Malte UblandClaude Opus 5.5
5c1f32f5f1
A stream's "data" payload arrives as checked-dynamic, and decoder.write/ decoder.end fenced it (SC2020 'StringDecoder.write of 'unknown' data'). The dyn route reads the chunk as Node does: a string returns unchanged without touching the buffered state, an ArrayBufferView (Buffer, TypedArray, DataView) decodes through the existing per-encoding helpers with the packed-f64 pending state threaded through, and anything else throws ERR_INVALID_ARG_TYPE for "buf" with Node's message. The two runtime entries live in scr_bytes.c beside their static twins and share the same `StringDecoder.write`/`end` lowering, so a program that only ever passes typed chunks keeps the existing libCalls (zero-cost). Corpus 8428 pins the string pass-through, the utf8/base64 state across an interleaved string chunk, and both argument-type errors against Node. This commit also carries this wave's compatibility evidence: the fs, url and string_decoder corpus programs are recorded in static-support.json and the ledger is regenerated with pnpm node-compat --local. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Node compatibility ledger
This workspace package owns scriptc's Node.js parity system.
node-v24.jsonpins the Node release tag, commit, and canonical docs/source inputs.static-support.jsonoverlays dedicated compiler paths and their internal test evidence on the compiler's generated surface manifest.generated/node-v24-internal.jsonis the engineering ledger, including implementation evidence and repository test paths.pnpm node-compat:backlogderives the internal tier-specific work queue from the ledger; it is not committed. It separates verification, implementation, explicit-refusal replacement, and partial-surface audit work, and prioritizes stable Node APIs above experimental, deprecated, and legacy APIs.docs/src/generated/node-v24-compatibility.jsonis the stripped public artifact consumed by the docs website. It contains compiler-relevant runtime APIs, statuses, verification bases, and user-facing details; documentation, metadata, command-line/configuration entries, and rows that are N/A for native execution remain internal.
Statuses are evidence-aware: supported and partial require test evidence; refused requires an explicit compiler diagnostic or native throwing stub; not-implemented is the actionable backlog for an owned API family with no implementation match; by-design records an architectural exclusion; unreviewed still needs classification; and not-applicable is not a runtime API for that execution tier.
Run pnpm node-compat:backlog from the repository root for a summary. The filters --tier, --action, --priority, --chapter, and --status compose; use --format=json or --format=tsv for tooling.
Run pnpm node-compat from the repository root after changing the Node pin or the support manifest. pnpm node-compat --local does the same without network access while the pin is unchanged, by reclassifying the committed ledger rows; after a merge, node scripts/regen-generated.mjs regenerates every generated file instead of a hand merge. pnpm node-compat:check is the offline drift/evidence gate; pnpm --filter @internal/compatibility check:upstream additionally verifies the pinned upstream inputs over the network.
npm packages that compile as builtins
The ledger counts Node APIs, so npm packages that compile as a Node builtin have no rows. packages/compiler/src/frontend/builtin-package-aliases.ts lists them, each with the checked major versions and the reason its module is that builtin on Node 24. One entry is a documented divergence rather than an identity: readable-stream 2.x, 3.x and 4.x compile as node:stream; for 2.x and 4.x that is the package's READABLE_STREAM=disable behavior. Without that variable Node runs the package's own JavaScript streams. The tests/corpus/readable-stream-disable program pins the disabled behavior. 3.x, a copy of Node 10's streams, cannot run disabled on Node 24 (its disable branch throws), so tests/corpus/readable-stream-3 pins only behavior its own streams share with the builtin.