How to migrate shopify theme app extension from cli 2.0 to cli 3.0?

Solution:

To classify a directory as an extension, given directory must include a config file with a .toml extension. Quote from documentation (https://shopify.dev/apps/tools/cli/migrate#theme-app-extensions):

If you're migrating a theme app extension, then do the following:

1. Create a shopify.theme.extension.toml in the extension’s directory.

   The TOML should contain the following information:

   name: The name of your app extension. name should match the EXTENSION_TITLE from your extension's .env file.

   type: Enter theme.

   shopify.theme.extension.toml :

   name = "My theme extension"
   type = "theme"
   Copy code

2. Optional: delete any remaining .env, extension.config.yml, and .shopify-cli.yml files.

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