TypeScript tricks that prevent real bugs

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The problem

Most performance issues come from doing too much work on every request. Measure first, then fix the slowest part.

💡 Tip: profile in production-like conditions — your laptop lies.

The solution

Here is the core idea in a few lines of TypeScript:

type Status = 'draft' | 'paid' | 'void';

function label(s: Status): string {
  switch (s) {
    case 'draft': return 'Draft';
    case 'paid':  return 'Paid';
    case 'void':  return 'Void';
  }
}

⚠️ Warning: cache invalidation is the hard part — always set a TTL.

Results

• Response time dropped from 820 ms to 140 ms.
• Database load fell by 70%.
• No new infrastructure needed.

✅ Best practice: add a regression test so the slowdown never comes back.