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mock-fs performs deep mocking on node/fs internals which seems to be rather brittle. And it's broken on Node 20.8.0+ right now.
Based on the changelog at https://github.com/nodejs/node/blob/main/doc/changelogs/CHANGELOG_V20.md#2023-09-28-version-2080-current-ruyadorno , I am guessing it's some of the changes such as nodejs/node#49593 or nodejs/node#49691
Replaced here with
mock-tmp
, a simple library that keeps roughly the same API asmock-fs
for ease of migration, but uses real files on the filesystem.