/**
 * Validator class for repository operations.
 *
 * Provides centralized static validation methods for method parameters.
 * All methods throw {@link ValidationError} on invalid input.
 *
 * @remarks
 * This class separates validation concerns from business logic in
 * ProtopediaInMemoryRepositoryImpl, improving testability and maintainability.
 * All methods are static and stateless.
 *
 * For snapshot validation, use {@link validateSerializableSnapshot} directly
 * from './validation/index.js'.
 */
export declare class RepositoryParamsValidator {
    /**
     * Validate prototype ID parameter.
     *
     * @param id - Prototype ID to validate
     * @throws {ValidationError} If ID is invalid
     *
     * @example
     * ```ts
     * RepositoryParamsValidator.validatePrototypeId(123); // OK
     * RepositoryParamsValidator.validatePrototypeId(0);   // throws ValidationError
     * RepositoryParamsValidator.validatePrototypeId(-1);  // throws ValidationError
     * ```
     */
    static validatePrototypeId(id: number): void;
    /**
     * Validate sample size parameter.
     *
     * @param size - Sample size to validate
     * @throws {ValidationError} If size is invalid
     *
     * @example
     * ```ts
     * RepositoryParamsValidator.validateSampleSize(10);  // OK
     * RepositoryParamsValidator.validateSampleSize(0);   // OK
     * RepositoryParamsValidator.validateSampleSize(-5);  // OK (handled by caller)
     * RepositoryParamsValidator.validateSampleSize(1.5); // throws ValidationError
     * ```
     */
    static validateSampleSize(size: number): void;
}
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