LibFs.buildFileForContract calls vm.writeFile directly, and vm.writeFile does not create parent directories. So a repo that has never generated — no src/generated on disk — cannot run its build:
vm.writeFile: failed to open file ".../src/generated/ReproFresh.sol": No such file or directory (os error 2)
vm.isDir("src/generated") is false at that point, so the permission check passes and only the write fails. The error names neither the missing directory nor the fix.
This is the first-run path for every consumer of this package. It is invisible here because src/generated is committed in this repo.
Triage framing
It may be intended that a consumer creates the directory themselves, or that src/generated is always committed so the case never arises in practice. Against that: nothing documents the requirement, the failure is an OS-level error rather than a stated precondition, and vm.createDir(dir, true) before the write is one line inside the function that already owns file placement.
LibFs.buildFileForContractcallsvm.writeFiledirectly, andvm.writeFiledoes not create parent directories. So a repo that has never generated — nosrc/generatedon disk — cannot run its build:vm.isDir("src/generated")isfalseat that point, so the permission check passes and only the write fails. The error names neither the missing directory nor the fix.This is the first-run path for every consumer of this package. It is invisible here because
src/generatedis committed in this repo.Triage framing
It may be intended that a consumer creates the directory themselves, or that
src/generatedis always committed so the case never arises in practice. Against that: nothing documents the requirement, the failure is an OS-level error rather than a stated precondition, andvm.createDir(dir, true)before the write is one line inside the function that already owns file placement.