SMRTR ProgrammingMar 31, 2026Hacker News

JSSE: A JavaScript Engine Built by an Agent

SMRTR summary

A developer used Claude Code in autonomous mode to build JSSE, the first JavaScript engine to pass 100% of test262 non-staging tests. Built entirely in Rust over six weeks with only 4 hours of human involvement, the agent wrote 170,000 lines of code while the developer never touched the codebase directly.

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