export declare enum FeatureType {
    None = 0,
    Hidden = 1,
    DefaultOff = 16,
    DefaultOn = 32
}
export interface Feature {
    tag: string;
    description: string;
    options: string[];
    alternateCharacters: string[];
    type?: FeatureType;
}
export interface RegisteredFeature {
    tag: string;
    description: string;
    type?: FeatureType;
}
export default class Features {
    static getFeaturesFromFile(file: string): Promise<Feature[]>;
    static getFeaturesFromUrl(url: string): Promise<Feature[] | null>;
    static getFeaturesFromArrayBuffer(buffer: ArrayBuffer): Promise<Feature[]>;
    static _getFeaturesFromFont(font: any): Promise<Feature[]>;
    static _lookupCodePoints(glyphIndexMap: any, lookupListIndexes: number[]): string[];
    static lookupTypeFlags(tag: string): FeatureType | undefined;
    static lookupRegisteredTags(tag: string): string | undefined;
    static _lookupData: RegisteredFeature[];
}