import type { PDFObject } from '../core/pdf-object.ts';
import { PDFRef } from '../core/pdf-ref.ts';
import type { PDFResource } from './pdf-resource.ts';
/**
 * Represents the context of a PDF document, managing the collection
 * of PDF objects and their references.
 */
export declare class PDFContext {
    #private;
    private _objects;
    private _registeredResources;
    /**
     * Returns an iterator over the PDF objects in the context.
     */
    objects(): IterableIterator<[PDFRef, PDFObject]>;
    /** Returns the number of objects in the context. */
    get size(): number;
    /**
     * Returns the PDF object associated with the given PDFRef, or
     * `undefined` if it does not exist.
     */
    getObject(ref: PDFRef): PDFObject | undefined;
    /**
     * Adds a PDF object to the context and returns its assigned PDFRef.
     */
    addObject(obj: PDFObject): PDFRef;
    /**
     * Registers a resource, calling `resource.register()` only the
     * first time a resource with a given key is seen. Returns the
     * cached reference on subsequent calls with the same key.
     */
    registerResource(resource: PDFResource): PDFRef;
}