Bun Runtime

• Entity ID: ent-20260410-09219e072af3
• Type: concept
• Scope: shared
• Status: active

Description

Claude Code runs on Bun (not Node.js). Key implications: native JSX/TSX support without transpilation, bun:bundle feature flags for dead-code elimination, ES modules with .js extensions (Bun convention). Heavy modules are lazy-loaded via dynamic import() (OpenTelemetry ~400KB, gRPC ~700KB).

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