Suggestion : remove "boolean" package dependency

[guiled]

The "boolean" dependency is quite light, but is also absolutely overkill. It is only used in one line, just to check that a env config matches some string values.
I think it took more time to search for and include this package than code the desire behaviour.

[silverwind]

The boolean package has been deprecated:

https://www.npmjs.com/package/boolean

Package no longer supported. Contact Support at https://www.npmjs.com/support for more info.