import type { OptionalArgument } from '../type/optional-argument/index.js';
import type { ISyncerPromise } from './SyncerPromise.js';
import { UNSET } from '../_/symbols/unset.js';
export interface ISyncerNested {
    onAsyncStart?: ((promise: PromiseLike<any>) => PromiseLike<void> | void) | undefined;
    syncerIterator: ISyncerPromise;
}
export interface SyncerNested_<Intermediate> {
    onAsyncStart?: ((promise: PromiseLike<Intermediate>) => PromiseLike<void> | void) | undefined;
    syncerIterator: ISyncerPromise<Intermediate>;
}
export type SyncerNested<Intermediate extends OptionalArgument<unknown> = UNSET> = Intermediate extends UNSET ? ISyncerNested : SyncerNested_<Intermediate>;
export declare function isSyncerNested(x: unknown): x is ISyncerNested;
//# sourceMappingURL=SyncerNested.d.ts.map