import { Interceptor, StatusObject } from '@grpc/grpc-js';
export interface GrpcRetryOptions {
    /**
     * A function which accepts the current retry attempt (starts at 1) and returns the millisecond
     * delay that should be applied before the next retry.
     */
    delayFunction: (attempt: number, status: StatusObject) => number;
    /**
     * A function which accepts a failed status object and returns true if the call should be retried
     */
    retryableDecider: (attempt: number, status: StatusObject) => boolean;
}
/**
 * Options for the backoff formula: `factor ^ attempt * initialIntervalMs(status) * jitter(maxJitter)`
 */
export interface BackoffOptions {
    /**
     * Exponential backoff factor
     *
     * @default 1.7
     */
    factor: number;
    /**
     * Maximum number of attempts
     *
     * @default 10
     */
    maxAttempts: number;
    /**
     * Maximum amount of jitter to apply
     *
     * @default 0.2
     */
    maxJitter: number;
    /**
     * Function that returns the "initial" backoff interval based on the returned status.
     *
     * The default is 1 second for RESOURCE_EXHAUSTED errors and 100 millis for other retryable errors.
     */
    initialIntervalMs(status: StatusObject): number;
    /**
     * Function that returns the "maximum" backoff interval based on the returned status.
     *
     * The default is 5 seconds regardless of the status.
     */
    maxIntervalMs(status: StatusObject): number;
}
/**
 * Generates the default retry behavior based on given backoff options
 */
export declare function defaultGrpcRetryOptions(options?: Partial<BackoffOptions>): GrpcRetryOptions;
export declare function isRetryableError(status: StatusObject): boolean;
/**
 * Returns a GRPC interceptor that will perform automatic retries for some types of failed calls
 *
 * @param retryOptions Options for the retry interceptor
 */
export declare function makeGrpcRetryInterceptor(retryOptions: GrpcRetryOptions): Interceptor;