2.0.0 - released 2020-10-24

View the release on GitHub

Changelog

Read the Composer 2.0 announcement first for the highlights!

Complete 2.0 Changelog

  • Breaking: This is a major release and while we tried to keep things compatible for most users, you might want to have a look at the UPGRADE guides
  • Many CPU and memory performance improvements
  • The update command is now much more deterministic as it does not take the already installed packages into account
  • Package installation now performs all network operations first before doing any changes on disk, to reduce the chances of ending up with a partially updated vendor dir
  • Partial updates and require/remove are now much faster as they only load the metadata required for the updated packages
  • Added a platform-check step when vendor/autoload.php gets initialized which checks the current PHP version/extensions match what is expected and fails hard otherwise. Can be disabled with the platform-check config option
  • Added a Composer\InstalledVersions class which is autoloaded in every project and lets you check which packages/versions are present at runtime
  • Added a composer-runtime-api virtual package which you can require (as e.g. ^2.0) to ensure things like the InstalledVersions class above are present. It will effectively force people to use Composer 2.x to install your project
  • Added support for parallel downloads of package metadata and zip files, this requires that the curl extension is present and we thus strongly recommend enabling curl
  • Added parallel installation of packages (requires OSX/Linux/WSL, and that unzip is present in PATH)
  • Added much clearer dependency resolution error reporting for common error cases
  • Added support for updating to a specific version with partial updates, as well as a --with flag to pass in temporary constraint overrides
  • Added automatic removal of packages which are not required anymore whenever an update is done, this will purge packages previously left over by partial updates and require/remove
  • Added support for TTY mode on Linux/OSX/WSL so that script handlers now run in interactive mode
  • Added only, exclude and canonical options to all repositories, see repository priorities for details
  • Added support for many new lib- packages in the platform repository and improved version detection for some ext- and lib-* packages
  • Added pre-operations-exec event to be fired before the packages get installed/upgraded/removed
  • Added pre-pool-create event to be fired before the package pool for the dependency solver is created, which lets you modify the list of packages going in
  • Added post-file-download event to be fired after package dist files are downloaded, which lets you do additional checks on the files
  • Added --locked flag to show command to see the packages from the composer.lock file
  • Added --unused flag to remove command to make sure any packages which are not needed anymore get removed
  • Added --dry-run flag to require and remove commands
  • Added --no-install flag to update, require and remove commands to disable the install step and only do the update step (composer.lock file update)
  • Added an --ask flag to create-project command to make Composer prompt for the install dir name, useful for project install instructions
  • Added support for multiple --repository flags being passed into the create-project command, only useful in combination with --add-repository to persist them to composer.json
  • Added --with-dependencies and --with-all-dependencies flag aliases to require and remove commands for consistency with update
  • Added shorthand aliases -w for --with-dependencies and -W for --with-all-dependencies on update/require/remove commands
  • Added more info to vendor/composer/installed.json, a dev key stores whether dev requirements were installed, and every package now has an install-path key with its install location
  • Added COMPOSER_DISABLE_NETWORK which if set makes Composer do its best to run offline. This can be useful when you have poor connectivity or to do benchmarking without network jitter
  • Added COMPOSER_DEBUG_EVENTS=1 env var support for plugin authors to figure out which events are triggered when
  • Added setCustomCacheKey to PreFileDownloadEvent and fixed a cache bug for integrations changing the processed url of package archives
  • Added Composer\Util\SyncHelper for plugin authors to deal with async Promises more easily
  • Added $composer->getLoop()->getHttpDownloader() to get access to the main HttpDownloader instance in plugins
  • Added --json and --merge flags to config command to allow editing complex extra.* values by using json as input
  • Added confirmation prompt when running Composer as superuser in interactive mode
  • Added --no-check-version to validate command to remove the warning in case the version is defined
  • Added --ignore-platform-req (without s) to all commands supporting --ignore-platform-reqs, which accepts a package name so you can ignore only specific platform requirements
  • Added --no-dev support to show and outdated commands to skip dev requirements
  • Added --format=summary flag to license command
  • Added a cache-read-only config option to make the cache usable in read only mode for containers and such
  • Added support for wildcards (*) in classmap autoloader paths
  • Added support for configuring GitLab deploy tokens in addition to private tokens, see gitlab-token
  • Added support for package version guessing for require and init command to take all platform packages into account, not just php version
  • Added support for tar in artifact repositories
  • Added a non-zero exit code (2) and warning to remove command when a package to be removed could not be removed
  • Added --apcu-autoloader-prefix (or --apcu-prefix for dump-autoload command) flag to let people use apcu autoloading in a deterministic output way if that is needed
  • Fixed package ordering when autoloading and especially when loading plugins, to make sure dependencies are loaded before their dependents
  • Fixed suggest output being very spammy, it now is only one line long and shows more rarely
  • Fixed conflict rules like e.g. >=5 from matching dev-master, as it is not normalized to 9999999-dev internally anymore
  • Fixed solver bug resulting in endless loops in some cases
  • Lots of minor bug fixes and improvements