Dead code and unused exports eliminated

Commented-out code blocks and abandoned files (api-old.ts, utils.backup.ts) create ambiguity about which implementation is authoritative and inflate the mental model required to understand the codebase. ISO 25010:2011 §6.5.2 classifies this as a maintainability defect. For AI-built projects, the risk is compounded: a new coding session may incorrectly treat the abandoned code as the canonical version and reintroduce bugs that were already fixed in the active implementation.

Delete dead code — version control history preserves it if you ever need it back. Enable TypeScript compiler flags to catch unused variables and parameters automatically:

{
  "compilerOptions": {
    "noUnusedLocals": true,
    "noUnusedParameters": true
  }
}

For unused exports across the entire project, run:

npx ts-unused-exports tsconfig.json

For commented-out code blocks, configure an ESLint rule or use a pre-commit hook that flags multi-line comment blocks containing what looks like executable code.