import { CodeChunk, DocType } from '../types';
export declare class ValidationError extends Error {
    field?: string | undefined;
    value?: any | undefined;
    constructor(message: string, field?: string | undefined, value?: any | undefined);
}
export declare class ValidationUtils {
    /**
     * Validates that a value is not null or undefined
     */
    static required<T>(value: T | null | undefined, fieldName: string): T;
    /**
     * Validates that a string is not empty or whitespace
     */
    static nonEmptyString(value: string | null | undefined, fieldName: string): string;
    /**
     * Validates that a number is within a valid range
     */
    static numberInRange(value: number | null | undefined, fieldName: string, min?: number, max?: number): number;
    /**
     * Validates that an array is not empty
     */
    static nonEmptyArray<T>(value: T[] | null | undefined, fieldName: string): T[];
    /**
     * Validates file path exists and is accessible
     */
    static validFilePath(value: string | null | undefined, fieldName: string): string;
    /**
     * Validates that a DocType is valid
     */
    static validDocType(value: string | null | undefined, fieldName: string): DocType;
    /**
     * Validates CodeChunk structure
     */
    static validCodeChunk(chunk: any, index: number): CodeChunk;
    /**
     * Validates temperature value for AI models
     */
    static validTemperature(value: number | null | undefined, fieldName: string): number;
    /**
     * Validates max tokens for AI models
     */
    static validMaxTokens(value: number | null | undefined, fieldName: string): number;
    /**
     * Safely extracts string from potentially unsafe input
     */
    static safeString(value: unknown): string;
    /**
     * Safely extracts number from potentially unsafe input
     */
    static safeNumber(value: unknown, defaultValue?: number): number;
    /**
     * Validates API key format (basic validation)
     */
    static validApiKey(value: string | null | undefined, fieldName: string): string;
}
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