Revert 3a27a92cb ("Forward at most four emit arguments through
EventEmitter method values") and 0cf62ebec ("Answer EventEmitter methods
read as values off compiled emitters"). Under the scope-B plan,
EventEmitter methods read as values, `EventEmitter.prototype.on` in
JavaScript and constructor-function emitters belong to Node islands, not
the native compiler. The typed/untyped listener sharing and the
catchable throw in place of the trap stay.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
A WebAssembly module the build finds but does not translate (one that uses
a proposal outside the translated feature set, an invalid one, or one the
translator rejects) now rejects with a CompileError that says the module
was found and names the reason, for example "it uses simd, outside the
translated WebAssembly feature set". Bytes the build did not see keep the
existing message.
The build emits the hash, length and reason of each such module in a
second table, scr_wasm_untranslated, next to scr_wasm_registry; the runtime
reads it when a lookup misses. WebAssembly.validate still answers false for
these modules, and the error stays a catchable CompileError.
Fixes#1617
Co-authored-by: jlucaso1 <55464917+jlucaso1@users.noreply.github.com>
A plain function's own properties (name, length, prototype, and the ones a
program assigns, as in `hash.outputLen = 32`) live in its property table.
Object.freeze, Object.seal and Object.preventExtensions of a function now
act on that table and answer the function, and Object.isFrozen,
Object.isSealed and Object.isExtensible answer from it, as in Node:
- Object.freeze of a function was refused as a possibly-aliased value,
and Object.isFrozen of one threw SC2020;
- Object.isExtensible answered false and Object.isSealed true for every
function.
Adding a property to a frozen or non-extensible function throws Node's
TypeError; assigning a read-only one throws the runtime's existing
read-only TypeError. Class constructors keep their fences. This lets
@noble/hashes' createHasher return its frozen hasher, so the sha256
program in the issue prints the digest Node prints.
Fixes#1437
Co-authored-by: saboursepideh <25549001+saboursepideh@users.noreply.github.com>
forEach, map, filter, some, every, find, findIndex, findLast,
findLastIndex, reduce and reduceRight compile on every typed-array kind
through one shared helper per method shape. The receiver, the callback and
reduce's initial value evaluate in order before the helper runs; the
helper reads the length once and each element when it visits it, so the
callback's writes show in later elements. Callbacks receive the element,
its index and the typed array (reduce's receive the accumulator first).
map and filter return a new typed array of the receiver's kind, map
storing each result with that kind's element conversion, and a Buffer's
map and filter return a Buffer. reduce without an initial value throws
Node's TypeError on an empty typed array. A thisArg keeps the fence, as
for arrays.
Fixes#1620
Co-authored-by: ejc3 <1694850+ejc3@users.noreply.github.com>
The dispatch instantiates one bridged emit per argument count and emitter
class; capping it at four keeps programs that only read emitter members
through computed keys from growing by the full table.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Reading an EventEmitter.prototype method off a compiled emitter (a program
class extending EventEmitter, or new EventEmitter()) through an untyped
value answered undefined (`typeof o.on`, `const f = o.on; f.call(o, ...)`,
`o.emit.bind(o)`), and EventEmitter.prototype.on in JavaScript was a fence.
Such reads, typed value reads, computed keys, `in`, and
EventEmitter.prototype.<method> now answer the runtime's
EventEmitter.prototype functions, the ones constructor-function emitters
inherit, so `o.on === o.addListener === EventEmitter.prototype.on` and
names and lengths match Node. The first read installs a program dispatch
that those functions call for a compiled emitter receiver; it invokes the
method through the existing untyped dispatch with the call's argument
count (emit forwards up to 16 arguments after the name, then fences).
An untyped emit on, or read of emit from, a class that overrides emit now
fences instead of bypassing the override for the native emit. A subclass
visited under the boxed EventEmitter capsule keeps its own dispatch plan
for values boxed as itself.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
crypto.createECDH returns a native ECDH handle backed by mbedTLS for
prime192v1, secp224r1, prime256v1, secp384r1, secp521r1, secp192k1,
secp224k1, secp256k1, brainpoolP256r1, brainpoolP384r1 and
brainpoolP512r1. generateKeys, computeSecret, getPublicKey,
getPrivateKey, setPrivateKey, setPublicKey and ECDH.convertKey follow
Node 24: compressed, uncompressed and hybrid points, input and output
encodings, the private key range, key pair validation, and Node's error
codes and messages.
Curve names follow OpenSSL's short-name lookup: names of other curves
from crypto.getCurves() are refused at compile time when literal and
throw a coded SC2020 error when computed, other OpenSSL short names
throw ERR_CRYPTO_OPERATION_FAILED, and unknown names throw
ERR_CRYPTO_INVALID_CURVE. Calls whose arguments no @types/node overload
accepts, and computeSecret(view, encoding), are refused at compile time.
