CLI and SDK for AI image generation (simpill): Gemini, OpenAI, xAI. Core, ai-image-gen CLI, optional web app.

Root package for simpill-utils: all utils are installed from npm (@simpill/<name>.utils). Run 'npm install' at repo root. Use 'npm run use:local' to point at local utils/ for development.

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

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

Retry failed promises with timeout, delay, and backoff; limit concurrency with Semaphore (Node and Edge).

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

Engine-agnostic AI image generation SDK: Gemini, OpenAI, xAI adapters, Zod schemas, prompt registry, and guard

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

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

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

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

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

Test patterns, faker wrapper, enricher, and test-runner helpers (Node and Edge).

Hash, randomBytes, and timing-safe compare for Node.js.

Reconnecting WebSocket client with optional heartbeat (Node and Edge).

Single integration surface for correlation middleware, request context, and logger (Node).

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

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

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

Circuit breaker, rate limiter, bulkhead, and jittered backoff for fault-tolerant APIs (Node and Edge).