import type * as SentryBrowser from '@sentry/browser';
/**
 * Returns the resolved Sentry SDK for the current runtime, or `null` if no
 * SDK can be loaded. Idempotent and cached.
 */
export declare function getSentrySDK(): typeof SentryBrowser | null;
/**
 * Returns the detected runtime label (`'browser'` | `'node'` | `'unknown'`).
 * Used to set the `sdk.runtime` Sentry tag.
 */
export declare function getSentryRuntime(): 'browser' | 'node' | 'unknown';
/**
 * Reset the cached SDK reference and runtime detection. Test-only.
 */
export declare function resetSentryRuntime(): void;