react/promise

• Feature: Improve PHP 8.5+ support by avoiding deprecated switch case syntax.
  (#264 by @theodorejb)

• Feature: Run tests on PHP 8.4 and update test environment.
  (#271 by @clue)

• Feature: Improve PHP 8.4+ support by avoiding implicitly nullable type declarations.
  (#260 by @Ayesh)

• Feature: Include previous exceptions when reporting unhandled promise rejections.
  (#262 by @clue)

• Update test suite to improve PHP 8.4+ support.
  (#261 by @SimonFrings)

• Feature: Improve PHP 8.4+ support by avoiding implicitly nullable type declarations. (#260 by @Ayesh)

• Feature: Include previous exceptions when reporting unhandled promise rejections. (#262 by @clue)

• Update test suite to improve PHP 8.4+ support. (#261 by @SimonFrings)

• Feature: Full PHP 8.3 compatibility.
  (#255 by @clue)

• Feature: Describe all callable arguments with types for Promise and Deferred.
  (#253 by @clue)

• Update test suite and minor documentation improvements.
  (#251 by @ondrejmirtes and #250 by @SQKo)

• Feature: Full PHP 8.3 compatibility. (#255 by @clue)

• Feature: Describe all callable arguments with types for Promise and Deferred. (#253 by @clue)

• Update test suite and minor documentation improvements. (#251 by @ondrejmirtes and #250 by @SQKo)

A major new feature release, see release announcement.

• We'd like to emphasize that this component is production ready and battle-tested.
  We plan to support all long-term support (LTS) releases for at least 24 months,
  so you have a rock-solid foundation to build on top of.

• The v3 release will be the way forward for this package. However, we will still
  actively support v2 and v1 to provide a smooth upgrade path for those not yet
  on the latest versions.

This update involves some major new features and a minor BC break over the
v2.0.0 release. We've tried hard to avoid BC breaks where possible and
minimize impact otherwise. We expect that most consumers of this package will be
affected by BC breaks, but updating should take no longer than a few minutes.
See below for more details:

• BC break: PHP 8.1+ recommended, PHP 7.1+ required.
  (#138 and #149 by @WyriHaximus)

• Feature / BC break: The PromiseInterface now includes the functionality of the old ExtendedPromiseInterface and CancellablePromiseInterface.
  Each promise now always includes the then(), catch(), finally() and cancel() methods.
  The new catch() and finally() methods replace the deprecated otherwise() and always() methods which continue to exist for BC reasons.
  The old ExtendedPromiseInterface and CancellablePromiseInterface are no longer needed and have been removed as a consequence.
  (#75 by @jsor and #208 by @clue and @WyriHaximus)

  // old (multiple interfaces may or may not be implemented)
  assert($promise instanceof PromiseInterface);
  assert(method_exists($promise, 'then'));
  if ($promise instanceof ExtendedPromiseInterface) { assert(method_exists($promise, 'otherwise')); }
  if ($promise instanceof ExtendedPromiseInterface) { assert(method_exists($promise, 'always')); }
  if ($promise instanceof CancellablePromiseInterface) { assert(method_exists($promise, 'cancel')); }
  
  // new (single PromiseInterface with all methods)
  assert($promise instanceof PromiseInterface);
  assert(method_exists($promise, 'then'));
  assert(method_exists($promise, 'catch'));
  assert(method_exists($promise, 'finally'));
  assert(method_exists($promise, 'cancel'));

• Feature / BC break: Improve type safety of promises. Require mixed fulfillment value argument and Throwable (or Exception) as rejection reason.
  Add PHPStan template types to ensure strict types for resolve(T $value): PromiseInterface<T> and reject(Throwable $reason): PromiseInterface<never>.
  It is no longer possible to resolve a promise without a value (use null instead) or reject a promise without a reason (use Throwable instead).
  (#93, #141 and #142 by @jsor, #138, #149 and #247 by @WyriHaximus and #213 and #246 by @clue)

  // old (arguments used to be optional)
  $promise = resolve();
  $promise = reject();
  
  // new (already supported before)
  $promise = resolve(null);
  $promise = reject(new RuntimeException());

