/// <reference types="node" />
/// <reference types="node" />
/**
 * Centralized PDF document loading utilities
 * Used by multiple APIs to eliminate duplicate loading logic
 */
export declare class PdfLoader {
    static nodeCanvasFactory: any;
    /**
     * Load PDF document from buffer with validation
     * @param input PDF buffer (Buffer, ArrayBuffer, or Uint8Array)
     * @returns Promise resolving to PDFDocumentProxy
     */
    static loadFromBuffer(input: Buffer | ArrayBuffer | Uint8Array): Promise<any>;
    /**
     * Validate input buffer
     */
    private static validateInput;
}
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