Implements a priority-based semaphore with group fairness, leases, and pause/resume capabilities. Used internally for queue job concurrency but could be extracted as a standalone concurrency primitive for any async system requiring prioritized access with fairness guarantees.

SSRF-safe HTTP client with URL validation, DNS resolution with caching and pinning to prevent rebinding attacks, proxy rotation per request, and redirect handling. Demonstrates security-conscious networking that can be reused in any application needing to fetch external URLs safely.

Provides an AsyncSemaphore class and a limitConcurrency utility for bounding parallel async operations. Self-contained and testable, it can be reused directly in any TypeScript project needing concurrency control.

A generic batching queue that groups document add/delete operations into configurable batches with deduplication. Designed for Meilisearch indexing but the pattern is reusable for any bulk operation system requiring debounced batch processing.

Parses a search query language supporting tags, URLs, date ranges, type filters, and boolean operators using typescript-parsec. Returns an AST that can be translated to any query backend. Reusable in any application needing a custom search query parser.