--- /dev/null
+'use strict';
+module.exports = (flag, argv) => {
+ argv = argv || process.argv;
+ const prefix = flag.startsWith('-') ? '' : (flag.length === 1 ? '-' : '--');
+ const pos = argv.indexOf(prefix + flag);
+ const terminatorPos = argv.indexOf('--');
+ return pos !== -1 && (terminatorPos === -1 ? true : pos < terminatorPos);
+};