argv 6 cli 6 flags 6 process argv 5 parsing options 5 parsing flags 5 parsing cli 5 parsing 5 parser 5 optparse 5 opt parser 5 minimal 5 flags parser 5 cross-platform 5 commandline 5 100lines 5 arg 5 arg parser 5 arg-parse 5 argparse 5 argparser 5 argument 5 argument parser 5 arguments 5 cli options 5 cli parser 5 command options 5 command-line 5 jest 4 libraries 4 modern 4 monorepo 4 opensource 4 parse-commit-message 4 quality 4 testing 4 typescript 4 utilities 4 javascript 4 git 4 freesoftware 4 eslint-config 4 eslint 4 conventional-commits 4 babel-preset 4 babel 4 automation 4 flag 1