vercel-labs/scriptc v0.2.7

on GitHub

0.2.7

Features

• Supported import cycles initialize in module evaluation order. Compiled modules preserve shared instances, hoisted function calls, and temporal-dead-zone checks across cyclic imports.
• Typed returns carry more native values. Optional values, never-returning calls, and native collection iterators retain their supported behavior across typed function boundaries.
• Native terminal and filesystem metadata expands. Standard terminal stream properties and filesystem error fields are available in supported static workflows.
• An opt-in speed mode trades executable size and build time for runtime performance. --optimization=speed enables runtime inlining, inline reference counting, and x86-64 runtime alignment while preserving the default release mode.

Performance

• Native allocation and cycle collection do less work. A small-object allocator serves strings, arrays, and records; safe allocations and releases are emitted inline, and cycle scans back off for long-lived graphs while keeping static executables small.
• Arrays, collections, and callbacks avoid repeated work. Large dense arrays avoid the former sparse-storage cliff, direct element access and callback calls reduce boxing, and string-keyed Maps reuse cached hashes. Optional element reads and captured parameters avoid temporary wrappers where safe.
• JSON, numbers, and regular expressions use more direct native paths. Supported typed JSON parses directly into records, common number conversions use specialized paths, and regular expressions reuse compiled patterns and subject decoding with a native matcher for supported ASCII subjects.
• Async execution and native I/O reduce overhead. Supported await-free async functions avoid fibers, fiber switches save only required registers, HTTP responses coalesce headers and bodies, and console and process streams write directly to descriptors.

Fixes

• Class, record, and callback values preserve more JavaScript behavior. Class references retain identity through unions and collections, adapted callbacks remain the same function, and record field presence stays distinct from an explicit undefined value. Data-property writes no longer incorrectly mark unrelated class methods as replaced.
• Console line buffers account for concatenated string parts. Long template literals and string concatenations reserve sufficient space before output.
• Native program objects use runtime ABI v8. External object consumers must link the matching v0.2.7 runtime pack; the versioned marker rejects incompatible runtime objects at link time.