

You can write any number of TemplateFormatters, separated by comma:

templateFormatters: {
   log_price: function(price) {
      console.log(price);
   },
   calculate_discount: function(price,special_price) {
      return price-special_price;
   },
   substring: function(text) {
      var short_string = text.substring(0,20);
      return short_string;
   }          
}

After creating your TemplateFormatters, you can use them in your Designs using this syntax:

{{ substring name }} {{ calculate_discount price special_price }}

This allows you to create any functionality in your Designs that you require.

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