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2.10Key Takeaways
- TypeScript adds type safety that catches test bugs at compile time
- Node.js 24 LTS runs
.tsfiles directly via type-stripping -- but it does not type-check, so keeptsc --noEmitin CI - Jest for unit/API tests, Playwright for E2E, Cypress for component + E2E
- Learn at least one framework deeply; be able to read code in the others
- Use data-testid attributes for reliable element selection
- Playwright's auto-waiting eliminates most flakiness from E2E tests