/// <reference types="pdfkit" />
/**
 * Either a single value x as all RGB values or normal PDFKit color values
 */
export declare type ColorValue = number | PDFKit.Mixins.ColorValue;
/**
 * An object to bring together PDFKit's font settings
 */
export interface FontStyle {
    align?: "center" | "justify" | "left" | "right";
    fontSize?: number;
    fontFamily?: string;
    fontColor?: ColorValue;
    letterSpacing?: number;
    lineHeight?: number;
    verticalAlignment?: boolean;
}
/**
 * Convert single digit color value to RGB
 * @param color pdfmills color
 */
export declare function getRGB(color: ColorValue): PDFKit.Mixins.ColorValue;
/**
 * Change font settings of a PDFKit document based on pdfmills's `FontConfig`
 * @param doc PDFKit document
 * @param config pdfmills `FontConfig`
 */
export declare function switchFont(doc: PDFKit.PDFDocument, config: FontStyle): void;