import { InputFunction } from "../engine/context";
export declare const Name: unique symbol;
export declare const Returns: unique symbol;
export declare const Arguments: unique symbol;
export declare const GetAsync: unique symbol;
export declare const AsyncFn: unique symbol;
export declare const Operations: unique symbol;
export declare const Internal: unique symbol;
export interface SyncOperation<I, O> extends InputFunction<Iterable<I>, O> {
    [Arguments]?: unknown[];
    [Name]?: string;
    [GetAsync]?: () => AsyncOperation<I, unknown>;
    [Returns]?: boolean;
    [Internal]?: boolean;
}
export interface AsyncOperation<I, O> extends InputFunction<AsyncIterable<I>, O> {
    [Arguments]?: unknown[];
    [Name]?: string;
    [Returns]?: boolean;
    [Internal]?: boolean;
}
export type Operation<I, O> = SyncOperation<I, O> | AsyncOperation<I, O>;
export type UnknownOperation = Partial<Operation<unknown, unknown>> & ((...args: unknown[]) => unknown);