twentynineteen_custom_colors_lightness │ filter-hook │ WC 1.0

Usage

add_filter( 'twentynineteen_custom_colors_lightness', 'wp_kama_twentynineteen_custom_colors_lightness_filter' );

/**
 * Function for `twentynineteen_custom_colors_lightness` filter-hook.
 * 
 * @param  $33 
 *
 * @return 
 */
function wp_kama_twentynineteen_custom_colors_lightness_filter( $33 ){

	// filter...
	return $33;
}

$33

-

Where the hook is called

$lightness = absint( apply_filters( 'twentynineteen_custom_colors_lightness', 33 ) );

Where the hook is used in WooCommerce