Build and deploy Cloudflare Workers using Bun for development.

Generate optimized Docker images for Bun applications. Use when deploying to containers, minimizing image sizes, setting up CI/CD pipelines, or deploying to Kubernetes.

Set up high-performance development servers with Hot Module Replacement. Use when creating dev servers for web apps, setting up React Fast Refresh, or configuring API servers with live reload.

Use for Docker with Bun, Dockerfiles, oven/bun image, containerization, and deployments.

Use when integrating Drizzle ORM with Bun's SQLite driver for type-safe schema definitions and migrations.

bun-expert

Bun's FFI allows calling native C/C++ libraries from JavaScript.

Use for Bun file I/O: Bun.file, Bun.write, streams, directories, glob patterns, metadata.

Describes efficient usage of Bun and Bun APIs instead of Node.js (and its APIs)

Pure Bun-native filesystem utilities from @sidequest/core/fs. Use when you need command-injection-safe filesystem operations, prefer Bun over node:fs, or want token-efficient fs helpers. All functions use Bun.spawn, Bun.file(), or Bun.write() - no node:fs dependencies.

Use when building APIs with Hono framework on Bun, including routing, middleware, REST APIs, context handling, or web framework features.

Use when implementing hot reloading with Bun (--hot, --watch), HMR, or automatic code reloading during development. Covers watch mode, hot mode, and HTTP server reload.

Use when building HTTP servers with Bun.serve, handling requests/responses, implementing routing, creating REST APIs, or configuring fetch handlers.

Initialize a new Bun project with TypeScript and optimal configuration. Use when starting a new Bun project or converting a directory to a Bun project.

Use when migrating from Jest to Bun's test runner, import compatibility, mocks, and config.

Evaluate JavaScript at bundle time and inline results. Use when optimizing compile-time code generation, embedding files, inlining environment variables, or executing code during the bundling process.

Run Next.js applications with Bun for faster development and builds.

Use when running Nuxt 3 with Bun runtime, building Vue/Nuxt apps with Bun, or configuring Nuxt projects to use Bun for development and production.

Bun package manager commands (install, add, remove, update), workspaces, lockfiles, npm/yarn/pnpm migration. Use for dependency management with Bun.

Bun package manager and runtime best practices

Use when getting started with Bun, installing Bun, initializing projects, or configuring bunfig.toml. Invoke for Bun setup, installation issues, or project scaffolding questions.

Use when building server-rendered React with Bun, including streaming SSR, hydration, renderToString, or custom SSR without a framework.

Use when working with Redis in Bun (ioredis, Upstash), caching, pub/sub, session storage, or key-value operations.

Bun runtime patterns and best practices. Package management, bundling, testing, scripts. Use when working with Bun as the JavaScript runtime.

Writing shell commands for OpenCode custom commands using Bun Shell

Bun shell scripting with Bun.$, Bun.spawn, subprocess management. Use for shell commands, template literals, or command execution.

Use for bun:sqlite, SQLite operations, prepared statements, transactions, and queries.

Use when building or running SvelteKit apps on Bun, including SSR, adapters, and Bun-specific APIs

TanStack Start full-stack React framework with Bun runtime. Use for TanStack Router, server functions, vinxi, or encountering SSR, build, preset errors.

Use for bun:test syntax, assertions, describe/it, test.skip/only/each, and basic patterns.

Use for test coverage with Bun, --coverage flag, lcov reports, thresholds, and CI integration.

Use for test lifecycle hooks: beforeAll, afterAll, beforeEach, afterEach, fixtures, preload.

Use for mock functions in Bun tests, spyOn, mock.module, implementations, and test doubles.

Configure Bun's built-in test runner with Jest-compatible APIs. Use when setting up testing infrastructure, writing unit/integration/snapshot tests, migrating from Jest, or configuring test coverage. 3-10x faster than Jest.

Use when writing tests with Bun's built-in test runner. Covers test organization, assertions, mocking, and snapshot testing using Bun's fast test infrastructure.

Bun has built-in WebSocket support integrated with `Bun.serve()`.

Use for Web Workers in Bun, worker_threads, parallel processing, and background tasks.

Configures Bun as an all-in-one JavaScript runtime, bundler, package manager, and test runner with native TypeScript support. Use when building fast applications, bundling for production, or replacing Node.js tooling.

Analyze and optimize JavaScript bundle size, identify large dependencies, and improve load times. Use when bundles are large, investigating performance issues, or optimizing frontend assets.

Bundle size analysis and optimization for Webpack, Vite, and esbuild

Analyzes JavaScript bundle sizes, identifies optimization opportunities, and helps reduce bundle size for faster page loads.

Import directly from source files instead of barrel files. Apply when using libraries like lucide-react, @mui/material, or @radix-ui/react-* to reduce bundle size and improve dev boot time.

Bundle size reduction strategies, icon optimization, tree-shaking, and performance analysis. Use when reducing bundle size or optimizing imports.

You are an expert in optimizing JavaScript bundle sizes and build performance

Monitor JavaScript bundle size and execution performance. Use when tracking bundle size, identifying large chunks, or optimizing load performance.

Reduce JavaScript and CSS bundle sizes through code splitting, tree shaking, and optimization techniques. Improve load times and overall application performance.

Reduce bundle size with splitting and compression.

Bundle and share code as gists or markdown. Use to create shareable code bundles, extract imports, and create GitHub gists.

How to write idiomatic assertions with the Bupkis assertion library for TypeScript and JavaScript

How to create & maintain TypeDoc site documentation and the README for Bupkis