import { PDFObject } from './pdf-object.ts';
import type { PDFWriter } from './pdf-writer.ts';
/**
 * Represents a PDF array object, which is an ordered collection of PDF objects.
 */
export declare class PDFArray extends PDFObject {
    private readonly elements;
    /**
     * Creates a PDFArray from an array of PDFObjects or primitive values.
     */
    static of(elements: readonly (PDFObject | string | number | boolean | null)[]): PDFArray;
    /**
     * Creates a new empty PDFArray instance.
     */
    constructor(elements?: readonly PDFObject[]);
    [Symbol.iterator](): Iterator<PDFObject>;
    /**
     * Returns the element at the specified index, or undefined if out of bounds.
     */
    at(index: number): PDFObject | undefined;
    /**
     * Adds one or more elements to the end of the array.
     */
    push(...elements: (PDFObject | string | number | boolean | null)[]): void;
    /**
     * Returns the number of elements in the array.
     */
    size(): number;
    /**
     * Writes the PDF array to the given PDFWriter.
     */
    write(writer: PDFWriter): void;
}