The runtime unit scr_ecdh.c links, with the mbedTLS archive, only into
programs that use ECDH. wasm32-wasi builds refuse it.
The Limitations page partials keep one sentence per line so edits to
different sentences merge, but AGENTS.md's general Markdown rule asks
for paragraphs on one line, and changes that followed it conflicted with
the split text. AGENTS.md now names the partials as the exception, and
limitations-partials.mjs gains a check, run by pnpm lint, that fails on a
partial line holding two sentences, and a fix mode that splits such lines.
The one partial that held several sentences per line is split; Markdown
joins the lines, so the page renders the same.
hot-shots, a StatsD client compiled from its JavaScript, failed when a
program constructed a client. Each gap on its UDP path is closed
generically:
- Sloppy-mode functions with named parameters may read `arguments`
where the aliasing of their parameters cannot show: only
`arguments.length`, or element reads without parameter or element
writes.
- An `any` slot admits any boxable function value, including functions
with optional parameters (`C.prototype.m = function (...)` through an
untyped receiver).
- In a JavaScript file TypeScript does not check, a prototype method
takes its documented parameters as checked-dynamic values, as
constructors already did.
- JavaScript dgram sends run completion callbacks, buffer lists,
connected sends and the six-argument offset/length form.
- A dgram socket crosses into the checked-dynamic tree as a handle
(SCR_DYNH_DGRAM_SOCKET) whose methods are function values, with
untyped listeners that survive 'close'. The handle lives in its own
runtime unit (scr_dgram_dyn.c, the dgramDyn feature), linked only
when a program converts a socket to or from an untyped value.
- `String.prototype.concat` on strings, and `parseInt` over a possibly
missing or untyped value in JavaScript.
Corpus programs 6590-6596 and the hot-shots-udp npm
case (hot-shots 8.5.0 vendored) match Node in both lanes.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
`JSON.parse(text) as T`, `const x: T = anyValue` and `await res.json()
as T` threw `TypeError: expected X at $.path, got Y` when the value did
not fit `T`. Node never checks an assertion and continues with the value
it has, so the build-container listener rejected an order Node accepts
and a JWT with a string `exp` became a 500.
A failed cast now keeps its value when it initializes a `const`/`let`
binding declared in a function or block and only the code after the cast
reads the binding. That code (the statements after the cast in each
enclosing statement list, up to the declaration) lowers twice: the
static copy, unchanged, runs while the value fits; a dynamic copy, in
which the binding and everything derived from it is typed `any`, runs
after a failure, so missing members read undefined, wrong-typed members
keep their values, extra members stay visible in source order, and
objects keep their identity. The cast sets the flag that selects the
copy: the fused JSON.parse helper's slow path and the plain check call
scr_dyn_check_recover, which takes back the TypeError and parks the
value for checkedCast.fallbackTaken/fallbackTake.
A failed value that flows into a typed slot outside the region is
checked there, as any `any` value is: it continues when it fits and
throws at that use when it does not. A statement of the dynamic copy
with no `any` lowering becomes a runtime fence that throws only when a
failed value reaches it. Module-level bindings, regions with hoisted
declarations or super() calls, union targets and targets holding class instances, and
--tier=static-only (and library mode) keep the throwing cast.
`a?.b.c` on an `any` value now short-circuits only on `a`, so `.c`
throws when `a.b` is undefined, as in Node.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
An emitter used both through its static type and through an untyped
reference aborted: a typed `on` followed by an untyped `emit` (or a typed
`emit` from a class body reaching a listener added through `any`) hit
"computed event collided with a fixed event", and an untyped
`emit('error', ...)` trapped outright. Listener entries held either a
typed adapter or a checked-dynamic thunk, and the emit core trapped when
an entry lacked the form the emit carried.
Entries may now carry both forms. Listeners registered through
scr_emitter_on_dyn keep their thunk beside the typed adapter; typed
emits call the adapter and untyped emits call the thunk with the
arguments as given. The class dispatch of compiled emitters registers
untyped listeners under an event typed code fixes with a typed adapter
for its tuple, and converts the arguments of an untyped emit of such an
event to the tuple for listeners with typed parameters
(scr_emitter_emit_mixed; a mismatch throws the checked conversion's
TypeError). Registrations and emits through untyped values otherwise go
through scr_emitter_on_any/emit_any: runtime adapters under 'error' and
the meta events, and Node's unhandled-'error' contract. The emit core
throws instead of trapping when an entry has no usable form. The
dynamic half of the registry sits behind a hook only on_any installs,
and on_flex/emit_flex keep their plain behavior, so programs without
untyped emitter calls link none of it.
listenerCount, eventNames, removeAllListeners, listeners, rawListeners,
setMaxListeners and getMaxListeners through an untyped value on a
compiled emitter answered "is not a function"; they now dispatch to the
native registry.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
In JavaScript, `ReleaseEmitter = EventEmitter` over `const EventEmitter =
require("events")` was refused with SC1090 ("a runtime-provided class value
as an untyped value"), and `class Channel extends require("events")` failed
on the require call as a value. Bundled npm code does both, for example a
small semaphore that aliases EventEmitter and constructs its release channel
through the alias.
