Adding prices to magento swatches

• Create argento-custom.js

• Add following javascript code there

  
  define([
      'jquery',
      'underscore',
      'priceUtils',
      'domReady!'
  ], function($, _, priceUtils) {
  
      function addPricesToOptions() {
          if (!$('[data-role=swatch-options]').first().data('mageSwatchRenderer')) {
              return setTimeout(addPricesToOptions, 500);
          }
  
          var config = $('[data-role=swatch-options]').first()
                  .data('mageSwatchRenderer').options.jsonConfig;
  
          $('.swatch-attribute').each(function () {
              var attributeId = $(this).data('attribute-id');
              $('.swatch-option', this).each(function () {
                  var optiondId = $(this).data('option-id');
                  var index = _.findKey(config.index, function(value) {
                      return value[attributeId] == optiondId;
                  });
                  this.innerHTML += ' <span class="price">' +
                      priceUtils.formatPrice(
                          config.optionPrices[index].finalPrice.amount,
                          config.priceFormat
                      ) +
                      '</span>';
              });
          });
      }
  
      if ($('[data-role=swatch-options]').length) {
          addPricesToOptions();
      }
  });
  
  
  

• Make static content redeploy:

  php bin/magento setup:static-content:deploy