/**
 * The name of the ESI (EtherCAT Slave Information) file.
 */
export declare const esiFilename = "SOMANET_CiA_402.xml";
/**
 * The name of the zipped ESI file as it is stored inside a firmware package and on the device flash memory.
 */
export declare const esiZipFilename = "SOMANET_CiA_402.xml.zip";
/**
 * Extracts the unzipped ESI file ({@link esiFilename}) content from a firmware package.
 *
 * A firmware package is a ZIP archive that typically contains {@link esiZipFilename}
 * (a ZIP wrapping {@link esiFilename}), the firmware binaries, the SII file, and other assets such as
 * `stack_image.svg.zip`. This function unzips the package, then unzips the nested {@link esiZipFilename},
 * and returns the raw XML bytes. Only the ESI entries are decompressed; the firmware binaries are skipped.
 *
 * The returned content matches what Motion Master returns when reading the file from a device, where the
 * zipped file is automatically unzipped. This means it can be stored in IndexedDB just like the read-time
 * caching in `getDeviceFile` does, allowing the ESI to be resolved locally without writing it to the drive.
 *
 * @param firmwarePackageContent - The firmware package ZIP archive content.
 * @returns The unzipped ESI XML bytes, or `null` if the package does not contain an ESI file
 *          (for example, an empty firmware package).
 */
export declare function extractEsiFromFirmwarePackage(firmwarePackageContent: Uint8Array): Uint8Array | null;