vercel-labs/scriptc v0.3.2 on GitHub

0.3.2

EventTarget, Event and CustomEvent are supported, with Node's dispatch order, once/passive/signal options and listener error reporting. AbortSignal uses the same implementation, and events.errorMonitor and events.addAbortListener are supported.
Promise.allSettled and Promise.any are supported in typed and JavaScript code, with Node's microtask order, AggregateError, and PromiseSettledResult records. JavaScript combinators adopt thenables.
yield* delegates to arrays, strings, Sets and Maps, forwards typed next values, return() and throw(), and a finished generator's .value reads as undefined.
The global console is complete: assert, count/countReset, dir/dirxml, group*, table, time/timeLog/timeEnd, clear and profile/timeStamp print Node's output.
node:os is complete, and path.parse, path.format and path.matchesGlob are supported for the posix and win32 families.
util.inherits, util.deprecate, util.callbackify and util.debuglog follow Node 24, including NODE_DEBUG, process.noDeprecation and process.throwDeprecation.
LifetimeRegion in @scriptc/experimental frees ProgramLifetime instances one generation at a time. A watch-style compiler benchmark stays at 190 MB after 10 builds.

Short-lived number records and objects live in the function's frame. Records and small class instances with number and boolean fields that are only read, updated by their own methods, or returned unchanged are not heap-allocated, including results of functions that return a fresh object.
Maybe-missing number reads stay unboxed, and directly called functions returning number | undefined return the tag and payload in registers.
Arrays and objects use less memory. boolean[] stores one byte per element, small appended arrays keep their first elements in the array's own block, and cycle-capable objects carry an 8-byte header instead of 16 bytes.
Sorting with a recognized numeric comparator sorts by key without calling the comparator, for number[] and arrays of records or class instances.
Regex replace, match and capture reads are faster. Compiled matchers write replacements directly, and captures that are only compared or converted to numbers are not copied into strings.
for...in, Object.keys and Object.entries over values typed unknown or any build native arrays from the record layout or the object's own keys.
Calls through function-typed class fields box the receiver only when the callee reads this.
Indexed non-ASCII string scans, split(""), template literals and join are faster.

Strings keep lone UTF-16 surrogates. Strings are stored as canonical WTF-8, so lone surrogates survive literals, split(""), charAt, slice, fromCharCode and JSON.parse, and output streams write them as U+FFFD as Node does.
A var read before its first store reads undefined, and classes used before their declaration runs throw a ReferenceError.
Reflection over typed values seen as unknown matches Node: in sees prototype members, for...in walks class instances, typed records work as prototypes, and JSON.stringify accepts array replacers.
Microtask and event order match Node for Promise.all, Promise.race, async generator returns, and fork IPC exit, disconnect and close events.
Module initializers that only ++ or -- a binding run.
Native program objects use runtime ABI v20. Array and object layouts changed, so external object consumers must link the matching v0.3.2 runtime pack; the versioned marker rejects incompatible runtime objects at link time.