InternTable keys can be arrays of numbers or of strings, compared by their
elements: numbers by SameValueZero, strings by content, and holes equal to
each other only. The runtime stores an array key as one byte string that
encodes its elements; the Node.js implementation encodes it into a Map key
the same way.
Replaced table indexes are now freed. Every thread that uses a table
records the epoch it read at the start of each lookup and insert, and an
index retired in an earlier epoch than every recorded one is freed. Worker
threads stop holding retirements back when they exit.
Number indexes keep a tag byte per slot ahead of the key and value pairs,
so a lookup of an absent key reads the dense tag bytes instead of pairs.
getOrInsertComputed lowers an arrow callback with an expression body in
place, with its parameter bound to the key, so interning through
`(key) => new T(...)` creates no closure.
@scriptc/experimental exports InternTable<K, V>: a named table that every
thread of a scriptc program shares and that each thread has its own copy
of under Node.js. Keys are strings or numbers with Map equality; values are
published (@scriptc/threads) when stored, and the first stored value of a
key is kept. Members are get, has, size, getOrInsert and
getOrInsertComputed.
The runtime table (scr_itable.c) splits each table into 64 segments.
Lookups take no lock and do not write; inserts take a segment's spin lock
for a probe and a few stores, and callbacks run without a lock. Number
tables keep keys and values in the index; string tables keep entries in
segment-owned chunks behind tagged slots. Replaced indexes are kept.
The compiler lowers the class to a synthetic class with one f64 handle
field and five intrinsics, with interned helpers per member and type and
an in-place lowering of getOrInsertComputed that creates a function
expression callback only on a miss. Stored values go through the publish
intrinsic, so their types get the write guard. scriptc refuses names that
are not string literals, one name opened with different type arguments,
and key or value types a table cannot store.
scr_publish walks small graphs in inline buffers and reads
SCRIPTC_PUBLISH_TRACE once, instead of allocating and calling getenv on
every call.
createCipheriv, createDecipheriv, update(), setAAD() and setAuthTag()
now read the value a typed-ref box holds when it is a string, view,
ArrayBuffer or KeyObject. ERR_INVALID_ARG_TYPE names the class of a
class instance that arrives through an untyped value, as Node does,
instead of Object. An unknown output encoding that is not a string is
rendered as Node's %s formats it (util.inspect at depth 0, or the
object's own toString); a function, or an instance of a class that
defines toString, throws a coded SC2020 error. Cipher programs link the
inspect unit for that rendering.
5250 passes each argument through `any`, including class instances,
records and arrays that Node rejects, and 5254 covers output encodings
that are not strings from JavaScript.
pipeline() accepts a run of async generator function stages between
streams, following pipeline.js: each stage is called during setup with the
previous stream (a Readable is async iterable) or the previous stage's
generator, and the last generator is pumped into the next stream with
pumpToNode's write, drain and end waits. An error in the pump loop returns
the generator before the pipeline finishes, so the stage's finally runs.
A stage's source parameter is typed as what the pipeline passes it and may
only head for await loops. Function sources and destinations, stages that
take the signal argument, and stages separated by streams are refused.
Readable.from accepts sync and async generators of strings and Buffers,
following from.js: values are pushed while push() accepts, an async
generator's next() promise is awaited once per value, and destroy runs
the generator's throw() and return() before the destroy callback.
for await over a stream follows createAsyncIterator: the loop registers
its 'readable' listener, reads through read(), and a parked loop wakes
through the 'readable' tick. push(null) before the first read ends the
stream after the next read, finished() answers an already settled stream
with its result on a nextTick, read(0) on an object-mode stream reads
nothing, and write(string, 'buffer') throws ERR_UNKNOWN_ENCODING.
- getProtocol() answers the negotiated version ("TLSv1.2" or
"TLSv1.3"), the highest version on offer before the handshake as
OpenSSL does, and null after close.
