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⚡ Bolt: [Async File Read Opt] Replace fs.readFileSync with fs.promises.readFile#47

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⚡ Bolt: [Async File Read Opt] Replace fs.readFileSync with fs.promises.readFile#47
badMade wants to merge 1 commit into
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bolt-perf-readFile-6975480132466791047

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@badMade badMade commented May 23, 2026

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💡 What:
Replaced fs.readFileSync with await fs.promises.readFile inside loadOpenApiSpec in src/init-server.ts.

🎯 Why:
Using synchronous file I/O operations (fs.readFileSync) blocks the main Node.js event loop. While init-server.ts handles the initialization "cold path", adopting asynchronous non-blocking file reads (fs.promises.readFile) is a standard best practice to prevent the application from stalling when starting up, especially as OpenAPI specification file sizes increase.

📊 Impact:
Eliminates synchronous I/O blocking during the OpenAPI specification file parsing, allowing the server to handle other pending events simultaneously while initializing.

🔬 Measurement:

  1. Build the server using npm run build.
  2. Start the server using npm run dev.
  3. Notice that the server starts successfully without throwing errors and non-blocking I/O is utilized for file parsing. I have verified tests (npx vitest run) and built successfully.

PR created automatically by Jules for task 6975480132466791047 started by @badMade

Replaces the synchronous `fs.readFileSync` in `src/init-server.ts` with the asynchronous `fs.promises.readFile` inside `loadOpenApiSpec`. This prevents the event loop from being blocked while loading the OpenAPI specification file.

Co-authored-by: google-labs-jules[bot] <161369871+google-labs-jules[bot]@users.noreply.github.com>
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Code Review

This pull request updates the file reading logic in src/init-server.ts from a synchronous to an asynchronous approach using fs.promises.readFile to prevent blocking the event loop. It also adds a corresponding entry to the .jules/bolt.md log. The review feedback suggests removing a redundant and branded comment from the code to maintain a cleaner codebase.

Comment thread src/init-server.ts
Comment on lines +20 to +21
// ⚡ Bolt Optimization: Use async readFile instead of readFileSync to avoid blocking the event loop during initialization
rawSpec = await fs.promises.readFile(path.resolve(process.cwd(), specPath), 'utf-8')

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medium

The comment added on line 20 is redundant and contains branding ('⚡ Bolt Optimization') which is unnecessary in the source code. The code itself is self-explanatory as it clearly indicates an asynchronous file read operation. Removing this comment will keep the codebase cleaner and more maintainable.

Suggested change
// ⚡ Bolt Optimization: Use async readFile instead of readFileSync to avoid blocking the event loop during initialization
rawSpec = await fs.promises.readFile(path.resolve(process.cwd(), specPath), 'utf-8')
rawSpec = await fs.promises.readFile(path.resolve(process.cwd(), specPath), 'utf-8')

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