Breaking Changes

• Drop IE11 support ((major) - Tracking PR for v11 #4549, thanks @JoviDeCroock)
• Move defaultProps into preact/compat (Move defaultProps into preact/compat #4657, thanks @JoviDeCroock)
• Remove automatic px suffix (Remove automatic px suffix #4665, thanks @JoviDeCroock)
• Remove contains with a simple parentNode check (Remove contains with a simple parentNode check #4666, thanks @JoviDeCroock)
• Remove component.base ((major) - Tracking PR for v11 #4549, thanks @JoviDeCroock)
• Remove SuspenseList (Remove SuspenseList mechanism #4668, thanks @JoviDeCroock)
• Remove static dom bail (Remove static dom bail #4670, thanks @JoviDeCroock)
• Breaking changes to outputs & pkg.json (refactor: Breaking changes to outputs & pkg.json #4652, thanks @rschristian)
• Drop support for TS versions < 5.1 (refactor: Drop support for TS versions < 5.1 #4788, thanks @rschristian)
• Remove all export maps in nested pkg.json files (refactor (v11): Remove all export maps in nested pkg.json files #4784, thanks @rschristian)
• Remove deprecated 'ForwardFn' type from compat (refactor (v11): Remove deprecated 'ForwardFn' type from compat #4777, thanks @rschristian)

Features

• Comment denoted hydration (Comment denoted hydration #4636, thanks @JoviDeCroock)
• Forward ref by default (Forward ref by default #4658, thanks @JoviDeCroock)
• Add captureOwnerStack (feat(debug): add captureOwnerStack #4875, thanks @colinaaa)
• Add context argument to compat/Children map api (Adapt to React api: add context argument to compat/Children map api #3855, thanks @ParSal123)
• Export helper functions from preact/debug (fix: export helper functions from preact/debug #4830, thanks @colinaaa)
• Export test-utils from compat (Export test-utils from compat #4783, thanks @rawrmonstar)

Types

• Require initial value in useRef (types: Require initial value in useRef #4683, thanks @rschristian)
• Types w/ module augmentation (fix: Types w/ module augmentation #4884, thanks @rschristian)
• Fix outdated public RefCallback type (Fix outdated public RefCallback type #4801, thanks @developit)
• Export IntrinsicHTMLElements interface (Export IntrinsicHTMLElements interface #4885, thanks @edoardocavazza)
• Avoid breaking change for ARIA element types (refactor: Avoid breaking change for ARIA element types #4882, thanks @rschristian)
• Move most interfaces out of the JSX namespace (refactor: Move most interfaces out of the JSX namespace #4878, thanks @rschristian)
• Make HTMLAttribute type declarations consistent (refactor: Make HTMLAttribute type declarations consistent #4876, thanks @rschristian)
• Restrict aria roles by element type (refactor: Restrict aria roles by element type #4607, thanks @rschristian)
• Add types for '/compat/server' & '/compat/scheduler' (types: Add types for '/compat/server' & '/compat/scheduler' #4835, thanks @rschristian)

Fixes

• Ensure memoized components re-render after errors (Ensure memoized components re-render after errors #4880, thanks @JoviDeCroock)
• Provide solution to long standing memleak (Provide solution to long standing memleak #4853, thanks @JoviDeCroock)
• Ensure we properly re-render bailing errored children (Ensure we properly re-render bailing errored children #4857, thanks @JoviDeCroock)
• Support alternative contentDocument (Support alternative contentDocument #4851, thanks @JoviDeCroock)
• Fix memory leak in VNode owner tracking (fix(debug): fix memory leak in VNode owner tracking #4850, thanks @developit)
• Ensure 'compat/test-utils' exports match & are valid (fix: Ensure 'compat/test-utils' exports match & are valid #4834, thanks @rschristian)
• Fix signal attribute values not working with precompile transform (fix: signal attribute values not working with precompile transform #4799, thanks @marvinhagemeister)
• Fix escape style object value in precompile transform (fix: escape style object value in precompile transform #4794, thanks @marvinhagemeister)
• Fix _listeners mangle to reduce collisions (fix: _listeners mangle to reduce collisions #4463, thanks @rschristian)

