import { DataSourceApi, type DataSourceRef, type ScopedVars } from '@grafana/data';
import { type RuntimeDataSourceRegistration } from '../dataSourceSrv';
import { type ImportDataSourcePluginFn } from './types';
/**
 * Register the data source plugin importer. Called once from application boot.
 * The runtime package cannot depend on `public/app/features/plugins`, so the
 * concrete import function is injected here at startup.
 *
 * @internal
 */
export declare function setDataSourcePluginImporter(fn: ImportDataSourcePluginFn): void;
/**
 * Load and return a data source plugin instance. Resolves the data source by
 * name, uid, or {@link DataSourceRef}, caches the constructed instance, and
 * reuses it on subsequent calls. Concurrent callers for the same uid share
 * a single in-flight load.
 *
 * @public
 */
export declare function getDataSourceInstance(ref?: DataSourceRef | string | null, scopedVars?: ScopedVars): Promise<DataSourceApi>;
/**
 * Register a runtime data source. Writes to both the instance-settings cache
 * and the plugin-instance cache so the data source is available to
 * {@link getDataSourceInstanceSettings} and {@link getDataSourceInstance}.
 *
 * Runtime data sources are intentionally excluded from {@link getDataSourceInstanceSettingsList}
 * results, matching the behaviour of the legacy `DatasourceSrv.registerRuntimeDataSourceInstance`.
 *
 * @public
 */
export declare function registerRuntimeDataSourceInstance(entry: RuntimeDataSourceRegistration): void;
/**
 * Test helper — resets module-local state. Should only be called from tests.
 *
 * @internal
 */
export declare function _resetForTests(): void;