Chris Tate
f945efecee
In JavaScript sources, WritableStream with its default writer and controller, TransformStream with its controller, pipeTo and pipeThrough, and TextEncoderStream and TextDecoderStream join the native web stream classes, following Node 24's webstreams step by step: sinks and transformers, backpressure and the writers' ready and closed promises, abort with the controller's signal, the pipe's shared write requests and its abort signal, and UTF-8 encoding and decoding across chunks settle in Node's order. The streams take own properties, which a pipe does not use for its own reads and writes, and the global object answers the classes by computed name in programs that name them. A JavaScript class that extends one of these classes keeps the SC1090 refusal, and TextDecoderStream refuses encodings other than UTF-8. The node24-web-stream lifecycle, errors, queues, transforms, pipes, pipe-errors, pipe-abort, tee and encoding cases now match Node.
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.