npm-init

npm init <initializer> can be used to set up a new or existing npm package.
initializer in this case is an npm package named create-<initializer>, which will be installed by npx, and then have its main bin executed -- presumably creating or updating package.json and running any other initialization-related operations.
(from npm documentation)

npx

Executes <command> either from a local node_modules/.bin, or from a central cache, installing any packages needed in order for <command> to run.

npx will install a package, if needed, then will run its CLI.

We should support npx commands, such as here: https://stackoverflow.com/a/59189242/839513.

Note that in contrast to the regular npm command, in npx will be just one package. The other arguments will be the package's CLI arguments.