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Composer v2.0.0-alpha1 Release Notes

Release Date: 2020-06-03 // almost 4 years ago

  • 🚀 Try it out now and get ready for the upcoming stable release

    • 🚀 Use composer self-update --preview to try the latest alpha/prerelease version (2.x).
    • ⚡️ Use composer self-update --snapshot to try the latest dev build (2.x).
    • 🚀 Use composer self-update --stable to go back to stable releases (1.x for now).
    • 🚀 Use composer self-update --1 in CI/scripts if you want to pin Composer to 1.x until you are ready to migrate, this will ensure you stay on 1.x releases even once a 2.0 stable comes out.

    🔄 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 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 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 lib-zip platform package
    • ➕ 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 --with-dependencies and --with-all-dependencies flag aliases to require and remove commands for consistency with update
    • ➕ 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 --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 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
    • 🛠 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