Everything You Need to Know About React 19
summary
React 19 RC brings concrete changes: React Actions provide async form handlers that return state and remove manual pending flags (form data arrives as a FormData object, access via .get); React Compiler auto‑memoizes to skip child renders and expensive calculations so useMemo/useCallback become largely unnecessary; useFormStatus yields pending/data/method/action and must live inside a form child; useActionState wires a form to an async action and returns updated state. ref now behaves as a normal prop and upgrade is via npm install react@beta or 19 RC.
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chapters (10)
- 0:00Introduction
- 1:48React 19 RC overview
- 3:13What’s new in React 19
- 5:05React Actions for forms
- 8:38React Compiler benefits
- 12:56New hooks in React 19
- 16:27Changes in refs and APIs
- 18:32Demo: React 19 forms
- 23:51Highlights and recap
- 24:39Encouragement for speakers
