/**
 * Build Apple Mail `message:` deep-link URLs from RFC 5322 Message-IDs.
 *
 * Mail.app resolves `message://%3C<message-id>%3E` to the matching message in
 * any configured account, independent of which mailbox it currently lives in.
 * The angle brackets are required and must be percent-encoded; the ID itself
 * only needs encoding for characters that would break URL parsing.
 */
/**
 * Convert a Message-ID (with or without surrounding angle brackets) into a
 * `message://` URL, or `undefined` when no usable ID is present.
 */
export declare function buildMessageUrl(messageId: string | undefined): string | undefined;
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