Bun's Roadmap

[Jarred-Sumner]

Bun's Roadmap

The Bun team updates this issue to share our current roadmap, priorities, and goals. You can see our current update below, and previous updates at the bottom.

Spring 2025

Node.js compatibility

For every change we make to Bun, we run the Node.js test suite to ensure that Bun is compatible with Node.js. We also started a bounty program within our team, to accelerate our progress.

Our goal is to be 90% compatible with Node.js. We'll be providing updates as our progress nears completion.

Features

While we continue to work on Node.js compatibility and bug fixes, we’re also going to be working on new features in upcoming releases of Bun, including:

• #18812 Redis client
• #19699 MySQL support with Bun.sql
• #19701 SQLite support with Bun.sql (in addition to the existing bun:sqlite API)
• #4824 Test runner support in VSCode
• #7589 Running scripts with filters, and in parallel, using bun run
• #947 REPL support (replacement for existing, 3rd-party package: bun repl)
• Improve usage of bun install at work, including:
  • #7157 Support migration from pnpm-lock.yaml to bun.lock
  • #4844 Support catalogs
  • #6608 Support nested resolutions and overrides
  • Fix issues with workspaces, private registries, and corporate proxies

Reliability

We're also hard at work improving Bun's reliability, for example, reducing crashes and memory leaks. We've been working on a few projects to help with this.

• #19057 Address sanitizer (aka. ASAN)

  We now run address sanitizer in our CI, to detect bugs like heap buffer overflows

• v1.2.2 10-30% less memory usage when idle

  We made changes to how Bun schedules garbage collection, so that it syncs with JavaScriptCore. This improves memory usage when Bun is idle.

• Distribute a debug/assertion build of Bun

  Sometimes it's difficult to reproduce crashes without having access to your source code. We will soon distribute a special, optional build of Bun that includes more assertions and debug logs, so that it's easier for you to provide us with reproductions of issues.

Hiring

Bun’s team is growing!

• 3 years ago, it was just Jarred.
• 2 years ago, we raised a Seed round and grew to a team of 4.
• Today, we're 14 people

We’re also announcing new job openings at our San Francisco office, including:

• Head of Propaganda (aka. Developer Advocate) for $120k-$180k + Equity
• Engineering Manager for $180k-$240k + Equity
• Senior Systems Engineer(s) for $160k-$220k + Equity

If you’re excited about working at Bun, you can apply at bun.sh/careers.

Something new

Stay tuned.

Previous updates

Winter 2024

bun install

• Implement a text-based lockfile format #11863 (will unblock add support for bun dependabot/dependabot-core#6528)
• Support nested "resolutions" / "overrides" #6608
• Fixes for frequently-reported issues for things like private git URLs and some edgecases with hoisting
• bun update --interactive (Interactive update packages command. #4895)
• CA support for SSL connection to NPM registries #271
• Support an "engines" field in package.json #5846
• Update bun init to add "engines": { "bun": ... by default. If bun present then ignore node shebangs by default (#9346)
• bun why (like yarn why) #692

Runtime

Node.js compatibility

• Implement node:http2 server to unblock grpc2
• Implement more of V8 C++ APIs to unblock canvas, node-pty
• Rewrite node:http (Rewrite node:http to not use Request & Response #14384)
• Add much more comprehensive test coverage for napi
• Get at least 75% of Node's test suite running on every commit (as of last update: 37% currently). This number will go up in future
• Investigate removing our undici override
• Rewrite node:crypto #13681
• Add CompressionStream #1723

Reliability

• tracking: JSValue safety in our Zig and JS bindings #15141

Bake (Bundler)

The goal for Bake is to make Bun the most productive tool for building static & full-stack JavaScript and TypeScript applications, leveraging runtime, bundler, and transpiler integration to make things simpler.

High level:

• Make a fast HMR development full-stack server - bake dev server tracking issue #14324
• Production builds (bake production build tracking issue #14763)
  • Static production builds
• Implement an integration with a popular framework (such as Next.js)
• Easy & powerful plugin API

bun test

• Reporter API or socket API

Organizational

• Hire a contractor to help us with CI
• Hire a technical writer to help with docs
• Hire an engineering-focused role for maintaining the TypeScript types & frontend for docs + help with integrations with third-party packages
• Hire more systems engineers

Fall 2024

bun install

Essentially, feature complete.

• bun outdated
• Implement bun pm pack #487
• bun publish
• Text-based lockfile format (which will help unblock add support for bun dependabot/dependabot-core#6528)
• bun update --interactive (Interactive update packages command. #4895)
• Fixes for frequently-reported issues for things like private git URLs and some edgecases with hoisting

Runtime

Node.js compatibility

• TextEncoderStream & TextDecoderStream
• V8 C++ API (in-progress)
• Implement node:cluster
• Implement node:http2 server to unblock grpc2
• Rewrite node:zlib to address performance issues in some common packages
• Rewrite node:crypto #13681
• Fix various bugs in node:http, avoid wrapping Bun.serve() and fetch() and use a more direct implementation
• Add much more comprehensive test coverage for napi
• Get at least 25% of Node's test suite running on every commit (as of last update: 15% currently). This number will go up in future quarters.

Reliability

• Delete almost all code that manually reads JSValue. Replace with an IDL bindings generator for JavaScriptCore objects/classes that supports C++ & Zig output, and importantly: function arguments, return values, and exceptions. It should make the lifetime of these values brainless for us to reason about.
• Address TLS-related issues that have cropped up
• Continue to allocate significant time to fixing bugs and improve test coverage as they crop up

Bundler

• Fix many common bugs people run into related to source maps or incorrect output
• A new, higher-level iteration of Bun's bundler designed for server-driven JavaScript bake dev server tracking issue #14324
• CSS parser and bundler MVP of CSS parser #14167

bun test

• Reporter API or socket API

Organizational

• Hire a contractor to help us with CI
• Hire a technical writer to help with docs
• Hire an engineering-focused role for maintaining the TypeScript types & frontend for docs + help with integrations with third-party packages
• Hire more systems engineers

[RnbWd]

this seems like a lot of work... wow

[space7panda]

Can't wait for full npm-like config support. We are using our own npm registry, and the current build time is 40-60 minutes. If it will be at least 10 minutes this will be a game-changer!

[officialrajdeepsingh]

I am waiting for the stable version of the bun. What change bun in the javascript world.

[tipiirai]

Also waiting for the stable version. So exciting! I bet it's going to take a lot of time though. The scope of this project is much larger than what Node attempts to solve.

[matepaiva]

can someone confirm that right now I can't use the package mysql2? It throws me an error because it depends on TLS package and on NET package, and I think they were not implemented yet in Bun, but I am not sure.

[Kapsonfire]

still missing websocket server support

[GCSBOSS]

Can a tinitiny docker image be placed somewhere in there? 👀