apply_filters( ‘wp_preload_resources’, array $preload_resources )

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   Robert C. 5 months ago

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   This is how you could use the wp_preload_resources filter to preload your theme styles.

   function craftedat_preload_assets( array $preload_resources ): array {
   
   	/**
   	 * Check if stylesheet is loaded.
   	 * 'theme-style' is the WP handle of your stylesheet.
   	 */
   	if ( wp_style_is( 'theme-style' ) ) {
   		$wp_style_theme = wp_styles()->registered['theme-style'];
   
   		// Including the version number is crucial.
   		$path_to_theme_styles = $wp_style_theme->src . '?ver=' . $wp_style_theme->ver;
   
   		$preload_resources[] = array(
   			'href'  => $path_to_theme_styles,
   			'as'    => 'style',
   			'media' => 'all',
   			'type'  => 'text/css',
   		);
   	}
   
   	return $preload_resources;
   }
   
   add_filter( 'wp_preload_resources', 'craftedat_preload_assets' );