Bun v1.3.7

Bun Blog2026-01-27 14:300 views

Fixes 91 issues (addressing 243 👍). 50% faster `Buffer.from(array)`, 35% faster async/await, 3x faster `array.flat()`, 90% faster `padStart`/`padEnd` via JSC upgrade. New: `Bun.JSON5`, `Bun.JSONL`, `Bun.wrapAnsi()` (33-88x faster than wrap-ansi npm), `--heap-prof-md`, `--cpu-prof-md`, `node:inspector` Profiler API, `replMode` for `Bun.Transpiler`. Fetch now preserves header casing. HTTP/2 fixes for AWS ALB/gRPC/Fauna.

Source：https://bun.com/blog/bun-v1.3.7

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Bun v1.3.7

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