Contributions: Sep 13–20, 2026

34 substantial PRs (20 merged, 15 open/draft). 23 in workerd, 11 in node.

workerdMerged#7421

Drop what a queued stream enqueues once every consumer is collected

Fixes an issue where a push source continues to enqueue into a queue with no cursor after all consumers are collected

workerdMerged#7417

Error both halves of a transform pair from the Node.js interop hook

Errors both halves of a transform pair from the Node.js interop hook to handle abort signals correctly

workerdMerged#7412

Transform a parked TransformStream write after one backpressure wait

Fixes a transform sink's write algorithm to wait for backpressure only once, improving performance

workerdMerged#7409

Improve TS stream primordial safety

Improves the safety of TS streams by filling gaps in primordial/prototype pollution protection

workerdMerged#7405

Add a ring buffer for the streams' internal queues

Replaces internal arrays with a ring buffer to improve performance of streams' internal queues

workerdMerged#7399

Stop identity stream aborts from waiting for a read

Fixes issue with identity stream aborts waiting for a read, preventing abort and write from settling.

workerdMerged#7395

Keep native pipes from consuming a destination with pending writes

Prevents native pipes from consuming a destination with pending writes, fixing issue with released descriptors and hung reads.

workerdMerged#7391

Fix handling of pipe draining backpressure

Fixes handling of pipe draining backpressure by introducing a private hook and removing unnecessary promises and awaits.

workerdMerged#7389

Handful of TS streams byob and tee fixes

Applies fixes to byob handling with tee and partially filled responses in TS streams.

workerdMerged#7344

Destroy Readable.fromWeb on a chunk it cannot push

Destroys Readable.fromWeb on a chunk it cannot push, with additional streams tests and fixes.

workerdMerged#7343

Support web streams in stream.compose()

Added support for web streams in stream.compose() with additional tests and fixes.

workerdMerged#7342

More node:streams tests and fixes

Added more tests and fixes for node:streams

workerdMerged#7341

Add node:http client suite

Added node:http client suite for streams tests and fixes

workerdMerged#7340

node:http server test suite

Added node:http server test suite for streams-related tests and fixes

workerdMerged#7339

Add node:net suite

Added node:net suite for streams-related tests and fixes

workerdMerged#7295

Expand js-rpc streams test coverage

Expanded test coverage for js-rpc streams to improve reliability

workerdMerged#7338

Support web streams in stream.pipeline()

Added support for web streams in stream.pipeline() to improve stream handling

workerdMerged#7336

Add node:stream web-interop suite

Added a new test suite for node:stream web-interop to ensure compatibility

workerdMerged#7335

Pin error() during a pending close in the readable stream suites

Fixed readable stream behavior to pin error() during pending close, aligning with spec

nodeOpen#66138c++semver-minorlib / src

src: add --process-timeout=N

Add --process-timeout=N flag to set a time limit on a Node.js process

nodeOpen#66132semver-majorlib / srcneeds-ci

src,lib: add --allow-env permission

Add --allow-env permission to control environment variables when --permission is on

nodeOpen#66117c++lib / srcauthor ready

src: ensure Socket(fd) cannot bypass allow-net permission

Ensure Socket(fd) respects --allow-net permission when using --permission

nodeOpen#66115c++semver-minorlib / src

perf_hooks: add options to monitorEventLoopDelay()

Add options to monitorEventLoopDelay() to tune histogram parameters

nodeOpen#66114c++semver-minorperf_hooks

perf_hooks: allow RecordableHistogram to record 0

Allow RecordableHistogram to record 0 values

nodeOpen#66099c++semver-minorlib / src

perf_hooks: add histogram snapshot and diff

Added histogram snapshot and diff functionality to perf_hooks, allowing for capturing and comparing histogram states.

nodeOpen#66098c++semver-minorauthor ready

perf_hooks: harden histogram CBOR import validation

Improved histogram CBOR import validation by introducing version 2, which supports optional unknown fields.

nodeOpen#66097c++author readyneeds-ci

perf_hooks: fix PerformanceObserver handling

Fixed PerformanceObserver handling to prevent counts from getting out of sync, which could lead to segfaults.

workerdOpen#7426

Walk the queued stream's cursors by index and skip the pinned cursor

Optimize StreamQueue cursor iteration by walking by index and skipping the pinned cursor.

workerdOpen#7425

Buffer the compression stage's output in blocks released as they are …

Buffer compression stage output in blocks to reduce memory usage and prevent unbounded chunks.

workerdOpen#7424

Copy body bytes out as they arrive and cancel the source when consump…

Improve body consumption by copying bytes out as they arrive and canceling the source when consumed.

nodeOpen#66030lib / srcauthor readyneeds-ci

stream: more iter streams fixes

Implemented another round of fixes for streams and iterators to improve their reliability and performance.

workerdOpen#7298

Implement proper js rpc stream cancel propagation

Implement proper JS RPC stream cancel propagation to address defects in readable stream handling.

nodeDraft#66079lib / srcneeds-ci

stream: apply more stream/iter fixes, round 3

Applied additional stream and iterator fixes to improve stability and functionality.

nodeDraft#65840lib / srcexperimentalneeds-ci

lib: implement node:logger

Implement a structured logging API with a provider model, including four built-in providers.