A package uses Ballerina library packages as dependencies. The sections below include information about working with library packages.
Create a library package
Execute the command below to create a new library package named
bal new --template lib hello
This creates the files below.
> cd hello > tree . . ├── Ballerina.toml ├── Module.md ├── Package.md ├── hello.bal ├── resources └── tests └── lib_test.bal 2 directories, 5 files
Ballerina.tomlfile identifies the directory as a Ballerina package. You can edit the
Ballerina.tomlfile to change the organization, name, and the version of the package.
Package.mdis required when you publish a package to a repository. You can edit the content to add a meaningful description about the package.
tests/directory, and the
Module.mdfile belong to the default module of the package.
For more information on these files, see Package layout.
To generate the Ballerina archive, execute the command below.
You view the output below.
Compiling source user/hello:0.1.0 Creating bala target/bala/user-hello-any-0.1.0.bala
Publish a library package to Ballerina Central
You can publish a Ballerina archive to the Ballerina Central. Before you publish, ensure the package works as intended because a publish is permanent. Once published to Ballerina Central, you cannot overwrite the version or remove the package. However, the number of package versions you can push to Ballerina Central is not restricted.
Tip: As a precaution, use the local repository first to test out the functionality of the library package before publishing it to Ballerina Central.
Prepare for publishing
Create an account on Ballerina Central. To register, visit the home page and log in via a Google or GitHub account.
Navigate to the Dashboard and acquire an access token.
Download and place the
Settings.tomlfile in your home repository (
<USER_HOME>/.ballerina/). If you already have a
Settings.tomlfile configured in your home repository, follow the other option and copy the access token into the
Settings.toml. If you are connected to the internet via an HTTP proxy, add the following section to
Settings.tomland change accordingly.
Define the organization
When you push a package to Ballerina Central, the organizations are validated against the value of the
org field defined in the Ballerina.toml file. Therefore, when you have more than one organization in Ballerina Central, pick the organization name that you intend to push the package into, set that as the
org in the
Ballerina.toml file inside the package directory, and rebuild the package. If you do not have any organizations created, you can visit the organizations page to create one.
Also, organization names starting with
ballerinai, etc.) are reserved for system use, and you cannot publish any packages starting with the
ballerina prefix to Ballerina Central. Therefore, if you have used a name pattern matching this, update the
Ballerina.toml and rebuild the package.
Publish the package
Now, that you are ready to publish, execute the command below to publish the package to Ballerina Central.
Use the packages in Ballerina Central
After publishing your first package, you can create a second package and use the already published package in it. Any package published in Ballerina Central is public and can be used in other packages. For more information, see Import a module.