/**
 * Client logger metadata schema and reserved flat-entry keys.
 */
/** Keys that must not be supplied via structured metadata (would break flat log formatting). */
export declare const RESERVED_CLIENT_LOG_ENTRY_KEYS: readonly ["level", "message", "timestamp", "service", "app", "environment", "appEnv", "deploymentEnvironment"];
export type ReservedClientLogEntryKey = (typeof RESERVED_CLIENT_LOG_ENTRY_KEYS)[number];
export type ClientLoggerMeta = {
    module?: string;
    feature?: string;
    operation?: string;
    correlationId?: string;
    errorCode?: string;
    [key: string]: unknown;
};
export type ClientLogLevel = 'info' | 'warn' | 'error' | 'debug';
export interface ClientLogger {
    info: (message: string, ...rest: unknown[]) => void;
    warn: (message: string, ...rest: unknown[]) => void;
    error: (messageOrError: string | unknown, ...rest: unknown[]) => void;
    debug: (message: string, ...rest: unknown[]) => void;
}
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