import { PDFObject } from './pdf-object.ts';
import type { PDFRef } from './pdf-ref.ts';
import { PDFWriter } from './pdf-writer.ts';
/**
 * Entry representing an object to be stored in an object stream.
 */
export type ObjectStreamEntry = {
    /** The object reference (object number and generation). */
    readonly ref: PDFRef;
    /** The PDF object to store. */
    readonly object: PDFObject;
};
/**
 * Represents a PDF object stream (`ObjStm`), which packs multiple
 * non-stream objects into a single compressed stream. This reduces file
 * size by eliminating per-object overhead and applying compression
 * across objects.
 *
 * Object streams were introduced in PDF 1.5.
 */
export declare class PDFObjectStream extends PDFObject {
    private readonly entries;
    private readonly compress;
    private constructor();
    /**
     * Creates a new object stream from the given entries.
     * All entries must have generation number 0.
     */
    static of(entries: readonly ObjectStreamEntry[], compress?: boolean): PDFObjectStream;
    /**
     * Returns the object numbers stored in this object stream, in order.
     */
    get objectNumbers(): number[];
    /**
     * Writes the object stream to the given PDFWriter.
     */
    write(writer: PDFWriter): void;
}