import { InjectionToken } from '@angular/core';
/**
 * Bitwise enum for configuring log levels.
 */
export declare enum LOGGER_LEVEL {
    DEBUG = 1,
    ERROR = 2,
    INFO = 4,
    LOG = 8,
    WARN = 16
}
/**
 * Token to inject logging levels.
 */
export declare const LOGGER_LEVELS: InjectionToken<LOGGER_LEVEL>;
/**
 * Token to inject tails that should removed from prefixes.
 */
export declare const LOGGER_TAILS: InjectionToken<string[]>;
/**
 * Token to inject the browser's console.
 */
export declare const LOGGER_CONSOLE: InjectionToken<ConsoleMethods<void>>;
/**
 * Logs all levels
 */
export declare const LOGGER_ALL: number;
/**
 * Defaults list of tails to remove.
 */
export declare const LOGGER_TAILS_DEFAULT: string[];
/**
 * Defines the function type for a console method.
 */
export declare type ConsoleMethod<TReturn> = (...params: any[]) => TReturn;
/**
 * Defines a console method that does not log output.
 */
export declare const ConsoleNoop: ConsoleMethod<void>;
/**
 * Defines the methods that can be called on the console.
 */
export interface ConsoleMethods<TReturn> {
    /**
     * Defined as a function property to ensure console logs the correct file/line reference.
     */
    debug: ConsoleMethod<TReturn>;
    /**
     * Defined as a function property to ensure console logs the correct file/line reference.
     */
    error: ConsoleMethod<TReturn>;
    /**
     * Defined as a function property to ensure console logs the correct file/line reference.
     */
    info: ConsoleMethod<TReturn>;
    /**
     * Defined as a function property to ensure console logs the correct file/line reference.
     */
    log: ConsoleMethod<TReturn>;
    /**
     * Defined as a function property to ensure console logs the correct file/line reference.
     */
    warn: ConsoleMethod<TReturn>;
}
/**
 * Defines configuration for the logger module.
 */
export interface LoggerConfig {
    /**
     * A reference to the browser's console.
     */
    console?: ConsoleMethods<void>;
    /**
     * False to replace logger with a noop service that disables all console output.
     */
    enabled?: boolean;
    /**
     * Logging levels settings to 0 is not as effective as setting enabled to false.
     */
    levels?: LOGGER_LEVEL;
    /**
     * Strings to be removed from the tail of logger prefixes.
     */
    tails?: string[];
}