⚡ Bolt: [performance improvement] avoid intermediate buffer allocations in readFileSync#29
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Replaced `fs.readFileSync(...).toString()` with `fs.readFileSync(..., 'utf8')` in multiple packages across the monorepo to avoid intermediate buffer allocation. Co-authored-by: vishnu-madhavan-git <237662584+vishnu-madhavan-git@users.noreply.github.com>
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💡 What
Replaced instances of
fs.readFileSync(...).toString()withfs.readFileSync(..., 'utf8')across multiple files in the@expo/cli,@expo/config-plugins,pod-install, andexpo-brownfieldpackages.🎯 Why
When reading files in Node.js,
fs.readFileSyncwithout an encoding parameter allocates aBuffercontaining the raw file bytes. Calling.toString()on this result allocates a new string from that buffer. By passing'utf8'directly tofs.readFileSync, Node.js decodes the file into a string internally, entirely skipping the intermediate V8Bufferallocation. This reduces garbage collection overhead and memory footprint, especially when reading many files or large files (e.g., config templates, gitignores).📊 Impact
Measurably reduces memory allocation and garbage collection overhead during CLI, plugin execution, and template reading operations without sacrificing code readability. It's a standard, highly-recommended Node.js micro-optimization for synchronous file I/O.
🔬 Measurement
Run
yarn testacross the monorepo to ensure everything still passes (already verified). Since the default encoding forBuffer.prototype.toString()is'utf8', the behavior is identical. Profiling heap usage during heavy CLI operations will show reducedBufferallocations.PR created automatically by Jules for task 3240333714337371232 started by @vishnu-madhavan-git