A formal state machine for date picker interactions, with guards, actions, and transition maps. It is self-contained within the `@carbon/utilities` package and can be reused in any framework to drive date selection logic, demonstrating advanced state management and deterministic behavior.

A pure function that generates a calendar grid (weeks, days) from a given month and year, with configurable first-day-of-week. It is side-effect-free, well-typed, and can be extracted to any JavaScript project needing calendar rendering logic.

The core metadata pipeline for processing SVG icon assets into structured data with extensions for categories, deprecations, module names, and output optimization. This module encapsulates a reusable pattern for ingesting raw SVG files and generating framework-specific icon components, and could be adapted for other icon systems.

A programmatic SCSS code generator that builds SCSS source code from an AST-like structure. It provides a clean abstraction for generating maintainable SCSS output, with support for mixins, variables, and nesting. This utility is self-contained and could be reused in any project needing to generate SCSS programmatically.

A Lit mixin that automatically manages event listeners on the host element during `connectedCallback`/`disconnectedCallback`. It reduces boilerplate and ensures proper cleanup. This pattern is framework-agnostic for Lit and can be extracted into any Lit project for declarative event binding.

A React hook that implements the controlled/uncontrolled component pattern, allowing a component to be used with or without an external state. It is a well-crafted utility with proper TypeScript generics, avoiding common pitfalls like stale closures. This pattern is reusable across any React library.