import * as i0 from "@angular/core";
export declare abstract class Logger {
    fatal(message: string, ...additional: any[]): void;
    error(message: string, ...additional: any[]): void;
    warn(message: string, ...additional: any[]): void;
    info(message: string, ...additional: any[]): void;
    log(message: string, ...additional: any[]): void;
    debug(message: string, ...additional: any[]): void;
    trace(message: string, ...additional: any[]): void;
    static ɵfac: i0.ɵɵFactoryDeclaration<Logger, never>;
    static ɵprov: i0.ɵɵInjectableDeclaration<Logger>;
}