npm / workerd
workerd
What changed in workerd 1, from its official release notes, upgrade guides and advisories. Sources checked 2026-10-18.
1 new APIs and options3 behavior and defaults6 fixes and other
See which of these apply to your code, ranked, in your agent:
npx @unstale/cli initworkerd 110 changes
New APIs and options 1
The retry policy can be set per Durable Object stub.
Behavior and default changes 3
Actor RPC exceptions are held behind the actor's output gate.
Pull is deferred to a batch's last chunk on the auto-allocate path.
Pyodide's compiled Wasm module is kept alive across isolates.
Fixes and other changes 6
A byte source's expectedLength is treated as an exact total.
A transient marker is added for Durable Object call failures.
A queued ReadableStream's source is released once its algorithms clear.
Stream constructors now read source, sink, and transformer members according to pinned behavior.
Exceptions in actors are reported for the right request.
EOF bookkeeping now accounts for pumped bytes in RPC streams.