export declare const LOG_LEVELS: {
    readonly TRACE: "0";
    readonly DEBUG: "1";
    readonly INFO: "2";
    readonly WARN: "3";
    readonly ERROR: "4";
    readonly FATAL: "5";
    readonly OFF: "6";
};
export type LogLevel = (typeof LOG_LEVELS)[keyof typeof LOG_LEVELS];
/**
 * Converts the FAUNA_DEBUG environment variable (string) into a LogLevel.
 *   The intended use is to set FAUNA_DEBUG=0|1|2|3|4.
 *
 *   This function will convert null, undefined, empty, or or any non matching
 *   string to a LogLevel of OFF.
 *
 * @param debug_level - The String value of FAUNA_DEBUG.
 */
export declare function parseDebugLevel(debug_level: string | undefined): LogLevel;
export interface LogHandler {
    trace(msg: string, ...args: any[]): void;
    debug(msg: string, ...args: any[]): void;
    info(msg: string, ...args: any[]): void;
    warn(msg: string, ...args: any[]): void;
    error(msg: string, ...args: any[]): void;
    fatal(msg: string, ...args: any[]): void;
}
export declare class ConsoleLogHandler implements LogHandler {
    #private;
    constructor(level: LogLevel);
    trace(msg: string, ...args: any[]): void;
    debug(msg: string, ...args: any[]): void;
    info(msg: string, ...args: any[]): void;
    warn(msg: string, ...args: any[]): void;
    error(msg: string, ...args: any[]): void;
    fatal(msg: string, ...args: any[]): void;
}
export declare function defaultLogHandler(): LogHandler;