import type { EmailAddress, EmailAddressInput } from "./types.mjs";
/**
* Normalize any accepted address input to an array of `EmailAddress` —
* drivers should not re-implement this parsing.
*
* Accepts:
*   - `"ada@acme.com"`
*   - `"Ada Lovelace <ada@acme.com>"`
*   - `{ email, name? }`
*   - arrays of the above (mixed)
*/
export declare function normalizeAddresses(input: EmailAddressInput | undefined): EmailAddress[];
/** Parse `"Name <email@x>"` or a bare `"email@x"` into an `EmailAddress`. */
export declare function parseAddress(value: string): EmailAddress;
/** Format an `EmailAddress` back into its canonical header form. */
export declare function formatAddress(addr: EmailAddress): string;
/** Basic RFC-5322-ish address syntax validator. Strict enough to catch
*  typos but not so strict that it rejects RFC-valid edge cases. */
export declare function isValidEmail(value: string): boolean;