import { MaybePromise, SyncOrAsyncIterable } from '@mithic/commons';
import { MaybeAsyncReadonlyMap } from './map.js';
/** The RHS values of a map join. */
export type MapJoinRHS<K, T extends MaybeAsyncReadonlyMap<K, unknown>[]> = {
    [K in keyof T]: ReturnType<T[K]['get']>;
};
/** Left joins a tuple iterable (e.g. a Map) with other Maps by key. */
export declare function mapJoin<L extends readonly unknown[], K, I extends MaybeAsyncReadonlyMap<K, unknown>[]>(iterable: Iterable<L>, key: (lhs: L) => K | undefined, ...indices: I): IterableIterator<[...L, ...MapJoinRHS<K, I>]>;
/** The RHS values of an async map join. */
export type AsyncMapJoinRHS<K, T extends MaybeAsyncReadonlyMap<K, unknown>[]> = {
    [K in keyof T]: Awaited<ReturnType<T[K]['get']>>;
};
/** Left joins a maybe-async tuple iterable (e.g. a Map) with other maybe-async maps by key. */
export declare function mapJoinAsync<L extends readonly unknown[], K, I extends MaybeAsyncReadonlyMap<K, unknown>[]>(iterable: SyncOrAsyncIterable<L>, key: (lhs: L) => MaybePromise<K | undefined>, ...indices: I): AsyncIterableIterator<[...L, ...AsyncMapJoinRHS<K, I>]>;
//# sourceMappingURL=join.d.ts.map