- getCipher() answers { name, standardName, version }: OpenSSL's name
for the negotiated suite, its IANA name, and the suite's minimum
protocol version. A suite without a known OpenSSL name throws the
"not supported yet" error.
- alpnProtocol is null before the handshake, then the negotiated
protocol or false.
- tls.DEFAULT_MIN_VERSION and DEFAULT_MAX_VERSION are 'TLSv1.2' and
'TLSv1.3', and the bundled declarations type the server's
secureConnection socket as a TLSSocket.
- The limitations page notes that a typed getCipher() read before the
handshake or after close throws where Node answers undefined or null.
Corpus 5651 covers each case.
- dns.lookup(hostname, callback), lookup(hostname, family, callback)
and lookup(hostname, options, callback) with family (0/4/6, 'IPv4',
'IPv6'), all, order and verbatim, validated with Node's messages.
getaddrinfo answers any family, ordered verbatim or one family first;
literal addresses answer on the next tick, an empty hostname gives
Node's null answer and DEP0118 warning, and failures carry code,
errno, syscall and hostname.
- dns.lookupService(address, port, callback) checks the address and
port as Node does and answers getnameinfo's host and service.
- dns.getServers() lists the nameservers in /etc/resolv.conf, and
getDefaultResultOrder/setDefaultResultOrder keep the default order
('verbatim').
- A typed callback receives "" and NaN (or []) after a failure, where
Node passes undefined; the limitations page says so.
Corpus 5648-5650 cover each case; the options-record diagnostics no longer
list the all and hints options as refused.
- server.close() closes idle keep-alive connections, and every open
connection closes after keepAliveTimeout + keepAliveTimeoutBuffer, so a
closed server whose clients keep their connections no longer stays up.
The Keep-Alive response header gives keepAliveTimeout in whole seconds
and is omitted when it is 0.
- A client request through an Agent with neither keepAlive nor a finite
maxSockets sends Connection: close.
- "socket hang up" and "aborted" errors carry code ECONNRESET, a client
head over the header limit fails with HPE_HEADER_OVERFLOW, and TLS
verification failures carry their openssl code.
- Outgoing header values keep the type they were set with: getHeader and
getHeaders answer numbers and arrays, appendHeader turns an existing
value into an array, and setHeader(name, string[]) writes one line per
element.
- Repeated incoming header fields join with ", " ("; " for cookie),
Node's single-value fields keep the first value, and set-cookie reads
as an array under @types/node, on server requests and client responses.
Fetch reads response headers line by line.
- Expect: 100-continue is answered with 100 Continue before 'request';
other expectations answer 417.
- HEAD requests and 1xx/204/304 responses send no body or length header,
and HTTP/1.0 requests without a set length get an unframed body and
Connection: close.
- The 16 KiB maxHeaderSize applies to the request target plus header
names and values (431 on the server).
- https.Agent TLS options are refused by name instead of being dropped,
and server.address() lowers for @types/node's
string | AddressInfo | null result.
Corpus 5555-5563 and the node-types http-headers-address fixture cover
each case.
wasm32-wasi executables always compiled their program as one LLVM module,
so the object step of a large program ran the whole O2 pipeline and code
generation on a single thread. Native targets divide a module of more than
4 MB of LLVM text into up to 64 partitions that the helper optimizes and
compiles concurrently, importing small functions across partitions for
inlining. Nothing in the helper or the link plan is specific to native
objects: partitions link as ordinary objects with wasm-ld.
nativeProgramPartitions now applies the same size rule to every target and
no longer takes the target. A WASI test emits a program whose internal
callees, state and table entries land in different partitions, at release
and dev optimization, and checks that the partitioned objects are
deterministic and link to the same program as one object.
