Using the question below I've installed extensions hosted on private and public repositories using composer, but I need to create my custom extension now.
How to install an extension on a private Github using Composer?
What are the requirements to prepare my extensions on Github to be installed using the composer?
Key points:
Minimum required elements:
Declare component dependencies in composer.json.
Register the component using registration.php.
Component-specific XML definition files:
Distribute your component:
Package your component in .zip format.
Use our validation tool to check your package before you distribute it.
If you upload the component to Magento Marketplace, it should be less than 30MB in size.
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