export declare enum LogLevel {
    DEBUG = "debug",
    INFO = "info",
    WARN = "warn",
    ERROR = "error"
}
export interface IMessageLogger {
    logMessageCreated(messageId: string, senderId: string, recipientCount: number): void;
    logRoutingDecision(messageId: string, strategy: string, recipientCount: number): void;
    logDeliveryFailure(messageId: string, recipientId: string, error: string): void;
    logEncryptionFailure(error: string): void;
    logSlowQuery(queryType: string, durationMs: number): void;
}
export declare class MessageLogger implements IMessageLogger {
    private readonly minLevel;
    private readonly logger;
    constructor(minLevel?: LogLevel, logger?: (level: LogLevel, message: string, data?: Record<string, unknown>) => void);
    logMessageCreated(messageId: string, senderId: string, recipientCount: number): void;
    logRoutingDecision(messageId: string, strategy: string, recipientCount: number): void;
    logDeliveryFailure(messageId: string, recipientId: string, error: string): void;
    logEncryptionFailure(error: string): void;
    logSlowQuery(queryType: string, durationMs: number): void;
    private log;
    private shouldLog;
}
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