memfs implements the web File System Access (FSA) API (formerly known as
Native File System API) on top of Node's fs-like filesystem API. This means you
can instantiate an FSA-compatible API on top of Node.js fs module,
or on top of memfs in-memory filesystem, or on top of any
other filesystem that implements Node's fs API.
Crate a FileSystemDirectoryHandle out
of any folder on your filesystem:
import { nodeToFsa } from 'memfs/lib/node-to-fsa';
const dir = nodeToFsa(fs, '/path/to/folder', { mode: 'readwrite' });The fs Node filesystem API can be the real fs module or any fs like object, for example,
an in-memory one provided by memfs.
Now you can use the dir handle to execute all the File System Access API
methods, for example, create a new file:
const file = await dir.getFileHandle('foo.txt', { create: true });