The launch of Bun 1.4 stands out for its core innovation: harnessing AI to rewrite a substantial portion of its foundational code, transitioning from the Zig language to Rust. Remarkably, the primary project was accomplished in a mere 11 days, with subsequent ongoing debugging carried out by an Agent before its formal release. This development has captured the industry's spotlight, prompting InfluxDB founder Paul Dix to comment that conventional software development practices are slowly but surely becoming outdated. At present, a number of developers have transitioned to guiding Agents through crafted prompts and framework construction. Bun's code rewrite serves as a testament to the effectiveness of this novel working method. Nonetheless, Dix also emphasized that human-authored code won't vanish overnight; in the future, code might evolve into an intermediate output produced by machines, and the most sought-after programmers will be those adept at steering AI operations.