memfs

In-memory file-system with Node's fs API.
v4.17.2 URL: https://unpkg.com/memfs@4.17.2/lib/index.js
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fsfilesystemfs.jsmemory-fsmemfsfilefile systemmountmemoryin-memoryvirtualtesttestingmockfsafile system accessnative file systemwebfscrudfsopfscasfscontent addressable storage

memfs-browser

In-memory file-system with Node's fs API.
v3.5.10302 URL: https://unpkg.com/memfs-browser@3.5.10302/dist/memfs.js
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fsfilesystemfs.jsmemory-fsmemfsfilefile systemmountmemoryin-memoryvirtualtesttestingmock

@cowasm/memfs

In-memory file-system with Node's fs API.
v3.5.1 URL: https://unpkg.com/@cowasm/memfs@3.5.1/lib/index.js
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fsfilesystemfs.jsmemory-fsmemfsfilefile systemmountmemoryin-memoryvirtualtesttestingmock

fs-zoo

File system abstractions and implementations
v1.1.0 URL: https://unpkg.com/fs-zoo@1.1.0/lib/index.js
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fsfilesystemfs.jsmemory-fsfilefile systemmountmemoryin-memoryvirtualtesttestingmockfsafile system accessnative file systemwebfscrudfsopfscasfscontent addressable storage

@f0x52/spyfs

Filesystem spy
v1.1.0 URL: https://unpkg.com/@f0x52/spyfs@1.1.0/index.js
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fsspyfilesystemfs.jsfilefile systemtesttestingmock