/**
 * JEST_WORKER_ID environment variable.
 * Set when running tests with Jest.
 */
export declare function getJestWorkerId(): string;
/**
 * VITEST environment variable.
 * Set when running tests with Vitest.
 */
export declare function getVitest(): boolean;
/**
 * Check if code is running in a test environment.
 * Checks NODE_ENV, VITEST, and JEST_WORKER_ID.
 */
export declare function isTest(): boolean;
