v8x 149.4.0-rc.1

Engine agnostic JavaScript
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v8x makes rusty_v8 engine agnostic.

Docs: https://littledivy.github.io/v8x · Test dashboard: https://littledivy.github.io/v8x/status/

-v8 = "0.155.0"
+v8 = { package = "v8x", version = "0.155.0", features = ["jsc"] }

Supported engines:

  • V8 14.9.207.2-rusty
  • JavaScriptCore / WebKit 625.1+ and System-framework path uses the OS's JSC.
  • QuickJS-ng 0.15.1

Swap the engine under Deno without touching deno_core:

# deno's workspace Cargo.toml
v8 = { package = "v8x", version = "0.155.0", features = ["jsc"] }

- cargo build -p deno
+ cargo build -p deno --features hmr

v8x vendors the real v8 crate's Rust source and implements the v8__* C ABI on the chosen engine, so the swap is a drop-in — deno_core compiles unchanged.

engine deno size engine size
Deno V8 14.9 78.7 MB ~40 MB static
Deno JSC 80.7 MB ~48 MB static
Deno system JSC 54.2 MB 0
Deno quickjs-ng 56.1 MB ~1 MB static