vercel-labs/scriptc v0.4.4

on GitHub

0.4.4

Highlights

• Fixes for 0.4.3:
  • Unchanged rebuilds hit the frontend cache again. An unchanged rebuild of a 23-module program takes 93 ms instead of 1.26 s, and of tsc-ts (dev) 1.6 s instead of 58.2 s.
  • The native compiler builds programs with several typed-array accesses at one masked index in a loop again, including tsc-ts's release build, which failed with SC3004.
  • x! returned from a function, used as an arrow function's result, or passed as an argument keeps null or undefined when the destination type holds it, as JavaScript does. x! operands of +, += and other conversions that hold undefined or null convert as Node does.
  • Effect 4 programs whose generators yield clients built by other generators run again.
  • The cache for untyped property access in programs that declare classes is reverted, fixing a crash in Effect 4 observability programs.
• Faster:
  • Number compares and typed-array indexes use the exact integer of sums like i + 1: a heap sift-down over an Int32Array runs 17.5% faster.
  • glibc's per-thread heaps use huge pages: the VS Code type-check runs 3.4% faster.
  • Mid-size executables (over 1 MiB of LLVM text) build in at least eight partitions: the LLVM backend phase takes 34 to 74% less time for three.js programs of 1.4 to 7.8 MB.
  • JavaScript class instances are boxed at their exact class, and stores into nested string-keyed dictionaries keep class method calls direct.
  • --target-cpu selects an x86-64 microarchitecture level.
• Node.js parity:
  • X25519 keys and crypto.diffieHellman; existsSync and fs.promises accept file: URLs; Buffer.from ranges over ArrayBuffers, the deprecated Buffer() constructor and Buffer as a value.
  • Dates are objects with identity; Promise.all over different entry types settles on Node's turns; completion callbacks run in their call's AsyncLocalStorage context.
  • TypedArray methods run on typed arrays held as untyped values, and unions of typed-array classes compile. Borrowed TypedArray.prototype.set calls compile and throw Node's TypeError for other targets.
  • Split CommonJS require bindings, __-prefixed exports, string-key destructuring of any values, and record key order for values JavaScript built.
• npm packages: zod 4 and @hono/zod-validator values are projected at the declaration boundary.