import { BaseChannel } from "./base.js";
/**
 * Stores the last value received, can receive at most one value per step.
 *
 * Since `update` is only called once per step and value can only be of length 1,
 * LastValue always stores the last value of a single node. If multiple nodes attempt to
 * write to this channel in a single step, an error will be thrown.
 * @internal
 */
export declare class LastValue<Value> extends BaseChannel<Value, Value, Value> {
    lc_graph_name: string;
    value: [Value] | [];
    fromCheckpoint(checkpoint?: Value): this;
    update(values: Value[]): boolean;
    get(): Value;
    checkpoint(): Value;
    isAvailable(): boolean;
}
/**
 * Stores the last value received, but only made available after finish().
 * Once made available, clears the value.
 * @internal
 */
export declare class LastValueAfterFinish<Value> extends BaseChannel<Value, Value, [
    Value,
    boolean
]> {
    lc_graph_name: string;
    value: [Value] | [];
    finished: boolean;
    fromCheckpoint(checkpoint?: [Value, boolean]): this;
    update(values: Value[]): boolean;
    get(): Value;
    checkpoint(): [Value, boolean] | undefined;
    consume(): boolean;
    finish(): boolean;
    isAvailable(): boolean;
}