- Publishing is forever
- Preparing to publish
- Publishing your package
- What files are published?
- Publishing prereleases
- Publishing previews
- Marking packages as discontinued
The pub package manager isn’t just for using other people’s packages.
It also allows you to share your packages with the world. If you have a useful
project and you want others to be able to use it, use the
dart pub publish
Publishing is forever
Keep in mind that publishing is forever. As soon as you publish your package, users can depend on it. Once they start doing that, removing the package would break theirs. To avoid that, the pub.dev policy disallows unpublishing packages except for very few cases.
You can always upload new versions of your package, but old ones will continue to be available for users that aren’t ready to upgrade yet.
For already published packages that are no longer relevant or being maintained, you can mark them as discontinued.
Preparing to publish
When publishing a package, it’s important to follow the pubspec format and package layout conventions. Some of these are required in order for others to be able to use your package. Others are suggestions to help make it easier for users to understand and work with your package. In both cases, pub tries to help you by pointing out what changes will help make your package play nicer with the Dart ecosystem. There are a few additional requirements for uploading a package:
You must include a
LICENSEfile. We recommend the BSD 3-clause license, which the Dart and Flutter teams typically use. However, you can use any license that’s appropriate for your package. You must also have the legal right to redistribute anything that you upload as part of your package.
Your package must be less than 100 MB large after gzip compression. If it’s too large, consider splitting it into multiple packages, or cutting down on the number of included resources or examples.
Your package should depend only on hosted dependencies (from the default pub package server) and SDK dependencies (
sdk: flutter). These restrictions ensure that dependencies of your packages cannot become unavailable in the future.
You must have a Google Account, which pub uses to manage package upload permissions. Your Google Account can be associated with a Gmail address or with any other email address.
Pub uses the contents of a few files to create a page for your
pub.dev/packages/<your_package>. Here are the files that
affect how your package’s page looks:
README.mdfile is the main content featured in your package’s page. The file’s contents are rendered as Markdown. For guidance on how to write a great README, see Writing package pages.
CHANGELOG.md: Your package’s
CHANGELOG.mdfile, if found, is also featured in a tab on your package’s page, so that developers can read it right from pub.dev. The file’s contents are rendered as Markdown.
The pubspec: Your package’s
pubspec.yamlfile is used to fill out details about your package on the right side of your package’s page, like its description, homepage, etc.
Advantages of using a verified publisher
You can publish packages using either a verified publisher (recommended) or an independent Google Account. Using a verified publisher has the following advantages:
- The consumers of your package know that the publisher domain has been verified.
- You can avoid having pub.dev display your personal email address. Instead, pub.dev displays the publisher domain and contact address.
- A verified publisher badge is displayed next to your package name on both search pages and individual package pages.
Creating a verified publisher
To create a verified publisher, follow these steps:
Go to pub.dev.
Log in to pub.dev using a Google Account.
In the user menu in the top-right corner, select Create Publisher.
Enter the domain name that you want to associate with your publisher (for example,
dart.dev), and click Create Publisher.
In the confirmation dialog, select OK.
If prompted, complete the verification flow, which opens the Google Search Console.
- When adding DNS records, it may take a few hours before the Search Console reflects the changes.
- When the verification flow is complete, return to step 4.
Publishing your package
dart pub publish command to publish your package for the first time,
or to update it to a new version.
Performing a dry run
To test how
dart pub publish will work, you can perform a dry run:
$ dart pub publish --dry-run
Pub makes sure that your package follows the
pubspec format and
package layout conventions,
and then uploads your package to pub.dev. Pub also shows you all of
the files it intends to publish. Here’s an example of publishing a package
Publishing transmogrify 1.0.0 .gitignore CHANGELOG.md README.md lib transmogrify.dart src transmogrifier.dart transmogrification.dart pubspec.yaml test transmogrify_test.dart Package has 0 warnings.