The three glob entry points run a port of Node 24's
lib/internal/fs/glob.js walk in scr_glob.c: the same LIFO queue of
(path, patterns) items over the sorted directory listings, the same
lstat, stat, readdir, realpath and seen-pattern caches, the same result
set in insertion order, and the same exclusion checks, so matches come
out in Node's order. Patterns compile with the existing minimatch port.
glob_match is split into a compile step and a test step so the walk can
reuse each compiled pattern and test it segment by segment.
nocaseMagicOnly is now an option, because exclude patterns turn it off.
Patterns (a string or string array) and options (cwd as a path or
file: URL, exclude as patterns or a function, followSymlinks,
withFileTypes) are validated in Node's order with Node's errors,
including the internal assertion Node hits for a non-string cwd with
exclude patterns. withFileTypes results are Dirent rows: name,
parentPath and the type probes. parentPath follows Node's rule for each
form: the joined path for globSync, the resolved path for fs/promises
glob.
fs.glob checks the callback and validates synchronously, then delivers
string[] or the walk's error through the filesystem callback queue.
fs/promises glob lowers as the source of a for await loop. The walk runs
when the loop starts, and the matches found before an error bind before
the error is thrown, as Node's async iterator yields them first. The
older glob(3)-based fs.glob branch is removed.
Corpus 5448-5452 and a node-types fixture check the behavior against
Node.
Release builds now emit the string retain and the dyn retain and release
fast paths inline. The dyn release decides the cases scr_dyn_release
decides by kind and calls scr_dyn_release_survivor for capsules and
handles. String releases and the other families stay runtime calls, as
string-heavy programs have many release sites. The speed posture keeps
every fast path and gains the dyn release. The runtime ABI version moves
to 21 because program objects call the new runtime entry point.
docs/content/docs/limitations.mdx now holds the frontmatter, the
headings, the anchor spans and one <include> line per partial. The text
moves unchanged to docs/content/limitations/: one file per labeled
bullet (<section>/<label>.mdx) and one per section's other text
(<section>.mdx). Edits to different bullets no longer touch adjacent
lines of one file.
remarkDocsConventions splices the included partials into the page and
joins the lists that consecutive bullet partials contribute, so the page,
its Markdown twin and the search index render as before. The route tests
read the page with its partials inlined. A page that includes partials
takes its last-modified date, used by the sitemap, from the newest commit
to the page or any of its partials.
docs/scripts/limitations-partials.mjs joins the partials back into one
file, splits a single-file page, and merges a branch's edits to the
single-file page into the partials.
Assertion failures throw an assert.AssertionError with Node 24.22's
generatedMessage, code, actual, expected, operator and diff properties,
in Node's key order. new AssertionError(options) validates its options
and builds Node's message from operator, actual and expected.
AssertionError type annotations, instanceof and assert.throws(fn,
AssertionError) compile.
Failure paths record actual, expected and operator before they throw;
passing assertions do no extra work. The deep forms lower through a
per-type function that returns the verdict, so the operands stay call
temporaries. assert.equal and notEqual inspect their operands only when
they fail.
Values without a checked-dynamic form, and values whose type can be
cyclic, record undefined.
- Object.keys(util.types) lists Node's 43 keys in Node's order, and
Object.keys over the node:util/types namespace lists them sorted with
"default". Object.values and Object.entries over util.types are refused,
because some members do not compile yet.
- The HTTP server answers 431 Request Header Fields Too Large when a head
or trailer block exceeds 1000 fields or the header byte bound, and the
trailer block counts its fields on its own, like Node. Parser errors send
Node's fixed responses without a Content-Length header.
- Server requests start paused like Node's IncomingMessage: body bytes and
'end' wait for a 'data' listener, pipe() or resume(). When the response
finishes, an unread request is dumped and emits 'end', before the
response's 'close' for an empty body and after it otherwise. A body that
is still arriving when the response finishes keeps reaching its
listeners. req.complete reads true once the body has arrived.
- Document that small Buffers own exact-size ArrayBuffers instead of
sharing Node's 64 KiB pool.
Corpus 5405-5409 cover each case.
Chris Tate