import { type DataSourceApi } from '@grafana/data';
export declare function getCachedPlugin(uid: string): DataSourceApi | undefined;
export declare function setCachedPlugin(uid: string, instance: DataSourceApi): void;
/** Write a runtime-registered plugin instance. Runtime entries survive {@link clearPluginCache}. */
export declare function setRuntimePlugin(uid: string, instance: DataSourceApi): void;
/**
 * Clear all non-runtime plugin instances. Runtime entries are preserved,
 * matching the behaviour of the legacy `DatasourceSrv.init()` which reset
 * `this.datasources` then re-added runtime sources.
 */
export declare function clearPluginCache(): void;
/**
 * Test helper — resets all module state. Should only be called from tests.
 *
 * @internal
 */
export declare function _resetForTests(): void;