OtherARTICLEThe Pulse: What can we learn from Bun’s rapid Rust rewrite with AI?
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The Pulse is a series covering events, insights, and trends within Big Tech and startups. Notice an interesting event or trend? Hit reply and share it with me. Today, we cover: Bun’s Rust rewrite with Fable: what can we learn? To a sceptic, spending $165K to migrate Bun from Zig to Rust sounds very expensive. But to a realist, shortening a 1-2 year migration down to 11 days opens amazing new opportunities for devs. However, a thoroughly-tested project is required to pull it off. Anthropic&
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Most AI-coding takes stay theoretical; this one crunches the actual numbers on a real migration — $165K and 11 days to move Bun from Zig to Rust, versus the 1-2 years it would've taken by hand. The kicker is the precondition: it only works because the project was thoroughly tested. Read it if you're weighing a large-scale AI-assisted rewrite and want a realistic sense of the cost, speed, and test-coverage bar you'll need to clear first.
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