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5dc60f13c3
This fixes a few error surfaced by adding `"strict": true` to `tsconfig.json`. * `_callFs(fs.readdir, /* ... */)` needs explicit types because `fs.readdir` has a few overloads, which was confusing type inference. * `TempScopedNodeJsSyncHost._sync` is an uninitialized property, but it was already being checked for `undefined`, so I simply made its type optional. * `TempScopedNodeJsSyncHost.files` had an incorrect type assertion, but was otherwise correct. I just removed the assertion and let type inference do the trick.