wp_scripts_get_suffix()

wp_scripts_get_suffix( string $type = '' ): string

function wp_scripts_get_suffix( $type = '' ) {
	static $suffixes;

	if ( null === $suffixes ) {
		/*
		 * Include an unmodified $wp_version.
		 *
		 * Note: wp_get_wp_version() is not used here, as this file can be included
		 * via wp-admin/load-scripts.php or wp-admin/load-styles.php, in which case
		 * wp-includes/functions.php is not loaded.
		 */
		require ABSPATH . WPINC . '/version.php';

		/*
		 * Note: str_contains() is not used here, as this file can be included
		 * via wp-admin/load-scripts.php or wp-admin/load-styles.php, in which case
		 * the polyfills from wp-includes/compat.php are not loaded.
		 */
		$develop_src = false !== strpos( $wp_version, '-src' );

		if ( ! defined( 'SCRIPT_DEBUG' ) ) {
			define( 'SCRIPT_DEBUG', $develop_src );
		}
		$suffix     = SCRIPT_DEBUG ? '' : '.min';
		$dev_suffix = $develop_src ? '' : '.min';

		$suffixes = array(
			'suffix'     => $suffix,
			'dev_suffix' => $dev_suffix,
		);
	}

	if ( 'dev' === $type ) {
		return $suffixes['dev_suffix'];
	}

	return $suffixes['suffix'];
}