Worker and MessagePort messaging gets faster (
81790b0)
Deno adds raw post-message ops and synchronous drain loops to cut serde and async round-trip overhead for the common case. This should noticeably improve worker and MessagePort throughput, especially for chatty ping-pong patterns.
Node worker_threads parentPort is isolated from globalThis (3d766d5)
parentPort is now a separate delegate object instead of an alias of the worker global, which avoids recursion and double-delivery bugs when libraries monkey-patch postMessage or mix Node-style and web-style handlers. That brings Deno closer to Node's worker semantics and fixes tricky Emscripten/z3-solver cases.
HTTP/2 compatibility fills in multiple protocol gaps
A cluster of commits tightened Deno's node:http2 behavior around headers, ALPN fallback, push streams, invalid frame limits, GOAWAY payloads, and socket lifecycle handling. These fixes unlock several compat tests and close real interoperability/security-adjacent gaps like response splitting and header validation. (
efa25f5, 79d3405, 6568c65, fb7be9c, 52a849d, 987c1e8, 79df2ac, caf98c5, 44cd971, 3818362, dcc8fb7, 3c8c5cf)
Node fs and child_process behavior gets closer to Node
fs.mkdtempDisposable*, fs.readdir encoding shorthand, child_process.spawn() stdio piping, and reusePort listen flags were all aligned with Node's behavior. The Windows writeFileSync fix is particularly important: it prevents a misleading EEXIST error and avoids data loss when truncation happens before CRT fd creation succeeds. (
98e65bc, f47b48b, bf216e0, 92661f2, a1468b2)
TLS/socket flow control and close handling are corrected
TLS readStop now truly stops delivery, buffers pending plaintext/EOF, and flushes it on the next readStart, fixing backpressure and lifecycle edge cases. There were also socket-write/shutdown fixes for HTTP/2 and X.509v1 cert acceptance updates that improve real-world TLS interop. (9e9a919, dcc8fb7, 4b78e6f, fb7be9c)
fs.Utf8Stream lands (dde034d)
Deno adds fs.Utf8Stream, a new internal stream helper needed for Node compat coverage. The implementation is large and suggests a new supported behavior surface rather than a small internal tweak.
Task filtering now matches workspace directory names (
3ed99fd)
deno task --filter now matches on workspace directory names, fixing a real usability bug for monorepos with directory-based workspace layouts. This makes task selection behave more intuitively in common workspace setups.
Coverage no longer counts injected helper code (52eb81d)
deno coverage now excludes SWC-injected decorator helpers from reported results, preventing artificial drops in coverage percentages. This is a correctness fix for reporting, not user code execution.
Import wildcard matching and bundle diagnostics improved
npm package import resolution now handles single-character wildcard segments, and Deno.bundle reports a clearer error when invoked from a compiled binary. These are useful edge-case fixes, but narrower in scope than the main runtime work. (2ea8741, 48f0300)
Other misc changes
- Node compat test enrollments/ignores and config updates across multiple HTTP/2, timers, worker, and child_process cases
- Small internal alignment fixes in
ext/nodeprocess/module, timers, HTTP server, and fetch client option handling - Bundle/CSS fragment URL handling tweak
- Dependency/Cargo lock bumps
- Minor test fixture additions and expected-output updates