cloudflare/workers-sdk miniflare@4.20260424.0

on GitHub

Minor Changes

• #13234 7fc50c1 Thanks @natewong1313! - Support serving videos locally, add publicUrl option for stable stream preview URLs, and add caption upload support via ReadableStream

  Videos uploaded while in local mode are now served at /cdn-cgi/mf/stream/<video-id>/watch. The preview field in StreamVideo is now directly fetchable during development.

  A new publicUrl option on MiniflareOptions allows callers (e.g. Wrangler, the Vite plugin) to advertise a stable, externally-reachable URL for the Miniflare instance. When set, Stream preview URLs use this value instead of the runtime entry URL, so they remain valid across runtime restarts and port changes. The same value is also exposed as a mutable miniflare.publicUrl property.

  The helper functions buildPublicUrl and getLocallyAccessibleHost are now exported from miniflare, enabling consumers to construct client-reachable URLs that correctly handle IPv6 addresses (bracketing) and wildcard listen addresses (0.0.0.0, ::, * → 127.0.0.1).

  Caption uploads via ReadableStream are now supported in local mode. They no longer throw a "not supported in local mode" error.

Patch Changes

• #13633 3494842 Thanks @dependabot! - Update dependencies of "miniflare", "wrangler"

  The following dependency versions have been updated:

  Dependency	From	To
  workerd	1.20260421.1	1.20260422.1

• #13645 7d728fb Thanks @dependabot! - Update dependencies of "miniflare", "wrangler"

  The following dependency versions have been updated:

  Dependency	From	To
  workerd	1.20260422.1	1.20260423.1

• #13657 df9319d Thanks @dependabot! - Update dependencies of "miniflare", "wrangler"

  The following dependency versions have been updated:

  Dependency	From	To
  workerd	1.20260423.1	1.20260424.1

• #13659 3ceeec3 Thanks @petebacondarwin! - Make the dev registry watcher reliable on Windows

  The filesystem-based dev registry used chokidar with default settings, which on Windows backs onto fs.watch (ReadDirectoryChangesW). That API is known to drop or delay create events for files added shortly after the watcher attaches, which is especially common under CI virtualization. When this happened, a process that had attached its watcher before another process registered its worker would never be notified of the new entry until the next 30-second heartbeat — long enough to time out cross-process service-binding calls.

  Switch to chokidar's polling mode on Windows so the dev registry observes cross-process worker registrations reliably. The registry directory is small and a 100ms poll interval has negligible cost. Non-Windows platforms continue to use the more efficient native filesystem-event backend.

• #13560 7567ef7 Thanks @vaishnav-mk! - Preserve NonRetryableError message and name when the workflows_preserve_non_retryable_error_message compatibility flag is enabled, instead of replacing it with a generic error message.

• #13644 377715d Thanks @MattieTK! - Update @clack/core and @clack/prompts to v1.2.0

  Bumps the bundled @clack/core dependency used internally by @cloudflare/cli from 0.3.x to 1.2.0, and the @clack/prompts dependency in create-cloudflare from 0.6.x to 1.2.0. Clack v1 includes a number of API changes, but no user-facing prompt behaviour changes are expected.