import { internal, LDLogger } from '@launchdarkly/js-sdk-common';
import { DataSourceStatusManager } from '../DataSourceStatusManager';
import { InitializerFactory, SynchronizerSlot } from './SourceManager';
/**
 * Callback invoked when the orchestrator produces a changeSet payload.
 */
export type DataCallback = (payload: internal.Payload) => void;
/**
 * Configuration for the {@link FDv2DataSource} orchestrator.
 */
export interface FDv2DataSourceConfig {
    /** Ordered list of initializer factories. */
    initializerFactories: InitializerFactory[];
    /** Ordered list of synchronizer slots with state. */
    synchronizerSlots: SynchronizerSlot[];
    /** Callback to deliver payloads to the consuming layer. */
    dataCallback: DataCallback;
    /** Status manager for reporting data source state transitions. */
    statusManager: DataSourceStatusManager;
    /**
     * Getter for the current selector (basis) string. The selector is managed
     * externally by the consuming layer — the orchestrator reads it via this
     * getter and passes it through to source factories.
     */
    selectorGetter: () => string | undefined;
    /** Optional logger. */
    logger?: LDLogger;
    /** Fallback condition timeout in ms (default 120s). */
    fallbackTimeoutMs?: number;
    /** Recovery condition timeout in ms (default 300s). */
    recoveryTimeoutMs?: number;
}
/**
 * The FDv2 data source orchestrator. Coordinates initializers and
 * synchronizers to provide a resilient flag data pipeline.
 */
export interface FDv2DataSource {
    /**
     * Start the orchestration loop. Returns a promise that resolves when
     * initialization is complete (first basis data received or all initializers
     * exhausted with data). The orchestration loop continues running in the
     * background after the promise resolves, driving synchronizers.
     */
    start(): Promise<void>;
    /** Close the orchestrator. Stops all active sources. */
    close(): void;
}
/**
 * Creates an {@link FDv2DataSource} orchestrator.
 */
export declare function createFDv2DataSource(config: FDv2DataSourceConfig): FDv2DataSource;
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