Enqueue Typekit fonts for better local development.

typekit.php

/**
 * Enqueue Typekit fonts for local development.
 *
 * @action wp_head
 * @return string
 */
function themeslug_local_fonts() {
	if ( 'http://themeslug.dev' === site_url() ):
		$kit = '#######';
		?>
		<script>
		    // try{!function(t,e,n,r,a,s,i,l)
		</script>
		<script>
		(function(d) {
		var config = {
			kitId: '<?php echo $kit; ?>',
			scriptTimeout: 3000
		},
		h=d.documentElement,t=setTimeout(function(){h.className=h.className.replace(/\bwf-loading\b/g,"")+" wf-inactive";},config.scriptTimeout),tk=d.createElement("script"),f=false,s=d.getElementsByTagName("script")[0],a;h.className+=" wf-loading";tk.src='https://use.typekit.net/'+config.kitId+'.js';tk.async=true;tk.onload=tk.onreadystatechange=function(){a=this.readyState;if(f||a&&a!="complete"&&a!="loaded")return;f=true;clearTimeout(t);try{Typekit.load(config)}catch(e){}};s.parentNode.insertBefore(tk,s)
		})(document);
		</script>
		<?php
	endif;
}
add_action( 'wp_head', 'themeslug_local_fonts', 20 );