--- /dev/null
+//
+// Constants
+//
+
+'use strict';
+
+module.exports.EOL = '\n';
+
+module.exports.SUPPRESS = '==SUPPRESS==';
+
+module.exports.OPTIONAL = '?';
+
+module.exports.ZERO_OR_MORE = '*';
+
+module.exports.ONE_OR_MORE = '+';
+
+module.exports.PARSER = 'A...';
+
+module.exports.REMAINDER = '...';
+
+module.exports._UNRECOGNIZED_ARGS_ATTR = '_unrecognized_args';