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Publishing Packages with Dart

The Dart ecosystem is a collection of packages and libraries that you can import in your Dart-lang based projects. If you are creating a Flutter app, you will have a pubspec.yaml file with the dependencies needed to run it.

Publishing your own a package(s) is fairly simple. All packages are published to: pub.dev

Before Publishing

There are some constraints that need to be met before publishing a package in Dart:

Firstly, the project should have a README.md, a CHANGELOG.md and a pubspec.yaml file (which is used to fill out the details about the package - these can be found on the package's page, like in the picture below).

dart-multihash-package

The pubspec.yaml file for the dart_multihash package is:

name: dart_multihash
description: A dart-lang implementation of the Multihash protocol.
version: 0.0.1
homepage: https://github.com/dwyl/dart_multihash
repository: https://github.com/dwyl/dart_multihash
issue_tracker: https://github.com/dwyl/dart_multihash/issues

environment:
  sdk: '>=2.18.4 <3.0.0'

dependencies:
  buffer: ^1.1.1

dev_dependencies:
  lints: ^2.0.0
  crypto: ^3.0.2
  convert: ^3.1.1
  test: ^1.16.0
  collection: ^1.17.0

The name, description, version, homepage, repository, issue tracker, amongst other properties effect the sidebar of the official page of the package after publishing.

Verified Publishers

If you have wondered about, you might have noticed that lots of packages are published by ...well, publishers.

In the previous picture, regarding the dart_multihash package you might have noticed that there's a dwyl.com publisher associated.

There are a few advantages to having a verified publisher. The users know the package domain is verified, know the organization behind it is trustworthy and can safely use the package. Plus, you get a sweet tick icon!

If you are a person or a group of people that is interested in publishing under a single name, publishing through a verified publisher is the way to go.

You will need your own domain and prove Google that you own it. That is the domain the publisher will be associated with.

For the steps to get this done, do visit https://dart.dev/tools/pub/publishing#create-verified-publisher

Publishing Your Package

So let's imagine you've completed your sweet Dart/Flutter package and you want to share it with the world!

There are some differences between Dart and Flutter packages, the main one being that the latter pertains to Flutter apps. Dart packages are more agnostic and not Flutter-specific.

If you were to use Visual Studio and View -> Command Palette and try to create a Flutter Package and a Dart Package, although the project structure is the same, there are two differences: pubspec.yaml doesn't load the Flutter SDK in the Dart's package and the analysis_options.yaml file imports different linting packages. That's it. 😄

Even if you are a publisher, currently, you can't directly publish your package to your verified publisher, you need to upload to your personal account and then transfer it to the chosen verified publisher.

In your project root, go to your terminal and type the following.

 dart pub publish --dry-run

This command will make sure the package follows the pubspec format and package layout conventions. If your package yields warnings, don't worry! Just follow the suggestions (it's usually just linting or renaming files or specifying dependencies) and you should be good to go!

Once there are no issues and you feel you are ready to publish, just run the following command!

 dart pub publish --dry-run

You should be prompted with the following output.

Publishing is forever; packages cannot be unpublished.
Policy details are available at https://pub.dev/policy

Do you want to publish dart_multihash 0.0.1 to https://pub.dartlang.org (y/N)?

Press y. You should now see the following.

Pub needs your authorization to upload packages on your behalf.
In a web browser, go to https://accounts.google.com/o/oauth2/auth?axxxx
Then click "Allow access".

Waiting for your authorization...

Your link will be custom. If you visit it in your browser, it will ask you to sign-in with your Google account.

sign-in

After signing-in, you should be good to go! You have now your own profile in https://pub.dev/!

If you authorize it, your terminal should display the following.

Waiting for your authorization...
Authorization received, processing...

Successfully authorized.
Uploading... (2.2s)

This means your package has been published! :tada: Congrats!

Transferring to a Verified Publisher

If you are part of an organization/verified publisher, you can transfer your uploaded package to it. To do so, simply head to the package page inside https://pub.dev/. You will see something similar to this.

image

Inside the Admin tab, you can change ownership. Simply select the publisher you want and click on Transfer to Publisher. You have to be part of the organization/publisher to be able to transfer ownership.

And it's as simple as that! 😊