Bun Is a Toolkit, Not Just a Runtime
Bun packs a runtime, package manager, bundler, and test runner into one binary. Here is how those four parts fit together and where the seams still show.
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Bun
3 posts about Bun. Every summary links to the original.
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- 2 companies
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Anthropic acquires Bun as Claude Code hits $1B
Anthropic announced the acquisition of Bun, a JavaScript runtime, as Claude Code reached $1 billion in run-rate revenue six months after becoming publicly available. Bun is an all-in-one toolkit that combines a runtime, package manager, bundler, and test runner, and the post says its focus on speed, reliability, and developer experience has made it important to Claude Code’s infrastructure. The companies had collaborated for months, with Bun helping scale Claude Code and contributing to its native installer; Anthropic says the acquisition will bring faster performance, improved stability, and new capabilities. Bun will remain open source and MIT-licensed, while Anthropic continues investing in its JavaScript and TypeScript tooling, which has more than 7 million monthly downloads and over 82,000 GitHub stars.
Print on Demand
Print on Demand presents a resource-conscious alternative to scaling an application by separating PDF generation from the main server. The post explains how a Fly.io PDF appliance uses Fly-Replay to route a PDF request to a machine running headless Chrome, which requests the original page without its “.pdf” extension and converts the returned HTML into a PDF. Each machine reuses one Chrome instance across requests, while auto_stop_machines allows idle machines to stop and restart on demand. Integration requires cloning the GitHub repository, creating and configuring an app, deploying it, and returning a fly-replay response header for PDF-directed requests. The extracted production code is packaged for deployment with existing applications, supports session, cookies, and basic authentication through passed-back HTTP headers, and can serve applications using different languages and frameworks.
Fly.io ❤️ Bun
Fly.io is preparing support for Bun as Bun 1.0 approaches, expanding beyond its ongoing Node.js work because Bun aims for complete Node.js API compatibility. With flyctl 0.1.54 and @flydotio/dockerfile 0.3.3, users can launch and deploy Bun applications through fly launch and fly deploy if Bun 0.5.3 or later is installed and package.json includes an eligible start, module/type, or main configuration. The post says applications following Bun’s Quickstart and Fly’s hands-on walkthrough can be deployed, and provides a sample. Support is beta, with noted compatibility issues including bun install lacking --prune, unsupported throwIfNoEntry in fs.statSync, and readline-based programs failing to exit; shared Dockerfile generation means fixes for either runtime generally benefit both.
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