import * as stream from "node:stream";
import { LogContext } from "../commons/log_context.js";
import { Node } from "../commons/node.js";
export interface FilterOptions<MessageT> {
    filter: (logContext: LogContext<MessageT>) => Promise<boolean> | boolean;
}
export declare class Filter<MessageT = string> extends Node<LogContext<MessageT>, LogContext<MessageT>> {
    constructor(options: FilterOptions<MessageT>, streamOptions?: stream.TransformOptions);
}