import type { ExceptionOptionType as __ExceptionOptionType } from "@smithy/core/client";
import type { OAuth2ErrorCode } from "./enums";
import { SigninServiceException as __BaseException } from "./SigninServiceException";
/**
 * Error thrown for access denied scenarios with flexible HTTP status mapping
 *
 * Runtime HTTP Status Code Mapping:
 * - HTTP 401 (Unauthorized): TOKEN_EXPIRED, AUTHCODE_EXPIRED
 * - HTTP 403 (Forbidden): USER_CREDENTIALS_CHANGED, INSUFFICIENT_PERMISSIONS
 *
 * The specific HTTP status code is determined at runtime based on the error enum value.
 * Consumers should use the error field to determine the specific access denial reason.
 * @public
 */
export declare class AccessDeniedException extends __BaseException {
    readonly name: "AccessDeniedException";
    readonly $fault: "client";
    /**
     * OAuth 2.0 error code indicating the specific type of access denial
     * Can be TOKEN_EXPIRED, AUTHCODE_EXPIRED, USER_CREDENTIALS_CHANGED, or INSUFFICIENT_PERMISSIONS
     * @public
     */
    error: OAuth2ErrorCode | undefined;
    /**
     * @internal
     */
    constructor(opts: __ExceptionOptionType<AccessDeniedException, __BaseException>);
}
/**
 * Error thrown when an internal server error occurs
 *
 * HTTP Status Code: 500 Internal Server Error
 *
 * Used for unexpected server-side errors that prevent request processing.
 * @public
 */
export declare class InternalServerException extends __BaseException {
    readonly name: "InternalServerException";
    readonly $fault: "server";
    /**
     * OAuth 2.0 error code indicating server error
     * Will be SERVER_ERROR for internal server errors
     * @public
     */
    error: OAuth2ErrorCode | undefined;
    /**
     * @internal
     */
    constructor(opts: __ExceptionOptionType<InternalServerException, __BaseException>);
}
/**
 * Error thrown when rate limit is exceeded
 *
 * HTTP Status Code: 429 Too Many Requests
 *
 * Possible OAuth2ErrorCode values:
 * - INVALID_REQUEST: Rate limiting, too many requests, abuse prevention
 *
 * Possible causes:
 * - Too many token requests from the same client
 * - Rate limiting based on client_id or IP address
 * - Abuse prevention mechanisms triggered
 * - Service protection against excessive token generation
 * @public
 */
export declare class TooManyRequestsError extends __BaseException {
    readonly name: "TooManyRequestsError";
    readonly $fault: "client";
    /**
     * OAuth 2.0 error code indicating the specific type of error
     * Will be INVALID_REQUEST for rate limiting scenarios
     * @public
     */
    error: OAuth2ErrorCode | undefined;
    /**
     * @internal
     */
    constructor(opts: __ExceptionOptionType<TooManyRequestsError, __BaseException>);
}
/**
 * Error thrown when request validation fails
 *
 * HTTP Status Code: 400 Bad Request
 *
 * Used for request validation errors such as malformed parameters,
 * missing required fields, or invalid parameter values.
 * @public
 */
export declare class ValidationException extends __BaseException {
    readonly name: "ValidationException";
    readonly $fault: "client";
    /**
     * OAuth 2.0 error code indicating validation failure
     * Will be INVALID_REQUEST for validation errors
     * @public
     */
    error: OAuth2ErrorCode | undefined;
    /**
     * @internal
     */
    constructor(opts: __ExceptionOptionType<ValidationException, __BaseException>);
}