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ANSI Colored Logger in 50 Lines
chalk is great. chalk plus chalk-template plus log-symbols plus signal-exit is heavy. Here is the dependency-free ANSI logger I drop into every Node script when I want one-line wins without 14 transitive packages.
An argv Parser Without yargs or commander
Eighty percent of the time I just need --flag and --opt=value parsing for a one-off script. Adding yargs feels heavy. This is the 30-line zero-dependency parser I copy into every Node script.
Prompt for y/N Without readline Cruft
Every CLI script needs a confirm() one day. The full Inquirer ceremony is overkill. Here is the small wrapper I copy into deploy scripts when I need 'are you sure? [y/N]' that defaults to no.
A stdout Progress Bar Without a Library (Python)
tqdm is wonderful but adds 30k of dependencies for a 30-line job. Here is the pure-stdlib progress bar I drop into ETL scripts when I just want to know how far through the file I am.
CSV With Quoted Commas: The 30-Line Parser
split(',') gets you fired on the first row that contains a comma inside quotes. Here is a state-machine CSV parser in 30 lines that handles quoted commas, escaped quotes, and CRLF endings.