Performance

• Do not re-insert memoized vnodes that keep their relative order after swap (Do not re-insert memoized vnodes that keep their relative order after swap #4888, thanks @vasylenkoval)
• Call tolowercase only when needed (Call tolowercase only when needed #4881, thanks @JoviDeCroock)
• Reduce some repeated logic (perf: reduce some repeated logic #4814, thanks @43081j)
• Golf down suspense (Golf down suspense #4855, thanks @JoviDeCroock)
• Add flags for component type (Add flags for component type #4867, thanks @JoviDeCroock)

Refactors

• DOM event name casing (refactor: DOM event name casing #4843, thanks @rschristian)
• Improve accuracy of non-dimensional regex (refactor (v11): Improve accuracy of non-dimensional regex #4772, thanks @rschristian)
• Skip dom check for inferring lower-cased event names (refactor: Skip dom check for inferring lower-cased event names #4720, thanks @rschristian)
• Prune portal logic (Prune portals #4667, thanks @JoviDeCroock)
• Switch to Object.is for hook args (refactor: Switch to Object.is for hook args #4663, thanks @rschristian)
• Remove rerendercount (Remove rerendercount #4877, thanks @JoviDeCroock)

Testing & Development

• Bump testing/transpilation/formatting deps (Bump testing/transpilation/formatting deps #4858, thanks @JoviDeCroock)
• Upgrade oxlint to 1.8.0, fix errors (chore(deps): upgrade oxlint to 1.8.0, fix errors #4848, thanks @camc314)
• Add simple test for unstable_batchedUpdate to improve coverage (test: Add simple test for unstable_batchedUpdate to improve coverage #4842, thanks @rschristian)
• Correct PR reporter filter for forks (ci: Correct PR reporter filter for forks #4828, thanks @rschristian)
• Remove sinon (chore: remove sinon #4820, thanks @43081j)
• Migrate compat tests to vitest spies (test: migrate compat tests to vitest spies #4819, thanks @43081j)
• Migrate debug tests to vitest spies (test: migrate debug tests to vitest spies #4817, thanks @43081j)
• Migrate hooks tests to vitest spies (test: migrate hooks tests to vitest spies #4816, thanks @43081j)
• Migrate lifecycle tests to use vitest spies (test: migrate lifecycle tests to use vitest spies #4815, thanks @43081j)
• Migrate events/refs tests to vitest spies (test: migrate events/refs tests to vitest spies #4813, thanks @43081j)
• Migrate more browser tests to use vitest spies (test: migrate more browser tests to use vitest spies #4812, thanks @43081j)
• Migrate context tests to vitest spies (test: migrate context tests to vitest spies #4810, thanks @43081j)
• Migrate createContext test to use vitest spies (test: migrate createContext test to use vitest spies #4811, thanks @43081j)
• Migrate components tests to vitest spies (test: migrate components tests to vitest spies #4809, thanks @43081j)
• Use v8 coverage (chore: use v8 coverage #4807, thanks @43081j)
• Switch to playwright for browser tests (chore: switch to playwright for browser tests #4808, thanks @43081j)
• Migrate from mocha to vitest (chore: migrate from mocha to vitest #4806, thanks @43081j)
• Add test ensuring effects are cleaned up (Add test ensuring effects are cleaned up #4792, thanks @JoviDeCroock)
• Avoid caching so file-saves work first try (Avoid caching so file-saves work first try #4786, thanks @JoviDeCroock)
• Bump browserslist (chore: Bump browserslist #4785, thanks @rschristian)
• Specify target browsers (chore: Specify target browsers #4773, thanks @rschristian)
• Remove extraneous pkg.json key (chore: Remove extraneous pkg.json key #4789, thanks @rschristian)
• Drop unused/broken test (test: Drop unused/broken test #4653, thanks @rschristian)