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Can Monodeploy be used without Yarn Berry?

No. Monodeploy uses Yarn Berry's public API to do most of the heavy lifting in reading and writing to your project.

Can I use monodeploy for non-JavaScript projects?

Yes. The only requirement is that you organize your project using Yarn Berry (i.e. Yarn v2+). You can create a minimal Yarn project by creating a root package.json and then one package.json per package/workspace. In this scenario, you likely want to use the "No Registry" mode.

Although designed for publishing to NPM, you can disable all npm interactions by passing in a --no-registry flag to the CLI or enabling noRegistry in your config file. Note that this is different than enabling dry-run, in that even reads from npm are disabled. If using "No Registry" mode, you should also enable --persistVersions (persistVersions) and commit the modified package.json files to your repository, otherwise there's no proper reference for the package versions.

How can I preview changes before publishing?

You can run:

yarn monodeploy --dry-run --changeset-filename=-

to implicitly disable logs and only output the changeset data. This is useful for previewing changes or determining which packages will be modified from a Pull Request.

Packages I haven't modified are being published with a patch version bump, what's going on?

In addition to the version strategies associated with packages explicitly modified via your commits, what we call the explicit version strategies, Monodeploy will also perform a patch version strategy bump to all dependent packages, what we call implicit version strategies. The idea behind this is that when you run tests and do development in your monorepo, you are always working with the latest packages. Therefore if Package-A depends on Package-B and Package-B has been modified, we also want to release a version of Package-A where Package-A's version range for Package-B has been increased. This Package-A that a downstream project consumes will then be guaranteed to be using the same version of Package-B that is used in the monorepo itself.

As an added benefit, downstream projects using systems like Renovate or Dependabot, will also receive updates for Package-A that will bring in the updated Package-B.

If there is a use case where you believe this behaviour is unwarranted, please open an issue and we'll be glad to discuss.

How does Monodeploy differ from:


Unlike Lerna, Monodeploy was designed with Yarn Berry support from the ground up and is optimized for Yarn monorepos. In terms of raw functionality, Monodeploy supports a workflow where versions are not committed back to the git repository. This is useful when it is not feasible to commit back to a repository in CI (for example when using a tool such as Jenkins with many concurrent developers working in a project).

Yarn's Version Plugin

At a high level, Monodeploy is meant for entirely automated workflows, whereas Yarn's version plugin takes a more hands on approach. Monodeploy started out as a Lerna replacement to solve some issues we were having internally with Lerna, and so Lerna's features were the ones we were striving to attain parity with. Read through the Yarn Version Plugin documentation and decide which workflow you prefer, there will be pros and cons to either.