export declare type LogMethod = (...args: any[]) => void;
export declare type LogFunction = ((log: LogMethod) => void) | (() => string);
export declare type Logger = {
    id: string;
    level: number;
    debug(...args: any[]): void;
    info(...args: any[]): void;
    warn(...args: any[]): void;
    error(...args: any[]): void;
    onError(logFunction: LogFunction): void;
    onWarn(logFunction: LogFunction): void;
    onInfo(logFunction: LogFunction): void;
    onDebug(logFunction: LogFunction): void;
};
/**
 * Implemented by classes which wish to append log data to a target data store.
 */
export interface Appender {
    debug(logger: Logger, ...rest: any[]): void;
    info(logger: Logger, ...rest: any[]): void;
    warn(logger: Logger, ...rest: any[]): void;
    error(logger: Logger, ...rest: any[]): void;
}
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