When you’re ready to publish your package, remove the
$ dart pub publish
After your package has been successfully uploaded to pub.dev, any pub user can
download it or depend on it in their projects. For example, if you just
published version 1.0.0 of your
transmogrify package, then another Dart
developer can add it as a dependency in their
dependencies: transmogrify: ^1.0.0
Transferring a package to a verified publisher
To transfer a package to a verified publisher, you must be an uploader for the package and an admin for the verified publisher.
Here’s how to transfer a package to a verified publisher:
- Log in to pub.dev with a Google Account that’s listed as an uploader of the package.
- Go to the package details page (for example,
- Select the Admin tab.
- Enter the name of the publisher, and click Transfer to Publisher.
What files are published?
All files in your package are included in the published package, with the following exceptions:
- Your package’s lockfile.
- If you aren’t using Git, all hidden files (that is,
files whose names begin with
- If you’re using Git, any files ignored by your
Be sure to delete any files you don’t want to include (or add them to
dart pub publish lists all files that it’s going to publish
before uploading your package,
so examine the list carefully before completing your upload.
Whoever publishes the first version of a package automatically becomes
the first and only person authorized to upload additional versions of that package.
To allow or disallow other people to upload versions,
dart pub uploader command
or transfer the package to a verified publisher.
If a package has a verified publisher, then the pub.dev page for that package displays the publisher domain. Otherwise, the page displays the email addresses of the authorized uploaders for the package.
As you work on a package, consider publishing it as a prerelease. Prereleases can be useful when any of the following are true:
- You’re actively developing the next major version of the package.
- You want beta testers for the next release candidate of the package.
- The package depends on an unstable version of the Dart or Flutter SDK.
As described in semantic versioning, to make a prerelease of a version
you append a suffix to the version. For example, to make a prerelease of
2.0.0 you might use the version
2.0.0-dev.1. Later, when you
2.0.0, it will take precedence over all
Because pub prefers stable releases when available, users of a prerelease package
might need to change their dependency constraints.
For example, if a user wants to test prereleases of version 2.1, then
^2.1.0 they might specify
When a prerelease is published to pub.dev,
the package page displays links to both the prerelease and the stable release.
The prerelease doesn’t affect the analysis score, show up in search results,
or replace the package
README.md and documentation.
Previews can be useful when all of the following are true:
The next stable version of the package is complete.
That package version depends on an API or feature in the Dart SDK that hasn’t yet been released in a stable version of the Dart SDK.
You know that the API or feature that the package depends on is API-stable and won’t change before it reaches the stable SDK.
As an example, consider a new version of
package:args that has
a finished version
2.0.0 but that
depends on a feature in Dart
where Dart SDK version
2.12.0 stable hasn’t been released yet.
The pubspec might look like this:
name: args version: 2.0.0 environment: sdk: '>=2.12.0-259.8.beta <3.0.0'
When this package is published to pub.dev,
it’s tagged as a preview version,
as illustrated by the following screenshot,
where the stable version is listed as
1.6.0 and the preview version is listed as
2.12.0 stable is released,
pub.dev updates the package listing to display
2.0.0 as the stable version of the package.
If all of the conditions at the beginning of this section are true,
then you can ignore the following warning from
dart pub publish:
“Packages with an SDK constraint on a pre-release of the Dart SDK should themselves be published as a pre-release version. If this package needs Dart version 2.12.0-0, consider publishing the package as a pre-release instead.”
Marking packages as discontinued
Although packages always remain published, it can be useful to signal to developers that a package is no longer being actively maintained. For this, you can mark a package as discontinued. A discontinued package remains published and viewable on pub.dev, but it has a clear DISCONTINUED badge and doesn’t appear in pub.dev search results.
To mark a package as discontinued, sign in to pub.dev using a Google Account that’s an uploader or verified publisher admin for the package. Then use the Admin tab of the individual package to mark the package as discontinued. If you change your mind, you can remove the discontinued mark at any time.
For more information, see the reference pages for the following