import { BaseFeatureDataAdapter } from '@jbrowse/core/data_adapters/BaseAdapter';
import type { BaseOptions, BaseSequenceAdapter } from '@jbrowse/core/data_adapters/BaseAdapter';
import type { Feature, Region } from '@jbrowse/core/util';
export default class GCContentAdapter extends BaseFeatureDataAdapter {
    private gcMode;
    static capabilities: string[];
    configure(): Promise<BaseSequenceAdapter>;
    getRefNames(opts?: BaseOptions): Promise<string[]>;
    private calculateGCContent;
    getFeatures(query: Region, opts?: BaseOptions): import("rxjs").Observable<Feature>;
}