/**
 * Copyright 2021 Google LLC
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/**
 * A class that allows loading of a zip file to extract the relevant data we need from a zip.
 */
export declare class Zip {
    private zip;
    private entries;
    private signedFile;
    private previouslySigned;
    /**
     *
     * @param zip - A JSZip object of our project so we can load the zip entries.
     */
    private constructor();
    /**
     *
     * @returns An array of bundle entries contained within the zip file.
     */
    private getManifestEntries;
    /**
     * This statically generates a Zip class so we can analyze the data within the class. This method
     * is the only way to generate a Zip object.
     *
     * @param zipBlob - A zip blob.
     * @returns The Zip class.
     */
    static loadAsync(zipBlob: Blob): Promise<Zip>;
    /**
     * Generates a signed files class
     *
     * @param creator - Specifies the creator of the signed files.
     * @returns SignedFiles class.
     */
    private getSignedFiles;
    /**
     *
     * @returns An array of bundle entries within the zip.
     */
    private getEntries;
    /**
     *
     * @param creator - The entity used to generate the signed files class.
     * @returns The manifest file as a string.
     */
    generateManifest(creator: string): Promise<string>;
    /**
     *
     * @param creator - The entity used to generate the signed files class.
     * @returns The signature file as a string.
     */
    generateSignatureFile(creator: string): Promise<string>;
    /**
     * Adds a file to the zip filewithout any additional decompression and does not generate missing
     * folders.
     *
     * @param fileContents - The file contents to be added to the zip. These contents can either be
     *  base64 encoded string or a blob.
     * @param path - The path to the file contents.
     * @param isbase64 - Specifiying whether the data to be stored is a base 64 encoded string or not
     */
    addFileToZip(fileContents: Blob | string, path: string, isbase64?: boolean): void;
    /**
     *
     * @returns The zip file as a base64 encoded string for easy downloading.
     */
    exportZipAsBase64(): Promise<string>;
    /**
     * This zip aligns a zip file that is in the form of an arraybuffer. This
     *  zip aligns to the 32 bit page boundary by default.
     * @param zipBuffer - ArrayBuffer representing a zip file
     * @returns a zip Blob.
     */
    private alignZip;
    isPreviouslySigned(): boolean;
}