/**
 * Label strategy — provider-aware label operations.
 *
 * Three strategies handle the differences between email providers:
 * - ProtonMail Bridge: Labels are IMAP folders under "Labels/" prefix
 * - Gmail: Uses X-GM-LABELS extension via ImapFlow's useLabels option
 * - Standard IMAP: Uses RFC 5788 keywords (custom flags)
 */
import type { ImapFlow } from 'imapflow';
import type { LabelInfo, LabelStrategyType } from '../types/index.js';
export interface LabelStrategy {
    readonly type: LabelStrategyType;
    listLabels: (client: ImapFlow) => Promise<LabelInfo[]>;
    addLabel: (client: ImapFlow, emailId: string, mailbox: string, label: string) => Promise<void>;
    removeLabel: (client: ImapFlow, emailId: string, mailbox: string, label: string) => Promise<void>;
    createLabel: (client: ImapFlow, name: string) => Promise<void>;
    deleteLabel: (client: ImapFlow, name: string) => Promise<void>;
}
export declare function detectLabelStrategy(client: ImapFlow): Promise<LabelStrategy>;
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