- The events module binding and the EventEmitter or stream class itself
turn untyped as the runtime's untyped constructor that constructor
functions already use (scr_dyn_builtin_class.c). `new` through it builds
an emitter object with Node's listener API, and `===` against the class
compares identity.
- `x instanceof EventEmitter` on an untyped value also recognizes a boxed
compiled emitter (an instance of a program class extending EventEmitter),
which the prototype test alone answered false for. The same holds through
an untyped binding narrowed to the class.
- `class X extends require("events")` extends the runtime emitter, as
through a require binding.
- A typed array of the class built from such values (`[EventEmitter]`) is
refused with SC1090 rather than failing its class check at run time.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
pipe() into an untyped destination now comes from main's pipeIntoDyn
(stream.unboxDyn); programs with constructor-function streams unbox
through scr_dyn_builtin_stream.c, which also takes those streams, so the
separate dyn.builtinStreamPipe entry point is gone.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Bundled npm code (from2, bl, tar-stream, yazl, multistream) builds its
streams as ES5 constructor functions: util.inherits(Ctor, Readable) and
Readable.call(this, opts), with _read/_write/_transform on the
prototype. Readable.call(this) threw SC2020.
A new runtime unit, scr_dyn_builtin_stream.c (feature
dynBuiltinStream), gives the untyped stream constructors their stream
half. Base.call(this, opts) creates a runtime stream over the receiver
and keeps it in a hidden slot; the runtime calls the receiver's
underscore methods through its property lookup; the stream prototypes
carry Node's methods and accessors over the hidden stream; and
EventEmitter's methods register listeners with the runtime stream's
emitter, so runtime events and pipes reach JavaScript listeners with the
receiver as this. _readableState/_writableState are live views.
Stream class values now come from dyn.builtinStreamClass, so only
programs that use them link the stream half. Typed code sees these
objects as their runtime streams: checked casts to the stream classes
take them, readable.pipe() into an untyped destination pipes into them,
and runtime streams crossing into JavaScript answer the constructor
object.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
- Merge origin/main (e9fb01603); the import lines at the top of
lowerer.ts conflicted and both are kept.
- Corpus 6385 gains a wrapper whose block-local `args` alias shadows an
outer one in the same function; each call forwards its own arguments.
Externrefs a guest holds are borrowed pointers. An import's result was
kept only until the outermost call returned, which was before the export
call converted its results to JavaScript, so a result created by an
import was freed before conversion. A table or global slot released the
reference it replaced at once, although the guest may still hold it in a
local after reading the slot. The kept references are now released after
the outermost caller has converted its results (scr_wasm_leave), and a
table or global store during a call keeps the reference it replaces until
then.
Checked memories (explicit bounds checks: sanitized builds, Windows)
grew with realloc, which can move the storage that memory.buffer and its
views alias. They now reserve the address space for their largest size
(mmap on POSIX hosts, VirtualAlloc on Windows) and commit pages as they
grow, so the base never moves. Hosts without address-space reservation
grow in place only until a buffer has been handed out; after that,
growth that would move the storage fails.
Tests: webassembly-externref-lifetimes.mjs (import results through an
export, table and global references replaced by the guest and by
JavaScript), webassembly-memory-growth.test.ts (views written after
growth from JavaScript and from the guest), and translate.test.ts cases
for memargs naming memory 0 explicitly and for local.tee operand types,
which b3bcbaaf7 made consistent with validation. Under SCRIPTC_SAN=1 the
two runtime tests report heap-use-after-free without these changes.
Merges main; internal/compatibility/generated/node-v24-backlog.json is
regenerated with pnpm node-compat.
The fallback declaration of events.once takes NodeJS.ReadableStream and
NodeJS.WritableStream emitters like @types/node does. The diagnostics
fixture now pins the forms that stay refused (options that are not an
object literal, a computed name, a stream's 'data' event), and the
limitations page states the supported events.once forms.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
- matchInferSignature reads a fixed-tuple rest as its positions, so
(...args: [string, number]) needs two arguments, and a positional
any[] pattern parameter matches only when the function's parameter
there accepts an array, as TypeScript's assignability does
(corpus 6398).
- Merge origin/main (200fe8d22); node-v24-backlog.json regenerated.
- Merge origin/main (e1c27176a).
- matchInferSignature answers false when a function needs more arguments
than a fixed-parameter pattern passes, as TypeScript's assignability
does (corpus 6398).
- Record corpus costs for the programs this change adds.
Chris Tate