str({ devDefault: undefined }) generates an incorrect type

[denis-sokolov]

str({ devDefault: undefined }) is intended to return undefined in development, based on this existing test:

envalid/tests/basics.test.ts

Lines 53 to 59 in 53f54e9

	const env = cleanEnv(
	{ NODE_ENV: 'test' },
	{
	FOO: str({ devDefault: undefined }),
	},
	)
	expect(env).toEqual({ FOO: undefined })

However, the type of the resulting value is reported as string instead of string | undefined.

[jsamr]

^ Probably caused by #194, will take a look

[af]

Should be fixed in 8.0.0-beta.1, please re-open otherwise!