/**
 * PDF Form Extractor (INT-017)
 *
 * Extracts fillable form fields from PDFs using pdf-lib for AcroForm access
 * and pdf-parse for text extraction. Integrates with language-aware extraction
 * for multi-language form support.
 *
 * @example
 * ```typescript
 * import { extractPDFFormFields, createPDFFormExtractor } from 'llm-browser/sdk';
 *
 * // Quick extraction from URL
 * const result = await extractPDFFormFields('https://example.gov/form.pdf');
 * console.log(`Found ${result.fields.length} form fields`);
 *
 * // With options
 * const result2 = await extractPDFFormFields(pdfBuffer, {
 *   language: 'es',
 *   extractDocumentRequirements: true,
 *   groupIntoSections: true,
 * });
 *
 * // Using extractor class for caching
 * const extractor = createPDFFormExtractor();
 * const result3 = await extractor.extract(pdfBuffer);
 * ```
 */
import type { PDFFormExtractionResult, PDFFormExtractionOptions } from '../types/pdf-forms.js';
/**
 * Extracts form fields and document requirements from PDF files.
 * Uses pdf-lib for AcroForm field extraction and pdf-parse for text content.
 */
export declare class PDFFormExtractor {
    private cache;
    /**
     * Extract form fields and requirements from a PDF buffer
     */
    extract(pdfBuffer: Buffer, options?: PDFFormExtractionOptions): Promise<PDFFormExtractionResult>;
    /**
     * Convert a pdf-lib field to our PDFFormField interface
     */
    private convertField;
    /**
     * Map pdf-lib field type to our enum
     */
    private getFieldType;
    /**
     * Infer human-readable label from field name
     */
    private inferLabelFromName;
    /**
     * Detect language from text content
     */
    private detectLanguage;
    /**
     * Check if text contains optional indicator
     */
    private isOptionalIndicator;
    /**
     * Extract document requirements from PDF text
     */
    private extractDocumentRequirements;
    /**
     * Remove duplicate document requirements
     */
    private deduplicateRequirements;
    /**
     * Group fields into sections based on page layout or naming patterns
     */
    private groupFieldsIntoSections;
    /**
     * Extract form identification info (form numbers, authority, etc.)
     */
    private extractFormInfo;
    /**
     * Calculate confidence score based on extraction results
     */
    private calculateConfidence;
    /**
     * Clear the extraction cache
     */
    clearCache(): void;
}
/**
 * Create a new PDF form extractor instance
 */
export declare function createPDFFormExtractor(): PDFFormExtractor;
/**
 * Extract form fields from a PDF source (URL, file path, or buffer)
 */
export declare function extractPDFFormFields(source: string | Buffer, options?: PDFFormExtractionOptions): Promise<PDFFormExtractionResult>;
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