declare const LOG_LEVELS: readonly ["debug", "info", "warn", "error", "disabled"];
export type LogLevelName = (typeof LOG_LEVELS)[number];
type PrimitiveValue = undefined | null | string | string[] | number | number[] | boolean | boolean[];
type Value = {
    [key: string]: PrimitiveValue | Value | PrimitiveValue[] | Value[];
};
export type Metadata = Value & {
    message?: never;
};
type ForbidenMetadataKey = 'message';
/**
 * Logger class that can be configured with metadata add creation and when logging to add additional context to your logs.
 */
export default class Logger {
    private metadata;
    private level;
    constructor(metadata?: Metadata);
    /**
     * Sets the minimum log level. Messages below this level are suppressed.
     * @param level The minimum log level name.
     */
    setLevel(level: LogLevelName): void;
    /**
     * Logs an error message with the 'error' log level.
     * @param message The error message to be logged.
     * @param metadata Optional metadata to be associated with the log message.
     */
    error(message: string, metadata?: Metadata): void;
    /**
     * Logs a warning message with the 'warn' log level.
     * @param message The warning message to be logged.
     * @param metadata Optional metadata to be associated with the log message.
     */
    warn(message: string, metadata?: Metadata): void;
    /**
     * Logs an informational message with the 'info' log level.
     * @param message The informational message to be logged.
     * @param metadata Optional metadata to be associated with the log message.
     */
    info(message: string, metadata?: Metadata): void;
    /**
     * Logs a debug message with the 'debug' log level.
     * @param message The debug message to be logged.
     * @param metadata Optional metadata to be associated with the log message.
     */
    debug(message: string, metadata?: Metadata): void;
    /**
     * Decorates the logger with additional metadata.
     * @param metadata Additional metadata to be added to the logger.
     */
    decorate(metadata: Metadata): void;
    /**
     * Return a copy of the Logger's metadata.
     * @returns The  {@link Metadata} associated with the logger.
     */
    getMetadata(): Metadata;
    /**
     * Sets a key-value pair in the metadata. If the key already exists, it will be overwritten.
     *
     * @param key Key of the metadata to be set.
     * May be any string other than 'message', which is reserved for the actual message logged.
     * @param value Value of the metadata to be set.
     */
    setMetadata<Key extends string>(key: Key extends ForbidenMetadataKey ? never : Key, value: PrimitiveValue | Value): void;
    /**
     * Clears the Logger's metadata.
     */
    clearMetadata(): void;
    log(logLevel: Exclude<LogLevelName, 'disabled'>, message: string, metadata?: Metadata): void;
    private static snakifyKeys;
    private static pruneSensitiveMetadata;
    /**
     * Colorizes the log message based on the log level and status codes.
     * @param message The message to colorize.
     * @param metadata The metadata associated with the log.
     * @param logLevel The log level of the message.
     * @returns The colorized output string.
     */
    private static colorize;
}
export declare const NULL_LOGGER: Logger;
export {};