Optionalpaths?: string | string[]Dotenv search paths as a space‑delimited string or a pre‑split string[].
Optionalvars?: string | Record<string, string | undefined>Extra variables as either a space‑delimited string of assignments
(e.g., "FOO=1 BAR=2") or an object map of string | undefined values.
Compatibility shape for root options allowing string inputs for vars/paths. Used during CLI argument parsing before normalization.