/**
 * Names and credentials as they go on the IMAP wire.
 *
 * Both problems here are the same problem: IMAP's wire format is 7-bit and
 * quoted, and a value that is not encoded for it either breaks the command or
 *, worse, extends it. A password with a newline in it would add a line the
 * server reads as a command; a Drafts folder called `Entwurfe` with an umlaut
 * cannot be written at all without modified UTF-7. Split out of
 * `imap-client.ts` to keep that file under the repository's per-file line cap.
 */
/**
 * Reject credentials containing CR or LF, these cannot be safely represented
 * in any IMAP quoted-string or literal.
 * Then return the credential as an RFC 3501 quoted string:
 *   - backslashes escaped as \\\\
 *   - double-quotes escaped as \\"
 * If the result would contain characters outside of printable US-ASCII
 * (which quoted strings cannot hold per RFC 3501), throw a plain-language error.
 */
export declare function imapQuoteCredential(value: string, name: string): string;
/** The mailbox read when none is configured. */
export declare const DEFAULT_MAILBOX = "INBOX";
/**
 * Mailbox names that are plain atoms go on the wire bare; anything else is
 * sent as an RFC 3501 quoted string so spaces and delimiters stay intact.
 * Non-ASCII names are encoded first, see `toModifiedUtf7`.
 */
export declare function formatMailboxName(mailbox: string): string;
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