x = basename( $file );
			$l      = strlen( $domain );
			if ( substr( $suffix, 0, $l ) !== $domain || '-' !== $suffix[ $l ] ) {
				return $file;
			}
			$suffix   = substr( $suffix, $l );
			$lang_dir = Jetpack_Constants::get_constant( 'WP_LANG_DIR' );

			// Look for replacement files.
			list( $newdomain, $type ) = self::$domain_map[ $domain ];
			$newfile                  = $lang_dir . ( 'core' === $type ? '/' : "/{$type}/" ) . $newdomain . $suffix;
			if ( is_readable( $newfile ) ) {
				return $newfile;
			}
		}
		return $file;
	}

	// endregion .
}

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// .