Issues

• Support checked narrowing for explicitly annotated Array.filter type predicates

  vercel-labs/scriptc#1680 · Filter by author jlucaso1 opened on Oct 21, 2026

• Support WebAssembly SIMD instructions in ahead-of-time translation

  vercel-labs/scriptc#1679 · Filter by author jlucaso1 opened on Oct 21, 2026

• wasm-bindgen package initialization stops at FinalizationRegistry before WASM initialization

  vercel-labs/scriptc#1678 · Filter by author jlucaso1 opened on Oct 21, 2026

• String-literal element access on the right of an any destructuring declaration is refused

  vercel-labs/scriptc#1677 · Filter by author jlucaso1 opened on Oct 21, 2026

• Clarification / RFC: BigInt(Uint8Array) lowering parity and documentation of runtime-optional storage rules

  vercel-labs/scriptc#1647 · Filter by author espetro opened on Oct 21, 2026

• Expose provenance/reason when type narrowing is bypassed by runtime-optional storage analysis

  vercel-labs/scriptc#1646 · Filter by author espetro opened on Oct 21, 2026

• SC2020 diagnostic formats IR storage union instead of checker-narrowed type, displaying phantom 'undefined' arm

  vercel-labs/scriptc#1645 · Filter by author espetro opened on Oct 21, 2026

• Record index-signature read widens callee parameter, causing SC2020 refusal despite typeof guard (0.4.0 regression)

  vercel-labs/scriptc#1644 · Filter by author espetro opened on Oct 21, 2026

• Feature Request: Compile TypeScript to Node-API addon, without node-gyp

  vercel-labs/scriptc#1643 · Filter by author toyobayashi opened on Oct 21, 2026

• Generic arrow bindings inside functions: uses that run before the initializer diverge from Node

  vercel-labs/scriptc#1642 · Filter by author ejc3 opened on Oct 21, 2026

• Evolving empty array: an alias taken before a write of another element type stops seeing later writes

  vercel-labs/scriptc#1641 · Filter by author ejc3 opened on Oct 21, 2026

• Element writes with an undefined index write the "NaN" property instead of "undefined"

  vercel-labs/scriptc#1640 · Filter by author ejc3 opened on Oct 21, 2026

• Error SC3004: spawnSync zig ENOENT

  vercel-labs/scriptc#1636 · Filter by author jgranduel opened on Oct 21, 2026

• Array reduce: accumulator narrower than the callback's or initial value's runtime type, and arguments.length in the callback

  vercel-labs/scriptc#1628 · Filter by author ejc3 opened on Oct 21, 2026
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• WeakMap and WeakSet operations scan every entry, so filling one is quadratic

  vercel-labs/scriptc#1619 · Filter by author ejc3 opened on Oct 21, 2026

• Test262 survey (static-adapted-v5): per-chapter results on main vs integration branch

  vercel-labs/scriptc#1472 · Filter by author cramforce opened on Oct 20, 2026

• http.Server: 'connect' (and 'upgrade') events not available

  vercel-labs/scriptc#1439 · Filter by author saboursepideh opened on Oct 20, 2026

• node:crypto: no asymmetric keys/signing (generateKeyPairSync, sign), X509Certificate fields, or globalThis.crypto.subtle

  vercel-labs/scriptc#1441 · Filter by author saboursepideh opened on Oct 20, 2026

• node:tls: SNICallback, new tls.TLSSocket(socket, {isServer}), and ALPNProtocols not supported

  vercel-labs/scriptc#1438 · Filter by author saboursepideh opened on Oct 20, 2026

• Performance issue when compiling an object literal with a computed key (workaround 148x faster)

  vercel-labs/scriptc#1409 · Filter by author ainslec opened on Oct 19, 2026

• Perf issue storing a dictionary into a record's nested dictionary under a computed key (workaround 144x faster)

  vercel-labs/scriptc#1408 · Filter by author ainslec opened on Oct 19, 2026

• No SIMD emitted for typed-array dot-product / MAC loops (0 vector instructions in a 431 KB A64 binary)

  vercel-labs/scriptc#1388 · Filter by author croissantsam opened on Oct 19, 2026

• Compiler panics when compiling zod >= 4.5.0: 'null is not representable in the target union'

  vercel-labs/scriptc#1376 · Filter by author hangtiancheng opened on Oct 19, 2026

• Support Object.freeze / Object.isFrozen on native records passed through unknown (SC2020)

  vercel-labs/scriptc#1374 · Filter by author blurname opened on Oct 19, 2026

• Support structural constructor return types with static members

  vercel-labs/scriptc#1372 · Filter by author blurname opened on Oct 19, 2026