import { EmailError } from '@fluxmail/core';
export declare function isInsufficientScope(err: unknown): boolean;
export declare function isRetryable(err: unknown): boolean;
/**
 * A non-idempotent request can be committed before a 5xx reaches the client,
 * so retrying can duplicate its effect. Retry only responses that reject the
 * request before processing it.
 */
export declare function isRetryableForNonIdempotentRequest(err: unknown): boolean;
/** Map googleapis errors onto the normalized EmailError codes. */
export declare function toEmailError(err: unknown): EmailError;
export declare function withRetry<T>(fn: () => Promise<T>, maxRetries?: number, retryable?: (err: unknown) => boolean, signal?: AbortSignal): Promise<T>;
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