A generic, typed event emitter that decouples components. Used across the plugin for task update notifications, settings changes, and view refresh. Self-contained, zero dependencies, and easily extractable for any TypeScript project needing a simple pub/sub pattern.

A lightweight DOM diffing and reconciliation utility that updates DOM elements incrementally without full re-renders. Preserves element state, supports optimistic updates, and handles insertion/removal/reordering efficiently. Ideal for any application with dynamic lists or cards that need smooth updates.

A virtual scroller implementation for rendering large lists of tasks with keyed item support. Handles insertion, removal, and reordering without full re-render. Includes scroll position preservation and null/undefined item handling. Reusable for any web app needing efficient rendering of thousands of items.

A request deduplication utility with a predictive prefetcher. Avoids redundant network or computation calls for the same key, and optionally prefetches likely next requests. Includes timeout and prioritization. Useful for any data-fetching layer to reduce load and latency.

A pure grouping service that organizes tasks into two-level hierarchies (primary group + subgroup) with customizable sorting. No coupling to Obsidian or plugin internals. Can be extracted and reused in any data processing pipeline requiring hierarchical grouping and sorting.

A collection of filter utilities for building, normalizing, and evaluating filter predicates against task data. Supports user-defined fields, date comparisons, multi-tag, and boolean operators. The FilterQueryPlanner sub-module provides index-based query optimization with caching. Reusable for any application needing flexible, configurable filtering.