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Configuring Changesets

Changesets has a minimal amount of configuration options. Mostly these are for when you need to change the default workflows. These are stored in .changeset/config.json. Our default config is:

{
  "commit": false,
  "updateInternalDependencies": "patch",
  "linked": [],
  "access": "restricted",
  "baseBranch": "master",
  "ignore": [],
  "changelog": "@changesets/cli/changelog"
}

NOTE: the linked, fixed, updateInternalDependencies, bumpVersionsWithWorkspaceProtocolOnly, and ignore options are only for behaviour in monorepos.

commit (boolean, or module path as a string, or a tuple like [modulePath: string, options: any])

This option is for setting if the changeset add command and the changeset version commands will also add and commit the changed files using git, and how the commit messages should be generated for them.

By default, we do not commit the files, and leave it to the user to commit the files. If it is true, we use the default commit message generator (["@changesets/cli/commit", { "skipCI": "version" }]). Setting it to a string and options tuple specifies a path from where we will load the commit message generation functions. It expects to be a file that exports one or both of the following:

{
  getAddMessage,
  getVersionMessage
}

If one of the methods is not present then we will not commit the files changed for that command.

You would specify a custom commit message generator with:

{
  "commit": ["../scripts/commit.js", { "customOption": true }]
}

This is similar to how the changelog generator functions work.

access (restricted | public)

This sets how packages are published - if access: "restricted", packages will be published as private, requiring log in to an npm account with access to install. If access: "public", the packages will be made available on the public registry.

By default, npm publishes scoped npm packages as restricted - so to ensure you do not accidentally publish code publicly, we default to restricted. For most cases you will want to set this to public.

This can be overridden in specific packages by setting the access in a package's package.json.

If you want to prevent a package from being published to npm, set private: true in that package's package.json

baseBranch (git branch name)

The branch to which changesets will make comparisons. A number of internal changesets features use git to compare present changesets against another branch. This defaults what branch will be used for these comparisons. This should generally set to the major branch you merge changes into. Commands that use this information accept a --since option which can be used to override this.

To help make coding a more inclusive experience, we recommend changing the name of your master branch to main.

ignore (array of packages)

This option allows you to specify some packages that will not be published, even if they are referenced in changesets. Instead, those changesets will be skipped until they are removed from this array.

THIS FEATURE IS DESIGNED FOR TEMPORARY USE TO ALLOW CHANGES TO BE MERGED WITHOUT PUBLISHING THEM - If you want to stop a package from being published at all, set private: true in its package.json.

There are two caveats to this.

  1. If the package is mentioned in a changeset that also includes a package that is not ignored, publishing will fail.
  2. If the package requires one of its dependencies to be updated as part of a publish.

These restrictions exist to ensure your repository or published code do not end up in a broken state. For a more detailed intricacies of publishing, check out our guide on problems publishing in monorepos.

NOTE: you can also provide glob expressions to match the packages, according to the micromatch format.

fixed (array of arrays of package names)

This option can be used to declare that packages should be version-bumped and published together. As an example, if you have a @changesets/button component and a @changesets/theme component and you want to make sure that when one gets bumped to 1.1.0, the other is also bumped to 1.1.0 regardless if it has any change or not. To achieve this you would have the config:

{
  "fixed": [["@changesets/button", "@changesets/theme"]]
}

If you want to use this option, you should read the documentation on fixed packages to fully understand the implementation and implications.

linked (array of arrays of package names)

This option can be used to declare that packages should 'share' a version, instead of being versioned completely independently. As an example, if you have a @changesets/button component and a @changesets/theme component and you want to make sure that when one gets bumped to 2.0.0, the other is also bumped to 2.0.0. To achieve this you would have the config:

{
  "linked": [["@changesets/button", "@changesets/theme"]]
}

If you want to use this option, you should read the documentation on linked packages to fully understand the implementation and implications.

NOTE: This does not do what some other tools do, which is make sure when any package is published, all other packages are also published with the same version.

updateInternalDependencies

This option sets whether, when a package that is being dependend upon changes, whether you should update what version it depends on. To make this more understandable, here is an example:

Say we have two packages, one depending on the other:

pkg-a @ version 1.0.0
pkg-b @ version 1.0.0
  depends on pkg-a at range `^1.0.0

Say we are publishing a patch of both pkg-a and pkg-b - this flag is for determining whether we update how pkg-b depends on pkg-a.

If the option is set to patch, we will update the dependency so we will now have:

pkg-a @ version 1.0.1
pkg-b @ version 1.0.1
  depends on pkg-a at range `^1.0.1

If however the option is set to minor, what it depends on will only be updated when there is a minor change, so the state would be:

pkg-a @ version 1.0.1
pkg-b @ version 1.0.1
  depends on pkg-a at range `^1.0.0

Using minor allows consumers to more actively control their own deduplication of packages, and will allow them to install fewer versions if you have many interconnected packages. Using patch will mean consumers will more often be using more updated code, but may cause problems with deduplication.

Changesets will always update the dependency if it would leave the old semver range.

⚠ Note: this is only applied for packages which are already released in the current release. If A depends on B and we only release B then A won't be bumped.

changelog (false or a path)

This option is for setting how the changelog for packages should be generated. If it is false, no changelogs will be generated. Setting it to a string specifies a path from where we will load the changelog generation functions. It expects to be a file that exports the following:

{
  getReleaseLine,
  getDependencyReleaseLine
}

As well as the default one, you can use @changesets/changelog-git, which adds links to commits into changelogs, or @changesets/changelog-github, which requires github authentication, and includes a thankyou message to the person who added the changeset as well as a link to the relevant PR.

You would specify our github changelog generator with:

{
  "changelog": ["@changesets/changelog-github", { "repo": "<org>/<repo>" }]
}

For more details on these functions and information on how to write your own see changelog-functions

bumpVersionsWithWorkspaceProtocolOnly (boolean)

Determines whether Changesets should only bump dependency ranges that use workspace protocol of packages that are part of the workspace.

snapshot (object or undefined)

Default value: undefined

useCalculatedVersion (optional boolean)

Default value: false

When changesets version --snapshot is used, the default behavior is to use 0.0.0 as the base version for the snapshot release.

Setting useCalculatedVersion: true will change the default behavior and will use the calculated version, based on the changeset files.

prereleaseTemplate (optional string)

Default value: undefined (see note below)

Configures the suffix for the snapshot releases, using a template with placeholders.

Available placeholders:

You can use the following placeholders for customizing the snapshot release version:

  • {tag} - the name of the snapshot tag, as specified in --snapshot something
  • {commit} - the Git commit ID
  • {timestamp} - Unix timestamp of the time of the release
  • {datetime} - date and time of the release (14 characters, for example, 20211213000730)

Note: if you are using --snapshot with empty tag name, you cannot use {tag} as placeholder - this will result in error.

Default behavior

If you are not specifying prereleaseTemplate, the default behavior will fall back to using the following template: {tag}-{datetime}, and in cases where the tag is empty (--snapshot with no tag name), it will use {datetime} only.