/**
 * Low-level PDF object primitives.
 *
 * PDF is built from a small set of object types: booleans, numbers, strings,
 * names, arrays, dictionaries, streams, and indirect object references.
 * This module provides serialization for all of them.
 *
 * @see PDF Reference 1.7, Chapter 3 - Objects
 */
/**
 * Escape a string for PDF string literal (parentheses-delimited).
 * Escapes backslash, parentheses, and non-printable characters.
 */
export declare function pdfString(value: string): string;
/**
 * Format a PDF hex string from raw bytes.
 */
export declare function pdfHexString(bytes: Uint8Array): string;
/**
 * Format a PDF name object. Names are prefixed with /.
 * Characters outside the printable ASCII range are encoded as #XX.
 */
export declare function pdfName(name: string): string;
/**
 * Format a PDF number. Integers are output without decimal point.
 * Floats are rounded to 4 decimal places to avoid floating-point noise.
 */
export declare function pdfNumber(value: number): string;
/**
 * Format a PDF boolean.
 */
export declare function pdfBoolean(value: boolean): string;
/**
 * Format a PDF array from pre-serialized elements.
 */
export declare function pdfArray(elements: string[]): string;
/**
 * Format a PDF indirect object reference.
 */
export declare function pdfRef(objectNumber: number, generation?: number): string;
/**
 * Format a PDF date string conforming to the PDF date format.
 * Format: D:YYYYMMDDHHmmSSOHH'mm
 */
export declare function pdfDate(date: Date): string;
/**
 * Builds a PDF dictionary object from key-value pairs.
 * Values are already-serialized PDF strings.
 */
export declare class PdfDict {
    private entries;
    /** When set, toString() returns this raw string. set() appends/replaces entries within it. */
    private _raw;
    /**
     * Create a PdfDict that wraps a pre-serialized dictionary string.
     * toString() returns the raw string (with any set() overrides applied).
     */
    static fromRawString(raw: string): PdfDict;
    /**
     * Set a dictionary entry. The key should NOT include the leading /.
     * The value should be a pre-serialized PDF value string.
     */
    set(key: string, value: string): this;
    /**
     * Conditionally set a dictionary entry.
     */
    setIf(condition: boolean, key: string, value: string): this;
    /**
     * Remove a dictionary entry by key.
     */
    delete(key: string): this;
    /**
     * Serialize to a PDF dictionary string.
     */
    toString(): string;
}