Engineering insights · Authors

Leo·Source team

Ukrainian developers and QA engineers working across JavaScript, TypeScript, React, Next.js, Node.js and cloud infrastructure.

This collective byline identifies articles published by our engineering team. Individual developer profiles describe the people, roles and experience behind Leo·Source.

Articles by the team

• React 19 Actions: forms, useActionState and useOptimistic

  2026-08-18

• TypeScript 7: what the native compiler changes in practice

  2026-07-14

• React Compiler 1.0 in practice: do you still need useMemo?

  2026-06-09

• Upgrading to Next.js 16: proxy.ts, Turbopack and async params

  2026-05-12

• Modern JavaScript you can use now: iterator helpers, Set methods and more

  2026-04-14

• TypeScript 6.0: the bridge release before the native compiler

  2026-03-26

• CSS container queries: components that respond to their own space

  2026-03-03

• React 19.2: Activity and useEffectEvent

  2026-02-24

• Temporal: JavaScript dates, finally fixed

  2026-02-10

• Next.js 16 Cache Components: explicit caching with use cache

  2026-01-20