import { ByteArray } from '../../types.js';
import { PdfToken } from '../tokens/token.js';
export declare abstract class PdfObject {
    /** Optional tokens to prepend or append during serialization */
    preTokens?: PdfToken[];
    /** Optional tokens to prepend or append during serialization */
    postTokens?: PdfToken[];
    /** Indicates whether the object has been modified. By default, assume it has been modified because it's a new object */
    protected modified: boolean;
    /** Indicates whether the object is immutable (cannot be modified) */
    protected immutable: boolean;
    /** Tokenizes the object into an array of PdfTokens */
    protected abstract tokenize(): PdfToken[];
    /** Cached byte representation of the object, if available */
    protected cachedTokens?: PdfToken[];
    /** The type of this PDF object */
    get objectType(): string;
    /**
     * Returns true if this object's serialized form ends with a self-delimiting
     * character (e.g., `)`, `>`, `]`, `>>`). Such objects do not require trailing
     * whitespace before the next token.
     */
    get isTrailingDelimited(): boolean;
    /** Indicates whether the object has been modified. Override this method if the modified state is determined differently */
    isModified(): boolean;
    /** Sets the modified state of the object. Override this method if the modified state is determined differently */
    setModified(modified?: boolean): void;
    /** Indicates whether the object is immutable (cannot be modified) */
    isImmutable(): boolean;
    /** Sets the immutable state of the object */
    setImmutable(immutable?: boolean): void;
    /** Converts the object to an array of PdfTokens, including any pre or post tokens */
    toTokens(): PdfToken[];
    /** Converts the object to a ByteArray, optionally padding to a specified length */
    toBytes(padTo?: number): ByteArray;
    /** Converts the object to a string representation */
    toString(): string;
    /** Attempts to cast the object to a specific PdfObject subclass */
    as<T extends PdfObject>(ctor: new (...args: any[]) => T): T;
    /** Creates a deep clone of the object. Override this method in subclasses to ensure all properties are cloned correctly */
    protected abstract cloneImpl(): this;
    /** Creates a deep clone of the object */
    clone(): this;
    /** Compares this object to another for equality based on their token representations */
    equals(other?: PdfObject): boolean;
    /**
     * Serializes the document to a Base64-encoded string.
     *
     * @returns A promise that resolves to the PDF document as a Base64 string
     */
    toBase64(): string;
    abstract toJSON(): object;
}