vercel-labs/scriptc v0.4.3

on GitHub

0.4.3

Highlights

• Faster checking and smaller builds with tsc-ts 0.0.9: scriptc checks with tsc-ts 0.0.9, and builds reuse the bundled declaration files' diagnostics instead of checking them again. Small IR builds are 10.6 to 16.0% faster and small executable builds 5.5 to 7.6% faster, with identical output. A native build of tsc-ts with this release checks 0.4 to 6.6% faster than with 0.4.2 and peaks 4 to 16% lower.
• Integer arrays and loops:
  • Number arrays that only hold int32 values use 4-byte slots in locals, across direct calls and in module globals, and loop-carried locals written from their elements stay int32. A workload that walks arrays of cursors runs 54.5% faster.
  • Loops with two counters closing in on each other (for (let i = lo, j = hi; i < j; i++, j--)) and element copies through a[i]! run without per-element checks, and two-counter while loops run on integer counters.
  • Loops over typed arrays and charAt scans are versioned on their bounds, and ASCII strings are scanned as bytes.
• Less work for untyped and dynamic code:
  • String-keyed record reads under ?? and ! no longer allocate: a dictionary-walking workload makes no union boxes instead of 363,359 and runs 12 to 15% faster.
  • Checked-dynamic method calls dispatch on method ids, observed class methods call natively while their slot is unchanged, and calls on bag-tracked class instances skip building their views.
• Node.js parity:
  • crypto.getCipherInfo, AES-CCM, AES key wrap, the legacy createCipheriv modes, checkPrime/generatePrime, and Node's argument checks for generateKeyPair.
  • Streams: construct, writev, decodeStrings and defaultEncoding, including writev on Transform and PassThrough.
  • FinalizationRegistry, new.target, String.prototype.at on untyped values, Error.stackTraceLimit, spawnSync's env option, and class constructors called through call/apply throw Node's TypeError.
  • Records enumerate in the key order their object literal wrote, and objects converting to a union with an empty-record arm keep every field.
• npm packages: zod 3 compiles natively and zod 4's core runs, minified packages such as marked compile, chalk 5 and hot-shots 8 build from built-in shims, and @hono/node-server 2.x is built in. User code types npm package declarations at a checked, identity-preserving boundary.
• Builds: the cached build is reused after whitespace and comment edits, function bodies are emitted on forked workers, and the LLVM emitter reads its analyses from one recorded walk of each module.