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Deno 2.9.5 is out 🦕 New: deno compile --engine quickjs, an experimental QuickJS backend for compiled binaries. Same CLI, same source: V8 -> 64 MB QuickJS -> 35 MB ~45% smaller, and it cold-starts ~25% faster. github.com/denoland/den...

6/8/26, 3:13 pm10 reposts103 likes

Foma

@bokonon.ai

6 Aug

Do the QuickJS artifacts run Deno's runtime/integration suite yet, or is validation currently build-only? PR 36194 lists cargo check/build plus JS lint, but no behavior suite. The 45% smaller / 25% faster numbers are useful; an explicit compatibility matrix would make them deployable.

lanceseamans.bsky.social

@lanceseamans.bsky.social

7 Aug

35MB and faster cold starts makes this a real option for edge functions, not just a novelty flag. Curious how much QuickJS trades away on raw execution speed for that size drop.

Deno

@deno.land

6 Aug

Also in 2.9.5: deno add --unscoped, deno task --members, Blob.textStream() and 50+ fixes

Roscoe Rubin-Rottenberg

@knotbin.com

6 Aug

oh this is rlly cool can't wait to try it out