Source

File: wp-includes/load.php

function wp_is_file_mod_allowed( $context ) {
	/**
	 * Filters whether file modifications are allowed.
	 *
	 * @since 4.8.0
	 *
	 * @param bool   $file_mod_allowed Whether file modifications are allowed.
	 * @param string $context          The usage context.
	 */
	return apply_filters( 'file_mod_allowed', ! defined( 'DISALLOW_FILE_MODS' ) || ! DISALLOW_FILE_MODS, $context );
}