export type LogLevel = 'debug' | 'info' | 'warn' | 'error' | 'silent';
export declare class Logger {
    private static instance;
    private prefix;
    private debugMode;
    private logLevel;
    constructor(prefix?: string);
    static getInstance(prefix?: string): Logger;
    setDebugMode(enabled: boolean): void;
    setLogLevel(level: LogLevel): void;
    getLogLevel(): LogLevel;
    debug(message: string, ...args: unknown[]): void;
    info(message: string, ...args: unknown[]): void;
    warn(message: string, ...args: unknown[]): void;
    error(message: string, ...args: unknown[]): void;
    /**
     * Returns a copy of an object with the values of sensitive keys (apiKey,
     * writeKey, accessToken, token, secret, dsn, password, auth, credential, …)
     * replaced by '[REDACTED]'. This is applied automatically to every argument
     * of debug/info/warn/error (see the sink methods above), so provider config
     * — tokens, DSNs, write keys — never reaches the console even when a consumer
     * raises the log level or enables debug mode.
     *
     * Primitives, arrays, and Error instances are returned unchanged (Errors keep
     * their message/stack for logging); recursion is capped to avoid runaway
     * traversal of deep or circular objects.
     */
    static redact<T>(value: T, depth?: number): T;
    private shouldLog;
}