Dotenv running on debug mode for any non-undefined debug option

[n8eloy]

Hey all! We have noticed that passing any defined values in the debug option in config function will turn on debug mode.

e.g. all those will activate debug logs:

dotenv.config({ debug: true })
dotenv.config({ debug: false })
dotenv.config({ debug: 'foo' })
dotenv.config({ debug: 0 })
dotenv.config({ debug: {} })

The documentation mentions that debug defaults as false, but I didn't expect that passing false explicitly wouldn't make it work the same way.

What I'm exactly trying to accomplish is programmatically activate debug mode for a certain environment variable:

dotenv.config({ debug: process.env.NODE_ENV === 'development' })

The only way I've made it work was by passing an undefined or null value:

dotenv.config({ debug: process.env.NODE_ENV === 'development' ? true : undefined })

I do think this happens because options.debug is checked against null, but not against falsy values. Is this expected behavior?

dotenv/lib/main.js

Lines 83 to 97 in 27dfd3f

	let dotenvPath = path.resolve(process.cwd(), '.env')
	let encoding /*: string */ = 'utf8'
	let debug = false
	if (options) {
	if (options.path != null) {
	dotenvPath = resolveHome(options.path)
	}
	if (options.encoding != null) {
	encoding = options.encoding
	}
	if (options.debug != null) {
	debug = true
	}
	}

I'm using Dotenv version 8.6.0

[nifr]

This issue is still present in 10.0.0.

@motdotla - Can I help somehow to get #550 merged and a new release tagged?