• Break: The following event classes are deprecated and you should update your script handlers to use the new ones in type hints:
  • Composer\Script\CommandEvent is deprecated, use Composer\Script\Event
  • Composer\Script\PackageEvent is deprecated, use Composer\Installer\PackageEvent
• Break: Output is now split between stdout and stderr. Any irrelevant output to each command is on stderr as per unix best practices.
• Added support for npm-style semver operators (^ and - ranges, (space) = AND,|| = OR)
• Added --prefer-lowest to update command to allow testing a package with the lowest declared dependencies
• Added support for parsing semver build metadata +anything at the end of versions
• Added --sort-packages option to require command for sorting dependencies
• Added --no-autoloader to install and update commands to skip autoload generation
• Added --list to run-script command to see available scripts
• Added --absolute to config command to get back absolute paths
• Added classmap-authoritative config option, if enabled only the classmap info will be used by the composer autoloader
• Added support for branch-alias on numeric branches
• Added support for the https_proxy/HTTPS_PROXY env vars used only for https URLs
• Added support for using real composer repos as local paths in create-project command
• Added --no-dev to licenses command
• Added support for PHP 7.0 nightly builds
• Fixed detection of stability when parsing multiple constraints
• Fixed installs from lock file containing updated composer.json requirement
• Fixed the autoloader suffix in vendor/autoload.php changing in every build
• Many minor fixes, documentation additions and UX improvements