/// <reference types="node" />
import { PolyfillBuffer } from '@polyfill-io-aot/core/src/PolyfillBuffer';
import * as EventEmitter from 'events';
import * as moment from 'moment';
import { Compression } from './Compression';
import { PolyfillCoreConfig } from './PolyfillCoreConfig';
/** Framework-agnostic polyfill consumer */
export declare class PolyfillIoAot extends EventEmitter {
    /** Event name for when a polyfill bundle cannot be found */
    static readonly POLYFILL_NOT_FOUND = "POLYFILL_IO_AOT_POLYFILL_NOT_FOUND";
    /**
     * Constructor
     * @param cfg Partial polyfill configuration
     */
    constructor(cfg?: Partial<PolyfillCoreConfig>);
    /** The lastModified value from the manifest */
    readonly lastModified: string;
    private readonly conf;
    private readonly features;
    private readonly lastModifiedAsMoment;
    private readonly manifest;
    /**
     * Get the polyfills for the given compression level and user agent
     * @param uaString User agent string
     * @param [compression=Compression.NONE] Compression level
     */
    getPolyfills(uaString: string, compression?: Compression): Promise<PolyfillBuffer>;
    /** Check whether the given ETag was bundled */
    hasEtag(eTag: string): boolean;
    /** Check whether the bundle has been modified since the given date */
    modifiedSince(since: moment.MomentInput): boolean;
    private generatePolyfills;
    private onGetPolyfills;
    private onHashFound;
}