discourse/app/assets/javascripts/discourse-common/helpers/fa-icon.js.es6

import { registerUnbound } from 'discourse-common/lib/helpers';
import { renderIcon } from 'discourse-common/lib/icon-library';
import deprecated from 'discourse-common/lib/deprecated';

export function iconHTML(id, params) {
  return renderIcon('string', id, params);
}

registerUnbound('fa-icon', function(icon, params) {
  deprecated("Use `{{d-icon}}` instead of `{{fa-icon}}");
  return new Handlebars.SafeString(iconHTML(icon, params));
});