Bun vs Lerna

Bun combines a JavaScript runtime, package manager, test runner, and bundler in one binary. It runs JavaScript and TypeScript on JavaScriptCore, with support for Node.js APIs and node_modules. Its npm-compatible package manager supports workspaces, catalogs, overrides, patches, readable lockfiles, private registry authentication, dependency resolution, and offline installation. The test runner includes Jest-compatible expectations, mocks, snapshots, DOM testing, and coverage. For builds, Bun handles TypeScript, JSX, CSS, and HTML for browsers and servers, and includes a development server with hot module reloading and single-file executables. Built-in APIs cover PostgreSQL, MySQL, SQLite, Redis, S3-compatible storage, HTTP, and WebSockets. The project names Next.js, Remix, Nuxt, Astro, SvelteKit, Hono, and Elysia among frameworks that run on Bun. It is MIT-licensed and developed publicly on GitHub. Bun runs on Linux, macOS, and Windows, subject to minimum OS versions and x64 processors with SSE4.2. Install options include an official script, npm, Homebrew, Windows package managers, and Docker. Support and discussion are available through Discord.

Lerna is a free, open-source build system for managing and publishing JavaScript and TypeScript packages from one repository. It runs commands across projects in an efficient order and can parallelize tasks, cache results, and distribute work across machines. When task files and terminal output are already in its computation cache, Lerna can restore them instead of rerunning the task. It manages package versioning and npm publishing, with fixed or independent versioning workflows, and includes an interactive graph for viewing workspace structure and dependencies. Lerna uses Nx to identify workspace packages and dependencies and to run scripts with parallelism, caching, and distribution. It supports npm, yarn, pnpm, and bun; dependency installation and linking should be handled through those package managers’ workspace features. Nx Cloud has a free Hobby plan, a Team plan at $29 a month, and Enterprise with custom pricing. For closed-source projects, Nx Cloud provides the first 500 computation hours per month free, then charges $1 per computation hour. Its Hobby plan includes 50,000 credits monthly, five contributors, 10 concurrent CI connections, and community support.