cloudflare/containers v0.3.4

v0.3.4

Repository: cloudflare/containers

Tag: v0.3.4

Published: 2026-05-11T20:37:37Z

Prerelease: no

Release notes:

Patch Changes

• 8442f40: Fix a race in Container where concurrent container.fetch calls to a cold container could throw "start() cannot be called on a container that is already running.".

• cf01432: Ensure pending stop events are processed when the persisted container lifecycle state is still running but the underlying container has already exited.

Migrate the root unit test suite from Jest to Vitest and add a test:unit script for running src/tests directly.

• cf41295: Fix subclass sleepAfter overrides being ignored during the initial activity timeout setup. Previously, the base Container constructor called renewActivityTimeout() inside blockConcurrencyWhile() before subclass class-field initializers ran, so the first sleepAfterMs was always computed from the base default ('10m') regardless of whether the subclass declared sleepAfter = '2h'. A container could then be killed by the activity timeout before the subclass's longer window took effect on the next renewActivityTimeout call. Declarations like:

class BigContainer extends Container {
sleepAfter = '2h';
}

are now honored from the very first alarm check.

• 07fedbb: Preserve Cloudchamber startup rate-limit errors in the Containers helper and return HTTP 429 from containerFetch() when startup is rate limited.