String utilities: formatting, casing, trim, slugify (Node and Edge).

Composable design patterns: Result/Either, strategySelector, pipeAsync (Node and Edge).

Zustand store helpers: factory, persist, devtools, slices (Node and Edge).

Typed file I/O: readFileUtf8, readFileJson, writeFile, ensureDir for Node.js.

Backend misc: singleton, debounce, throttle, LRU, polling, intervals, enums, once, memoize (Node and Edge).

Typed factory builder, singleton factory, and error factory helpers (Node and Edge).

Typed metadata store and annotation helpers for symbols and keys (Node and Edge).

Type-safe LinkedList, Queue, Stack, LRU/TTL, MultiMap, BiMap—no full collections lib (Node and Edge).

Next.js App Router helpers: safe server actions, route handlers, request context, middleware.

Debounce, throttle, once, pipe, and compose with TypeScript inference (Node and Edge).

PubSub, observer, and typed event emitter (Node and Edge).

Lightweight, type-safe structured logging with correlation context for Node.js and Edge Runtime.

Typed API client with Zod validation, handler registry, and middleware (Node and Edge).

Typed error classes, error codes, and serializeError for logging and RPC (Node and Edge).

Array utilities: unique, chunk, compact, groupBy, sortBy, flattenOnce (Node and Edge).

AsyncLocalStorage request context (requestId, traceId) for Node.js logging and tracing.

Adapter helpers, logger and cache adapter interfaces (Node and Edge).

Lightweight, type-safe environment variable utilities for Node.js and Edge Runtime.

Shared protocol constants and types for HTTP, correlation, and env parsing (Node and Edge).

Token optimization utilities: cleaning, strategies, telemetry (Node and Edge).