`export` for core

Export definitions or environment variables from a module.

Signature

> export {flags}

input	output
nothing	nothing

Export a definition from a module.

> module utils { export def my-command [] { "hello" } }; use utils my-command; my-command
hello

This command is a parser keyword. For details, check: https://www.nushell.sh/book/thinking_in_nu.html

name	description	type
`export alias`	Alias a command (with optional flags) to a new name and export it from a module.	keyword
`export const`	Use parse-time constant from a module and export them from this module.	keyword
`export def`	Define a custom command and export it from a module.	keyword
`export extern`	Define an extern and export it from a module.	keyword
`export module`	Export a custom module from a module.	keyword
`export use`	Use definitions from a module and export them from this module.	keyword