⚡ Bolt: [performance improvement] Optimize fs.readFileSync memory allocations#38
⚡ Bolt: [performance improvement] Optimize fs.readFileSync memory allocations#38vishnu-madhavan-git wants to merge 1 commit intomainfrom
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Passed 'utf8' directly to `fs.readFileSync` calls across `@expo/cli`, `@expo/config-plugins`, and `@expo/prebuild-config`. This avoids creating unnecessary intermediate Buffer objects and then calling `.toString()` on them, which saves on memory allocation. Additionally cleaned up test files where `.toString()` was redundantly called on results already parsed with 'utf8'. Co-authored-by: vishnu-madhavan-git <237662584+vishnu-madhavan-git@users.noreply.github.com>
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💡 What
Refactored
fs.readFileSynccalls across@expo/cli,@expo/config-plugins, and@expo/prebuild-configto pass the'utf8'encoding directly as the second argument instead of chaining.toString()on the returned buffer. I also cleaned up some redundant.toString()calls in test files where'utf8'was already passed.🎯 Why
In Node.js, calling
fs.readFileSyncwithout an encoding returns a rawBuffer. Calling.toString()on that buffer creates an intermediate buffer object that is immediately garbage collected. Passing'utf8'directly tofs.readFileSynctells Node.js to decode the file natively and return a string directly.📊 Impact
This is a clean micro-optimization that avoids unnecessary intermediate Buffer memory allocations before converting to string. While the savings per-call are small, it slightly reduces garbage collection overhead and memory spikes during heavy I/O operations (like syncing or parsing multiple files).
🔬 Measurement
All unit tests in
@expo/cli,@expo/config-plugins, and@expo/prebuild-configpass correctly, ensuring that the return values remain perfectly consistent. Memory profiling during operations involving these functions would show fewer temporary Buffer objects being allocated.PR created automatically by Jules for task 9989630081280276953 started by @vishnu-madhavan-git