import type { EventOperation, Operation, TagOperation } from "../factories/types.js";
/** An array of Symbols to preserve when building events with {@link eventPipe} */
export declare const PRESERVE_EVENT_SYMBOLS: Set<symbol>;
export declare function identity<T>(x: T): T;
/** The core method that creates a pipeline to build an event */
export declare function eventPipe(...operations: (EventOperation | undefined)[]): EventOperation;
/** The core method that creates a pipeline to create or modify an array of tags */
export declare function tagPipe(...operations: (TagOperation | undefined)[]): TagOperation;
/** A pipeline operation that does nothing */
export declare function skip<T>(): (value: T) => T;
/**
 * Pipe a value through a series of async operations
 * @example
 * ```ts
 * const result = await pipe(
 *   draft,
 *   setContent("hello"),
 *   addTag("p", pubkey),
 *   sign(signer)
 * );
 * ```
 */
export declare function pipe<T>(value: T, ...operations: Array<(v: any) => any | Promise<any>>): Promise<any>;
/**
 * @param fns - An array of operations to pipe together
 * @param preserve - If set an array of symbols to keep, all other symbols will be removed
 * @internal
 */
export declare function pipeFromAsyncArray<T, R>(fns: Array<Operation<T, R>>, preserve?: Set<symbol>): Operation<T, R>;