method ZipDirectoryEntry.prototype.addFileSystemEntryimport { ZipDirectoryEntry } from "https://dotland.deno.dev/x/zipjs@v2.7.4/index.js"; addFileSystemEntry(fileSystemEntry: FileSystemEntry, options?: ZipWriterAddDataOptions): Promise<ZipEntry>Adds an entry with content provided via a FileSystemEntry instance Adds an entry with content provided via a FileSystemEntry instance ParametersfileSystemEntry: FileSystemEntryThe FileSystemEntry instance. optionaloptions: ZipWriterAddDataOptionsThe options. ReturnsPromise<ZipEntry>A promise resolving to a ZipFileEntry or a ZipDirectoryEntry instance.