react v16.9.0

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react v16.9.0 Release Notes

• React

  • ➕ Add <React.Profiler> API for gathering performance measurements programmatically. (@bvaughn in #15172)
  • Remove unstable_ConcurrentMode in favor of unstable_createRoot. (@acdlite in #15532)

  React DOM

  • 🗄 Deprecate old names for the UNSAFE_* lifecycle methods. (@bvaughn in #15186 and @threepointone in #16103)
  • 🗄 Deprecate javascript: URLs as a common attack surface. (@sebmarkbage in #15047)
  • 🗄 Deprecate uncommon "module pattern" (factory) components. (@sebmarkbage in #15145)
  • ➕ Add support for the disablePictureInPicture attribute on <video>. (@eek in #15334)
  • ➕ Add support for onLoad event for <embed>. (@cherniavskii in #15614)
  • ➕ Add support for editing useState state from DevTools. (@bvaughn in #14906)
  • ➕ Add support for toggling Suspense from DevTools. (@gaearon in #15232)
  • 👀 Warn when setState is called from useEffect, creating a loop. (@gaearon in #15180)
  • 🛠 Fix a memory leak. (@paulshen in #16115)
  • 🛠 Fix a crash inside findDOMNode for components wrapped in <Suspense>. (@acdlite in #15312)
  • 🛠 Fix pending effects from being flushed too late. (@acdlite in #15650)
  • 🛠 Fix incorrect argument order in a warning message. (@brickspert in #15345)
  • 🛠 Fix hiding Suspense fallback nodes when there is an !important style. (@acdlite in #15861 and #15882)
  • 🐎 Slightly improve hydration performance. (@bmeurer in #15998)

  React DOM Server

  • 🛠 Fix incorrect output for camelCase custom CSS property names. (@bedakb in #16167)

  ✅ React Test Utilities and Test Renderer

  • ➕ Add act(async () => ...) for testing asynchronous state updates. (@threepointone in #14853)
  • ➕ Add support for nesting act from different renderers. (@threepointone in #16039 and #16042)
  • ⏱ Warn in Strict Mode if effects are scheduled outside an act() call. (@threepointone in #15763 and #16041)
  • Warn when using act from the wrong renderer. (@threepointone in #15756)

  👕 ESLint Plugin: React Hooks

  • Report Hook calls at the top level as a violation. (gaearon in #16455)

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