streamich
unionfs
Creates a union of multiple fs file systems.
npm install --save unionfsThis module allows you to use multiple objects that have file system fs API at the same time.
import { ufs } from 'unionfs';
import { fs as fs1 } from 'memfs';
import * as fs2 from 'fs';
ufs.use(fs1).use(fs2);
ufs.readFileSync(/* ... */);Use this module with memfs and linkfs.
memfs allows you to create virtual in-memory file system. linkfs allows you to redirect fs paths.
You can also use other fs-like objects.
import * as fs from 'fs';
import { Volume } from 'memfs';
import * as MemoryFileSystem from 'memory-fs';
import { ufs } from 'unionfs';
const vol1 = Volume.fromJSON({ '/memfs-1': '1' });
const vol2 = Volume.fromJSON({ '/memfs-2': '2' });
const memoryFs = new MemoryFileSystem();
memoryFs.writeFileSync('/memory-fs', '3');
ufs.use(fs).use(vol1).use(vol2).use(memoryFs);
console.log(ufs.readFileSync('/memfs-1', 'utf8')); // 1
console.log(ufs.readFileSync('/memfs-2', 'utf8')); // 2
console.log(ufs.readFileSync('/memory-fs', 'utf8')); // 3You can create a Union instance manually:
import { Union } from 'unionfs';
var ufs1 = new Union();
ufs1.use(fs).use(vol);
var ufs2 = new Union();
ufs2.use(fs).use(/*...*/);License
Unlicense - public domain.