Bun seems to be focusing on startup speed, which makes it a good choice for edge use cases, said Andrew Cornwall, senior analyst at Forrester Research. But that means it is competing with WebAssembly runtimes that can start even faster, he said.
However, Bun is already showing interesting enough performance to make developers consider it as an alternative to runtimes such as Node.js and Deno, said Holger Mueller, vice president and analyst at Constellation Research.
But while Zig can compile to Windows and Arm, it is a less-well-known language, which limits Bun's potential developer pool, Cornwall said.
Andrew CornwallSenior analyst, Forrester Research
Bun may have adoptability issues
While Deno and Node.js can run on multiple platforms, Bun is tied to high-performance Unix variants -- macOS (x86 and Arm), Linux or Microsoft Windows Subsystem for Linux (WSL), which limits its use, Cornwall said. Windows developers will have to use WSL -- which is primarily aimed at Linux developers operating in a Windows environment and comes with limitations such as only being available for Windows 10.
Despite these drawbacks, Bun is worth watching -- especially if it picks up sponsorship from a major edge provider who wants to replace V8 for short-running tasks, Cornwall said.
"It's not likely that Bun will cause a large-scale flight from Node.js just yet, but it might find a place in the toolbox," Cornwall said.
Developers can install Bun by running an install script to download Bun from GitHub.