import { Subject } from 'rxjs';
import { GenericFunction, LocalObject } from './general';
/**
 * Parameters for registering a data source with the data service.
 */
export declare class RegisterDataSourceParams {
    /**
     * The unique identifier for the data source.
     */
    id: string;
    /**
     * The message for the data source.
     */
    message?: DataSourceMessage;
    /**
     * The initial value for the data source.
     */
    value?: unknown;
    /**
     * Whether to emit the first value.
     */
    emitFirstValue?: boolean;
    /**
     * Whether to emit if the value is undefined.
     */
    emitIfUndefined?: boolean;
    constructor(id?: string, message?: DataSourceMessage, value?: unknown, emitFirstValue?: boolean, emitIfUndefined?: boolean);
}
/**
 * A message for a data source.
 */
export declare class DataSourceMessage {
    /**
     * The unique identifier for the sender. Defaults to 'root'.
     */
    senderID: string;
    /**
     * The unique identifier for the target. Defaults to 'all'.
     */
    targetID: string;
    /**
     * The value of the message.
     */
    value: unknown;
    /**
     * Whether to emit the message. Defaults to true.
     */
    emit?: boolean;
    constructor(value?: unknown, senderID?: string, targetID?: string);
    /**
     * Checks if the reader can read the value, and if so, calls the callback with the value.
     *
     * @param reader - The object reading the value.
     * @param callback - The callback to call with the value.
     */
    readValue(reader: LocalObject, callback: GenericFunction<unknown>): void;
    [key: string]: unknown;
}
/**
 * A data source.
 */
export declare class DataSource {
    /**
     * The subject for the data source.
     */
    value$: Subject<DataSourceMessage>;
    /**
     * The observable for the value.
     */
    valueObservable: import("rxjs").Observable<DataSourceMessage>;
    /**
     * The unique identifier for the data source.
     */
    id: string;
    /**
     * The stored value of the data source.
     */
    private _value?;
    constructor(id?: string, message?: DataSourceMessage, emitFirstValue?: boolean, emitIfUndefined?: boolean);
    /**
     * @returns The value of the data source.
     */
    getValue(): unknown;
    /**
     * Sets the value of the data source.
     *
     * @param message - The message to set the value.
     */
    setValue(message: Partial<DataSourceMessage>): void;
}
export type DataSourceCallback = (message: DataSourceMessage) => void;