/**
 * ClassDefTable maps glyph IDs to class values. It is used in GPOS and GSUB tables.
 */
export declare class ClassDefTable {
    private readonly format;
    private readonly classValueArray?;
    private readonly classRangeRecords?;
    private lookupCache;
    /**
     * Reads a ClassDefTable from the given DataView.
     */
    static read(data: DataView): ClassDefTable;
    private constructor();
    /**
     * Looks up the class value for a given glyph ID.
     */
    lookup(glyphID: number): number | undefined;
    private _lookup;
}