import { Format } from '../format';
import { Log } from '../log';
import { DateFormatter } from '../services/date-formatter';
export declare class PlainTextFormat extends Format {
    private readonly typeSpecifier;
    private readonly dateFormatter;
    private readonly jsonEncoder;
    constructor(dateFormatter?: DateFormatter);
    apply(log: Log): string;
    protected getTimestamp(log: Log): string;
    protected getSeverity(log: Log): string;
    protected getTag(log: Log): string;
    protected getMessage(log: Log): string;
    protected convertUnknownToString(value: unknown): string;
    protected getData(log: Log): string;
    protected hasData(log: Log): boolean;
}