protected static function loadMimeAliases($aliasesFile)
    {
        if ($aliasesFile === null) {
            $aliasesFile = static::$mimeAliasesFile;
        }
        $aliasesFile = \Reaction::$app->getAlias($aliasesFile);
        if (!isset(self::$_mimeAliases[$aliasesFile])) {
            self::$_mimeAliases[$aliasesFile] = require $aliasesFile;
        }

        return self::$_mimeAliases[$aliasesFile];
    }