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Monday, February 2, 2026
Claude Code Internals
People are discussing the internal implementation details of Claude Code, specifically noting its use of the Bun runtime and its potential performance implications.
2 tweets•2 engagements
@eriklangilleErik Langille
Well Claude code uses bun so it would be safari devtools
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@ejae_devejae dev
it's the bun runtime doing its thing. claude code is bundled as a bun executable and the ink/react TUI re renders the full component tree on every tick. even when "idle" it's polling for events and redrawing the terminal UI. someone decompiled it recently and the react tree is
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