The type of change, which is applied by the commit, the emoji is the first part of the commit message.
🛠 - A change to do with configuration files or nonspecific code changes
⚠ - A change, which is unfinished or breaks the codebase (usually only pushed to the "dev" branch)
⬆ - Upgrading / updating an existing dependency
🌸 - A change concerning aesthetics (e.g changing the projects name, changing icons etc.)
✨ - A small change improving developer experience or user experience
🧪 - The creation or modification of tests
✒ - Renaming a file is (one of) the only change(s) in this commit
➕ - Adding a new feature or dependency
🎉 - Something to celebrate (e.g. A new release of the project, the first x of the project etc.)
Custom emojis can be used for libraries, whose icon closely resembles an emoji (e.g. 🪐 for the popular Apollo GraphQL server library).
Write your commit message in the imperative: "Fix bug" and not "Fixed bug" or "Fixes bug." This convention matches up with commit messages generated by commands like git merge and git revert.