Implements the core MBTI scoring algorithm: computes four dimension scores from 39 weighted answers, maps to archetypes, ranks characters by vector similarity with tie-breaking rules. Pure TypeScript with no framework dependencies, making it extractable for any quiz or recommendation system.

Provides color conversion (hex to RGB/HSL), relative luminance calculation, and readable text color selection based on background contrast. Self-contained and reusable for any web project needing dynamic color theming with accessibility guarantees.

Encapsulates localStorage operations with JSON serialization, error handling for quota exceeded or corrupted data, and a simple key-value API. Can be extracted as a lightweight persistence utility for any browser-based application.

A standalone Node.js script that validates the entire character dataset: checks image asset existence, question ID references, weight synchronization between engine and audit files, i18n completeness, and bidirectional consistency between source files and aggregated JSON. Demonstrates a robust validation pattern applicable to any data-heavy project.

Manages quiz state (current question, answers, progress persistence, result calculation) using Vue 3 composable pattern. Handles asynchronous data loading, localStorage recovery, and integration with the scoring engine. While Vue-specific, the state machine and persistence logic are reusable patterns for any quiz or survey application.