Bool parses given environment variables as a boolean, or returns the default if the environment variable is empty/unset.

Duration parses given environment variable as a time.Duration, or returns the default if the environment variable is empty/unset.

Get retrieves the value of the environment variable named by the key.

Int parses given environment variable as an int, or returns the default if the environment variable is empty/unset.

URL parses given environment variable as a URL, or returns the default if the environment variable is empty/unset.