A promise-based mutex that prevents concurrent execution of critical sections identified by a string key. Supports timeouts and queuing. Pure utility with no internal dependencies, directly reusable in any JavaScript project needing simple mutual exclusion.

A lightweight class for handling pointer events (mouse, touch) with support for drag/swipe detection, speed calculation, and event lifecycle callbacks (onDown, onMove, onUp). No external dependencies beyond basic DOM. Usable in any web project requiring gesture recognition.

Implements marquee selection (click-and-drag to select multiple items) and keyboard multi-select (Shift/Ctrl+click) for a grid or list of items. Uses a lightweight DOM query wrapper but could be adapted to any UI project needing multi-select interactions.

A storage driver providing atomic JSON file writes (via the 'atomically' library) and optional encryption using Electron's safeStorage. Offers a consistent get/set/delete interface with throttled writes and cross-window synchronization. The pattern of configurable driver backing with fallback logic is reusable for apps needing persistent state.

A versioned data migration system that runs a sequence of pure transformation functions in order, each keyed by a version number. Supports adding new migrations without modifying existing ones. The pattern of versioning stored data and applying incremental transformations is highly reusable for any application with evolving local data schemas.