# create package.json
npm init -y

# install chalk - use this version for to use require('')
npm i [email protected]

# install jest on version 27.0.6
npm i --save-dev [email protected] 

# install jest intellisense to work on vscode
npm i @types/jest

using FS for read/write in files fs nodejs for create and test string regular expression regex101 node fetch jest shebang SPDX License List package json exemples for lib nodejs #!/usr/bin/env node used to publish your lib