import { ValidationOptions } from 'class-validator';
/**
 * Custom decorator that validates whether a given string is a valid customer ID.
 *
 * A valid customer ID:
 * - Must be a string.
 * - Must have exactly 10 digits.
 * - Must start with "000" (e.g., "0001234567").
 *
 * ### Example:
 * ```ts
 * class CustomerDTO {
 *   @IsValidCustomerID({ message: 'Invalid customer ID format' })
 *   customerId: string;
 * }
 * ```
 *
 * @param validationOptions Optional validation options like error message.
 * @returns A property decorator to validate customer ID format.
 */
export declare function IsValidCustomerID(validationOptions?: ValidationOptions): (object: object, propertyName: string) => void;
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