Fly.io ❤️ Bun

Bun 1.0 comes out September 7th. Fly.io is making preparations. Previously, we stated that Fly.io ❤️ JS, and we understandably started with Node.js. While that work is ongoing, it makes sense to start expanding to other runtimes. Bun is the obvio

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Fly.io
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Sam Ruby
•2 min read•intermediate•
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Overview

The article discusses the integration of Bun, a JavaScript runtime aiming for complete Node.js API compatibility, with Fly.io, a platform for deploying applications. It outlines the prerequisites for deploying Bun applications and highlights some beta issues encountered during the integration process.

What You'll Learn

1

How to deploy Bun applications using Fly.io

2

Why Bun is a suitable choice for Node.js compatibility

3

When to use Fly.io for deploying applications

Prerequisites & Requirements

  • Bun version 0.5.3 or later
  • Understanding of package.json structure and Node.js API

Key Questions Answered

What versions of flyctl and @flydotio/dockerfile are required to deploy Bun applications?
To deploy Bun applications, you need flyctl version 0.1.54 and @flydotio/dockerfile version 0.3.3. These versions enable the use of commands like 'fly launch' and 'fly deploy' for launching and deploying applications on Fly.io.
What are the conditions for a package.json to be compatible with Bun on Fly.io?
A package.json must have a 'start' entry in the scripts section, a 'module' entry with 'module' as the type, or a 'main' entry. Meeting at least one of these conditions allows for successful deployment of Bun applications.
What issues were encountered during the integration of Bun with Fly.io?
Some issues include the lack of a '--prune' option in 'bun install', unsupported 'throwIfNoEntry' in 'fs.statSync', and problems with programs using 'readline' that do not exit. These issues highlight the beta nature of the integration.

Technologies & Tools

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Runtime
Bun
Aims for complete Node.js API compatibility for application deployment.
Platform
Fly.io
Used for deploying applications built with Bun.

Key Actionable Insights

1
Ensure you have the correct versions of flyctl and @flydotio/dockerfile installed before deploying your Bun application.
Using outdated versions can lead to compatibility issues and deployment failures, so always check for the latest updates.
2
Familiarize yourself with Bun's Quickstart guide to ensure your application meets the necessary requirements for deployment.
Understanding the prerequisites and setup process will streamline your deployment experience and help avoid common pitfalls.
3
Monitor the Fly.io community for discussions on Bun integration to stay updated on potential bugs and fixes.
Being proactive in community discussions can provide insights into common issues and best practices for deploying Bun applications.

Common Pitfalls

1
Not having the required version of Bun can lead to deployment failures.
Always ensure you are using Bun version 0.5.3 or later to avoid compatibility issues when deploying on Fly.io.
2
Overlooking the necessary entries in package.json can prevent successful deployment.
Make sure your package.json includes the required 'start', 'module', or 'main' entries to ensure compatibility with Bun.