ECO-CMP-JS-001 — Synchronous filesystem calls in request path¶

Category: Computation (CMP)
Family: JavaScript (JS)
Layer: Code
Tier: 2
Severity: error
Tags: javascript, node, blocking
Legacy ID: ECO-JS-001

Summary¶

Sync FS calls block the event loop and reduce concurrency.

One blocking FS call can stall all concurrent requests in the same process.

{
  "confidence": 0.9,
  "notes": "High propagation in Node services.",
  "type": "latency"
}

{
  "languages": [
    "javascript"
  ],
  "method": "ast"
}

{
  "guidance": "Use async fs APIs (promises/callbacks).",
  "tradeoffs": "Refactor required."
}

{
  "system_layers": [
    "code"
  ]
}