import type { google } from '@gcf/firestore-protos';
/**
 * Validates a GAPIC {@link google.firestore.v1.ITransactionOptions} object.
 *
 * Semantics enforced:
 * - Exactly one of `readOnly` or `readWrite` must be specified.
 * - If `readWrite.retryTransaction` is present, it must be a non-empty `Uint8Array`.
 *
 * Behavior:
 * - If `options` is `null`/`undefined`, validation is a no-op.
 * - Violations throw a `GoogleError` with `Status.INVALID_ARGUMENT` via the shared
 *   assertion helpers in `./assert`.
 *
 * Expected shapes (subset):
 * ```ts
 * // Read-only transaction
 * { readOnly: { readTime?: google.protobuf.ITimestamp } }
 *
 * // Read-write transaction
 * { readWrite: { retryTransaction?: Uint8Array } }
 * ```
 *
 * @param options - The transaction options to validate.
 * @throws {GoogleError} If both or neither of `readOnly` / `readWrite` are provided,
 *                       or if `readWrite.retryTransaction` is not a non-empty `Uint8Array`.
 */
export declare function validateTransactionOptions(options: google.firestore.v1.ITransactionOptions | null | undefined): void;
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