woocommerce_email_renderer_styles │ filter-hook │ WC 1.0

Usage

add_filter( 'woocommerce_email_renderer_styles', 'wp_kama_woocommerce_email_renderer_styles_filter', 10, 2 );

/**
 * Function for `woocommerce_email_renderer_styles` filter-hook.
 * 
 * @param  $template_styles 
 * @param  $post            
 *
 * @return 
 */
function wp_kama_woocommerce_email_renderer_styles_filter( $template_styles, $post ){

	// filter...
	return $template_styles;
}

$template_styles

-

$post

-

Where the hook is called

$template_styles  = wp_strip_all_tags( (string) apply_filters( 'woocommerce_email_renderer_styles', $template_styles, $post ) );

Where the hook is used in WooCommerce