• Feature / BC break: Report all unhandled rejections by default and remove done() method.
  Add new set_rejection_handler() function to set the global rejection handler for unhandled promise rejections.
  (#248, #249 and #224 by @clue)

  // Unhandled promise rejection with RuntimeException: Unhandled in example.php:2
  reject(new RuntimeException('Unhandled'));

• BC break: Remove all deprecated APIs and reduce API surface.
  Remove some(), map(), reduce() functions, use any() and all() functions instead.
  Remove internal FulfilledPromise and RejectedPromise classes, use resolve() and reject() functions instead.
  Remove legacy promise progress API (deprecated third argument to then() method) and deprecated LazyPromise class.
  (#32 and #98 by @jsor and #164, #219 and #220 by @clue)

• BC break: Make all classes final to encourage composition over inheritance.
  (#80 by @jsor)

• Feature / BC break: Require array (or iterable) type for all() + race() + any() functions and bring in line with ES6 specification.
  These functions now require a single argument with a variable number of promises or values as input.
  (#225 by @clue and #35 by @jsor)

• Fix / BC break: Fix race() to return a forever pending promise when called with an empty array (or iterable) and bring in line with ES6 specification.
  (#83 by @jsor and #225 by @clue)

• Minor performance improvements by initializing Deferred in the constructor and avoiding call_user_func() calls.
  (#151 by @WyriHaximus and #171 by @Kubo2)

• Minor documentation improvements.
  (#110 by @seregazhuk, #132 by @CharlotteDunois, #145 by @danielecr, #178 by @WyriHaximus, #189 by @SrDante, #212 by @clue, #214, #239 and #243 by @SimonFrings and #231 by @nhedger)

The following changes had to be ported to this release due to our branching
strategy, but also appeared in the 2.x branch:

• Feature: Support union types and address deprecation of ReflectionType::getClass() (PHP 8+).
  (#197 by @cdosoftei and @SimonFrings)

• Feature: Support intersection types (PHP 8.1+).
  (#209 by @bzikarsky)

• Feature: Support DNF types (PHP 8.2+).
  (#236 by @nhedger)

• Feature: Port all memory improvements from 2.x to 3.x.
  (#150 by @clue and @WyriHaximus)

• Fix: Fix checking whether cancellable promise is an object and avoid possible warning.
  (#161 by @smscr)

• Improve performance by prefixing all global functions calls with \ to skip the look up and resolve process and go straight to the global function.
  (#134 by @WyriHaximus)

• Improve test suite, update PHPUnit and PHP versions and add .gitattributes to exclude dev files from exports.
  (#107 by @carusogabriel, #148 and #234 by @WyriHaximus, #153 by @reedy, #162, #230 and #240 by @clue, #173, #177, #185 and #199 by @SimonFrings, #193 by @woodongwong and #210 by @bzikarsky)

The following changes were originally planned for this release but later reverted
and are not part of the final release:

• Add iterative callback queue handler to avoid recursion (later removed to improve Fiber support).
  (#28, #82 and #86 by @jsor, #158 by @WyriHaximus and #229 and #238 by @clue)

• Trigger an E_USER_ERROR instead of throwing an exception from done() (later removed entire done() method to globally report unhandled rejections).
  (#97 by @jsor and #224 and #248 by @clue)

• Add type declarations for some() (later removed entire some() function).
  (#172 by @WyriHaximus and #219 by @clue)

A major new feature release, see release announcement.

• We'd like to emphasize that this component is production ready and battle-tested. We plan to support all long-term support (LTS) releases for at least 24 months, so you have a rock-solid foundation to build on top of.

• The v3 release will be the way forward for this package. However, we will still actively support v2 and v1 to provide a smooth upgrade path for those not yet on the latest versions.

