export declare function isUuid(value: unknown): value is string;
/**
 * Validates that a value is a valid RFC 4122 UUID. Throws with a clear,
 * actionable error message if not. Use at SDK method entry points where the
 * value is forwarded to an endpoint whose backing column is a PostgreSQL UUID.
 *
 * @param value - The value to validate
 * @param fieldName - Name of the field for the error message (e.g., `'uniqueId'`, `'contextUniqueId'`)
 * @throws {TypeError} If the value is not a valid UUID
 */
export declare function assertUuid(value: unknown, fieldName: string): asserts value is string;
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