import { status as GrpcStatus } from '@grpc/grpc-js';
/**
 * gRPC status codes for which subscription operations should be retried.
 *
 * Includes both:
 * 1. GCP-documented retryable errors (DEADLINE_EXCEEDED, RESOURCE_EXHAUSTED, INTERNAL, UNAVAILABLE)
 * 2. Eventual consistency errors common after Terraform deployments (NOT_FOUND, PERMISSION_DENIED)
 *
 * **Why PERMISSION_DENIED is included:**
 * After Terraform deployments, IAM permissions can take several minutes to propagate across
 * GCP's distributed infrastructure. During this window, the subscription may report
 * PERMISSION_DENIED even though permissions are correctly configured.
 *
 * **Why NOT_FOUND is included:**
 * Similar to PERMISSION_DENIED, newly created subscriptions may not be immediately visible
 * across all GCP endpoints due to eventual consistency.
 *
 * @see https://cloud.google.com/pubsub/docs/reference/error-codes
 * @see https://github.com/googleapis/nodejs-pubsub/issues/979
 */
export declare const RETRYABLE_GRPC_STATUS_CODES: readonly [GrpcStatus.DEADLINE_EXCEEDED, GrpcStatus.NOT_FOUND, GrpcStatus.PERMISSION_DENIED, GrpcStatus.RESOURCE_EXHAUSTED, GrpcStatus.INTERNAL, GrpcStatus.UNAVAILABLE];
export type RetryableGrpcStatusCode = (typeof RETRYABLE_GRPC_STATUS_CODES)[number];
/**
 * Type for errors with a numeric gRPC status code and message.
 */
export type GrpcError = {
    code: number;
    message: string;
};
/**
 * Checks if an error has gRPC error properties (code and message).
 * Uses duck typing to avoid fragile instanceof checks.
 *
 * @param error - The error to check
 * @returns true if the error has numeric `code` and string `message` properties
 */
export declare function isGrpcError(error: unknown): error is GrpcError;
/**
 * Checks if an error is a gRPC error with a retryable status code.
 *
 * @param error - The error to check
 * @returns true if the error has a retryable gRPC status code
 */
export declare function isRetryableGrpcError(error: unknown): error is GrpcError;
/**
 * Gets the gRPC status code from an error if it has one.
 *
 * @param error - The error to extract the code from
 * @returns The gRPC status code, or undefined if not a gRPC error
 */
export declare function getGrpcStatusCode(error: unknown): number | undefined;
export { GrpcStatus };