This update involves some major new features and a minor BC break over the v2.0.0 release. We've tried hard to avoid BC breaks where possible and minimize impact otherwise. We expect that most consumers of this package will be affected by BC breaks, but updating should take no longer than a few minutes. See below for more details:

• BC break: PHP 8.1+ recommended, PHP 7.1+ required. (#138 and #149 by @WyriHaximus)

• Feature / BC break: The PromiseInterface now includes the functionality of the old ExtendedPromiseInterface and CancellablePromiseInterface. Each promise now always includes the then(), catch(), finally() and cancel() methods. The new catch() and finally() methods replace the deprecated otherwise() and always() methods which continue to exist for BC reasons. The old ExtendedPromiseInterface and CancellablePromiseInterface are no longer needed and have been removed as a consequence. (#75 by @jsor and #208 by @clue and @WyriHaximus)

  // old (multiple interfaces may or may not be implemented)
  assert($promise instanceof PromiseInterface);
  assert(method_exists($promise, 'then'));
  if ($promise instanceof ExtendedPromiseInterface) { assert(method_exists($promise, 'otherwise')); }
  if ($promise instanceof ExtendedPromiseInterface) { assert(method_exists($promise, 'always')); }
  if ($promise instanceof CancellablePromiseInterface) { assert(method_exists($promise, 'cancel')); }
  
  // new (single PromiseInterface with all methods)
  assert($promise instanceof PromiseInterface);
  assert(method_exists($promise, 'then'));
  assert(method_exists($promise, 'catch'));
  assert(method_exists($promise, 'finally'));
  assert(method_exists($promise, 'cancel'));
  

• Feature / BC break: Improve type safety of promises. Require mixed fulfillment value argument and Throwable (or Exception) as rejection reason. Add PHPStan template types to ensure strict types for resolve(T $value): PromiseInterface<T> and reject(Throwable $reason): PromiseInterface<never>. It is no longer possible to resolve a promise without a value (use null instead) or reject a promise without a reason (use Throwable instead). (#93, #141 and #142 by @jsor, #138, #149 and #247 by @WyriHaximus and #213 and #246 by @clue)

  // old (arguments used to be optional)
  $promise = resolve();
  $promise = reject();
  
  // new (already supported before)
  $promise = resolve(null);
  $promise = reject(new RuntimeException());
  

• Feature / BC break: Report all unhandled rejections by default and remove done() method. Add new set_rejection_handler() function to set the global rejection handler for unhandled promise rejections. (#248, #249 and #224 by @clue)

  // Unhandled promise rejection with RuntimeException: Unhandled in example.php:2
  reject(new RuntimeException('Unhandled'));
  

• BC break: Remove all deprecated APIs and reduce API surface. Remove some(), map(), reduce() functions, use any() and all() functions instead. Remove internal FulfilledPromise and RejectedPromise classes, use resolve() and reject() functions instead. Remove legacy promise progress API (deprecated third argument to then() method) and deprecated LazyPromise class. (#32 and #98 by @jsor and #164, #219 and #220 by @clue)

• BC break: Make all classes final to encourage composition over inheritance. (#80 by @jsor)

• Feature / BC break: Require array (or iterable) type for all() + race() + any() functions and bring in line with ES6 specification. These functions now require a single argument with a variable number of promises or values as input. (#225 by @clue and #35 by @jsor)

• Fix / BC break: Fix race() to return a forever pending promise when called with an empty array (or iterable) and bring in line with ES6 specification. (#83 by @jsor and #225 by @clue)

• Minor performance improvements by initializing Deferred in the constructor and avoiding call_user_func() calls. (#151 by @WyriHaximus and #171 by @Kubo2)

• Minor documentation improvements. (#110 by @seregazhuk, #132 by @CharlotteDunois, #145 by @danielecr, #178 by @WyriHaximus, #189 by @srdante, #212 by @clue, #214, #239 and #243 by @SimonFrings and #231 by @nhedger)

The following changes had to be ported to this release due to our branching strategy, but also appeared in the 2.x branch:

• Feature: Support union types and address deprecation of ReflectionType::getClass() (PHP 8+). (#197 by @cdosoftei and @SimonFrings)

• Feature: Support intersection types (PHP 8.1+). (#209 by @bzikarsky)

• Feature: Support DNS types (PHP 8.2+). (#236 by @nhedger)

• Feature: Port all memory improvements from 2.x to 3.x. (#150 by @clue and @WyriHaximus)

