canvasing/node_modules/firebase-tools/templates/extensions/javascript/WELCOME.md

This directory now contains the source files for a simple extension called greet-the-world. To try out this extension right away, install it in an existing Firebase project by running:

firebase ext:install . --project=<project-id>

If you want to jump into the code to customize your extension, then modify index.js and extension.yaml in your favorite editor. When you’re ready to try out your fancy new extension, run:

firebase ext:install . --project=<project-id>

As always, in the docs, you can find detailed instructions for creating and testing your extension (including using the emulator!).