⚡ Bolt: Use EAFP pattern in writeFile to reduce syscalls#2782
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📝 WalkthroughWalkthroughRemoves runtime checks that prevented writing to directory paths in Changes
Estimated code review effort🎯 2 (Simple) | ⏱️ ~10 minutes Possibly related PRs
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Acknowledging duplicate status. Stopping work on this task.
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Optimizes `writeFile` and `writeFileAsync` in `packages/utils` by removing the explicit `lstat` check for directories before writing. Instead, it relies on the underlying `fs` write operation to throw `EISDIR` if the target is a directory. This saves one syscall per write operation. - Removes `isDirectory` and `isDirectoryAsync` checks. - Updates `writeFile` to catch filesystem errors naturally. - Maintains backward compatibility by ensuring errors are still wrapped in `FileOperationError` (via `handleWriteError`). - Verified with existing tests.
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@greptile |
Greptile SummaryRefactored
Confidence Score: 5/5
Important Files Changed
Sequence DiagramsequenceDiagram
participant Caller
participant writeFile
participant resolveTargetFile
participant validateContent
participant writeFileSync
participant handleWriteError
participant FileOperationError
Caller->>writeFile: writeFile({file, content, index})
activate writeFile
writeFile->>resolveTargetFile: resolveTargetFile(file, index)
activate resolveTargetFile
alt Invalid file
resolveTargetFile-->>writeFile: throw ValidationError
else Valid file
resolveTargetFile-->>writeFile: targetFile
end
deactivate resolveTargetFile
writeFile->>validateContent: validateContent(content)
activate validateContent
alt Empty content
validateContent-->>writeFile: throw ValidationError
else Valid content
validateContent-->>writeFile: void
end
deactivate validateContent
Note over writeFile,writeFileSync: EAFP: Try write without pre-check
writeFile->>writeFileSync: writeFileSync(targetFile, content, encoding)
activate writeFileSync
alt Target is directory (EISDIR)
writeFileSync-->>writeFile: throw EISDIR error
writeFile->>handleWriteError: handleWriteError(error, file)
activate handleWriteError
handleWriteError->>FileOperationError: new FileOperationError("write to", file, error)
FileOperationError-->>handleWriteError: wrapped error
handleWriteError-->>Caller: throw FileOperationError
deactivate handleWriteError
else Write succeeds
writeFileSync-->>writeFile: success
writeFile-->>Caller: return content
end
deactivate writeFileSync
deactivate writeFile
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⚠️ Outside diff range comments (1)
packages/utils/src/writeFile.ts (1)
51-55: Update JSDoc to match EAFP behavior.The description still says the function “ensures the target is not a directory,” which is no longer true after removing the pre-check. Please update the comment to reflect that directory targets now fail via the underlying write error.
✏️ Suggested JSDoc update
- * Resolves the target from `file` (string or array) using `index` when provided, validates the content, - * ensures the target is not a directory, and writes the content to disk. + * Resolves the target from `file` (string or array) using `index` when provided, validates the content, + * and writes the content to disk; directory targets will fail via the underlying write error.
Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## develop #2782 +/- ##
===========================================
- Coverage 99.37% 99.37% -0.01%
===========================================
Files 63 63
Lines 1290 1277 -13
Branches 393 391 -2
===========================================
- Hits 1282 1269 -13
Misses 8 8 ☔ View full report in Codecov by Sentry. 🚀 New features to boost your workflow:
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1 participant
⚡ Bolt: Use EAFP pattern in writeFile to reduce syscalls
💡 What: Removed the explicit
lstatcheck (isDirectory) before writing files inpackages/utils.🎯 Why: Checking for existence/directory before writing ("Look Before You Leap") adds an unnecessary system call. By just attempting the write ("Easier to Ask for Forgiveness than Permission"), we save one syscall in the happy path (writing to a file).
📊 Impact: Reduces overhead for every file write operation by 1 syscall. In scenarios with many small file writes, this reduces I/O latency.
🔬 Measurement: Verified that writing to a directory still throws an error (EISDIR) and is correctly handled/wrapped by the existing error handling logic. Existing tests passed.
PR created automatically by Jules for task 13295786206695180100 started by @srod
Summary by cubic
Switch writeFile and writeFileAsync to EAFP by removing pre-write lstat checks and letting fs writes fail if the target is a directory. This saves one syscall per write and reduces I/O overhead while keeping error behavior the same.
Written for commit 4c922b4. Summary will update on new commits.
Summary by CodeRabbit
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