import { Subset } from '../interface';
import { FontBaseTool } from './getFeatureQueryFromBuffer';
/** 从字体中获取 Feature 的数据数组 */
export declare const getFeatureData: (fontTool: FontBaseTool) => number[][];
/** 将多个关系行，合并为元素的合集映射 */
export declare const getFeatureMap: (featureData: number[][]) => Map<number, Set<number>>;
export type FeatureMap = Map<number, Set<number> | null>;
/** 从单个 unicode 中找出 feature 相关的数据 */
export declare const processSingleUnicodeWithFeature: (i: number, featureMap: FeatureMap) => number[];
/**
 * 装饰普通的 Subset 使其能够使用 opentype feature
 * @important 注意，是 subset 而不是 subsets
 */
export declare const decorateSubset: (subset: Subset, featureMap: FeatureMap) => number[];