/**
 * TimeoutError is thrown when an operation times out.
 */
export declare class TimeoutError extends Error {
    /**
     * Initializes a new TimeoutError instance.
     *
     * @param message - The error message.
     */
    constructor(message?: string);
}
/**
 * UserInputValidationError is thrown when validation of a user-supplied input fails.
 */
export declare class UserInputValidationError extends Error {
    /**
     * Initializes a new UserInputValidationError instance.
     *
     * @param message - The user input validation error message.
     */
    constructor(message: string);
}
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