/** Represents the available logging levels. */
export declare enum LogLevel {
    error = 0,
    warn = 1,
    info = 2,
    debug = 3
}
/** Structure of the data passed to listener callbacks. */
export interface LogEntry {
    level: LogLevel;
    message: string;
}
/** Type signature for listener callback functions. */
export type LogCallback = (entry: LogEntry) => void;
/**
 * A singleton logger class for Zenid applications.
 */
declare class ZenidLogger {
    private listeners;
    private stringify;
    /**
     * Logs a message at the specified level.
     * Internal method called by public level-specific methods.
     * @param level The severity level of the log message.
     * @param message The message or data to log. If not a string, it will be JSON.stringified.
     * @param data Optional additional data to log.
     */
    log(level: LogLevel, message: unknown, data?: unknown): void;
    /** Logs an error message. */
    error(message: unknown, data?: unknown): void;
    /** Logs a warning message. */
    warn(message: unknown, data?: unknown): void;
    /** Logs an informational message. */
    info(message: unknown, data?: unknown): void;
    /** Logs a debug message. */
    debug(message: unknown, data?: unknown): void;
    /**
     * Adds a listener callback that will be invoked for log messages
     * at or above the specified level.
     * @param callback The function to call when a log event occurs.
     * @param minLogLevel The minimum log level for this listener to receive messages.
     */
    addListener(callback: LogCallback, minLogLevel?: LogLevel): void;
    /**
     * Removes all registered listeners.
     */
    clearListeners(): void;
    private static instance;
    static defaultConsoleListener: LogCallback;
    private constructor();
    /**
     * Gets the single instance of the ZenidLogger.
     * @returns The singleton ZenidLogger instance.
     */
    static getInstance(): ZenidLogger;
}
export declare const zenidLog: ZenidLogger;
export {};
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