Provides robust mouse/touch position calculation relative to DOM elements, handling complex contexts like iframes, scrolling, and touch events. Implements coordinate space transformation with proper error handling for edge cases. Demonstrates deep understanding of web APIs and coordinate systems through careful consideration of document containment, window properties, and element bounding calculations.

Implements essential vector operations (add, subtract, scale, normalize, dot product, etc.) as pure functions with TypeScript typing. Follows functional programming principles with no side effects, returning new vectors rather than mutating inputs. The clean, mathematical implementation is highly reusable in graphics, physics, or geometry-related contexts with zero external dependencies beyond basic utilities.

Contains a collection of generally useful utility functions including fastMap (optimized array mapping), clamp (value constraint), scalemap (range mapping), scaleToFill (aspect-ratio preserving scaling with bleed support), and DOM helpers. The scaleToFill function particularly demonstrates non-obvious skill in handling proper aspect ratio preservation with optional bleed for border hiding. These utilities are largely self-contained and extractable to other projects.

Encapsulates webcam access and rendering to a canvas with proper promise-based initialization, automatic resize handling, and resource cleanup. Manages the getUserMedia promise chain, video element lifecycle, and canvas synchronization. Includes frame rate detection and proper track stopping. Shows strong resource management practices essential for media handling in web applications.