• Fix: Fix checking whether cancellable promise is an object and avoid possible warning. (#161 by @smscr)

• Improve performance by prefixing all global functions calls with \ to skip the look up and resolve process and go straight to the global function. (#134 by @WyriHaximus)

• Improve test suite, update PHPUnit and PHP versions and add .gitattributes to exclude dev files from exports. (#107 by @carusogabriel, #148 and #234 by @WyriHaximus, #153 by @reedy, #162, #230 and #240 by @clue, #173, #177, #185 and #199 by @SimonFrings, #193 by @woodongwong and #210 by @bzikarsky)

The following changes were originally planned for this release but later reverted and are not part of the final release:

• Add iterative callback queue handler to avoid recursion (later removed to improve Fiber support). (#28, #82 and #86 by @jsor, #158 by @WyriHaximus and #229 and #238 by @clue)

• Trigger an E_USER_ERROR instead of throwing an exception from done() (later removed entire done() method to globally report unhandled rejections). (#97 by @jsor and #224 and #248 by @clue)

• Add type declarations for some() (later removed entire some() function). (#172 by @WyriHaximus and #219 by @clue)

This is a compatibility release to ensure a smooth upgrade path for those not yet
on Promise v3. We encourage upgrading to the latest version when possible, as
Promise v3 will be the way forward for this project.

• Feature: Full PHP 8.3 compatibility.
  (#256 by @clue)

• Feature: Support Disjunctive Normal Form Types (DNF types) for PHP 8.2+.
  (#237 by @nhedger)

• Feature: Add full support for PHP 8.2.
  (#233 by @WyriHaximus and #241 by @clue)

• Improve examples in documentation.
  (#226 by @nhedger)

• Improve test suite and project setup and report failed assertions.
  (#215 and #217 by @SimonFrings and #241 by @clue)

• Feature: Support union types and address deprecation of ReflectionType::getClass() (PHP 8+).
  (#198 by @cdosoftei and @SimonFrings)

  $promise->otherwise(function (OverflowException|UnderflowException $e) {
      echo 'Error: ' . $e->getMessage() . PHP_EOL;
  });

• Feature: Support intersection types (PHP 8.1+).
  (#195 by @bzikarsky)

  $promise->otherwise(function (OverflowException&CacheException $e) {
      echo 'Error: ' . $e->getMessage() . PHP_EOL;
  });

• Improve test suite, use GitHub actions for continuous integration (CI),
  update to PHPUnit 9, and add full core team to the license.
  (#174, #183, #186, and #201 by @SimonFrings and #211 by @clue)

• Mark FulfilledPromise, RejectedPromise and LazyPromise as deprecated for Promise v2 (and remove for Promise v3).
  (#143 and #165 by @clue)

  // deprecated
  $fulfilled = new React\Promise\FulfilledPromise($value);
  $rejected = new React\Promise\RejectedPromise($reason);
  
  // recommended alternatives
  $fulfilled = React\Promise\resolve($value);
  $rejected = React\Promise\reject($reason);

• Fix: Fix checking whether cancellable promise is an object and avoid possible warning.
  (#168 by @smscr and @jsor)

• Improve documentation and add docblocks to functions and interfaces.
  (#135 by @CharlotteDunois)

• Add .gitattributes to exclude dev files from exports.
  (#154 by @reedy)

• Improve test suite, run tests on PHP 7.4 and update PHPUnit test setup.
  (#163 by @clue)

• Fix: file_exists warning when resolving with long strings. (#130 by @sbesselsen)
• Improve performance by prefixing all global functions calls with \ to skip the look up and resolve process and go straight to the global function. (#133 by @WyriHaximus)

See 2.x CHANGELOG for more details.

This is a compatibility release to ensure a smooth upgrade path for those not
yet on Promise v3. We encourage upgrading to the latest version when possible,
as Promise v3 will be the way forward for this project.

• Feature: Full PHP 8.3 compatibility.
  (#257 by @clue)

• Improve test suite, use GitHub actions for continuous integration (CI) and
  report failed assertions.
  (#242 by @clue and #175, #184, #187, #216 and #218 by @SimonFrings)

See 1.x CHANGELOG for more details.