import type { LayoutElement } from "../layoutElement.js";
/**
 * Contains the subsets of fonts
 * Only the present entries are used, the rest should be ignored during subset creation
 */
export interface SubsetConfig {
    /**
     * The normal font subset
     */
    normal?: string;
    /**
     * The italic font subset
     */
    italic?: string;
    /**
     * The bold font subset
     */
    bold?: string;
    /**
     * The bold italic font subset
     */
    boldItalic?: string;
}
/**
 * Helper to collect font subsets
 */
export declare class SubsetCollector {
    private readonly defaultFont;
    /**
     * Temporary subsets
     */
    private readonly temporarySubsets;
    /**
     * The computed subsets
     */
    readonly subsets: Map<string, SubsetConfig>;
    /**
     * Creats a new subset collector
     * Results are stored in the subsets field, which can be accessed after construction
     *
     * @param element the element to collect the font subset information for
     * @param defaultFont the default font to use if no font is specified for a span
     */
    constructor(element: LayoutElement, defaultFont: string);
    /**
     * Recursively collects the font subset information of the given element
     *
     * @param element the element to collect the subset information for
     */
    private collect;
    /**
     * Gets the subsets based on the font family, weight and style
     * Assumes that the provided element is a span
     *
     * @returns the subset for the given font family, weight and style
     */
    private getSubset;
    /**
     * Converts a temporary subset to a subset config
     * If the temporary subset is empty, undefined is returned
     *
     * @param temporary the temporary subset
     * @returns the subset config
     */
    private convertToSubset;
}
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