import { Log, LogContext } from './context';
export declare type trigger = () => void;
export declare type processLog = (data: Log) => void;
export interface Aggregator {
    readonly append: processLog;
    readonly flush: trigger;
}
export declare type attachEmitter = (emit: processLog) => Aggregator;
export declare function updateContext(base: LogContext, supplement: LogContext): {
    from: string;
    count: number;
    to: string;
    level: import("./level").log_level;
    tags: readonly string[];
    type: import("./type").loggable_type;
};