wp-webfont-loader.php

<?php
/**
 * Добавляем свой шрифт в тему асинхронно
 *
 * @link https://github.com/typekit/webfontloader
 */
function mihdan_add_roboto_font() {
	?>
	<script type="text/javascript">
		WebFontConfig = {
			classes: false,
			events: false,
			google: {
				families: [ 'Roboto:400,700:cyrillic&display=swap' ]
			}
		};
		(function( d ) {
			var wf = d.createElement('script'),
				s = d.getElementsByTagName('script')[0];
			wf.src = 'https://ajax.googleapis.com/ajax/libs/webfont/1.6.26/webfont.js';
			wf.async = true;
			s.parentNode.insertBefore(wf, s);
		})( document );
	</script>
	<?php
}
add_action( 'wp_head', 'mihdan_add_roboto_font' );