Change8

Cloudflare Workers

Backend & Infra

⛅️ Home to Wrangler, the CLI for Cloudflare Workers®

Latest: @cloudflare/runtime-types@0.0.1925 releases2 breaking changes4 common errorsView on GitHub

Release History

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@cloudflare/runtime-types@0.0.19
Aug 28, 2026

This patch release updates dependencies, specifically Miniflare to version 5.20260828.0-alpha.

@cloudflare/vite-plugin@1.54.2
Aug 28, 2026

This patch release updates dependencies for Miniflare and Wrangler. Specific commit hashes are provided for detailed changes.

@cloudflare/pages-shared@0.13.174
Aug 28, 2026

This patch release updates dependencies, including Miniflare to version 5.20260828.0-alpha.

@cloudflare/autoconfig@0.4.01 fix
Aug 28, 2026

Resolved canonical framework build commands for the `cf` target by having autoconfig return framework commands instead of package scripts. This change delegates build selection to `cf deploy` for generated deploy scripts.

miniflare@5.20260828.0-alpha1 fix4 features
Aug 28, 2026

This release enhances local development with new features for email handling and image uploads/delivery. It also includes a renaming of worker target fields for consistency and dependency updates.

@cloudflare/local-explorer-ui@0.15.02 features
Aug 28, 2026

Introduced email inspection and testing capabilities to the Local Explorer, allowing developers to view and simulate email interactions with their Workers during local development.

@cloudflare/build-output-utils@0.3.1
Aug 28, 2026

This patch release updates dependencies, specifically @cloudflare/config to version 0.9.0. The change is linked to a specific commit for reference.

@cloudflare/vitest-plugin@1.1.21 fix
Aug 28, 2026

This patch release fixes a bug causing slowdowns and crashes in tests involving repeated Durable Object creation. It also updates dependencies for Miniflare and Wrangler.

@cloudflare/remote-bindings@0.0.17
Aug 28, 2026

This patch updates dependencies for Miniflare and deploy-helpers. No functional changes are described.

@cloudflare/config@0.9.0Breaking
Aug 28, 2026

Renamed Worker target fields from `workerName` to `worker` in `@cloudflare/config` and Miniflare configuration APIs for consistency across various target types.

@cloudflare/deploy-helpers@0.9.2
Aug 28, 2026

This patch release updates dependencies, specifically for Miniflare to version 5.20260828.0-alpha.

wrangler@4.127.1
Aug 28, 2026

Updated dependencies for miniflare and wrangler, including @cloudflare/workers-types and workerd. This patch release focuses on dependency version updates.

miniflare@5.20260826.0-alpha
Aug 27, 2026

Updated dependencies for 'miniflare' and 'wrangler', specifically '@cloudflare/workers-types' and 'workerd'.

@cloudflare/deploy-helpers@0.9.11 fix
Aug 27, 2026

The `wrangler preview` command has been updated to use multipart form data for module uploads, resolving deployment size limit issues. This change improves the reliability of preview deployments, especially for Workers with large sourcemaps.

@cloudflare/vite-plugin@1.54.1
Aug 27, 2026

This patch release updates dependencies for Miniflare and Wrangler. Specific version updates are provided for each package.

@cloudflare/remote-bindings@0.0.16
Aug 27, 2026

This patch release updates dependencies for Miniflare and @cloudflare/deploy-helpers.

wrangler@4.127.01 fix1 feature
Aug 27, 2026

Introduces per-workflow concurrency limits for enhanced control over Workflow execution and improves `wrangler preview` module uploading to prevent deployment failures.

@cloudflare/pages-shared@0.13.173
Aug 27, 2026

This patch updates dependencies, specifically Miniflare to version 5.20260826.0-alpha. This change is linked to a specific commit in the Cloudflare Workers SDK repository.

@cloudflare/runtime-types@0.0.18
Aug 27, 2026

This patch updates the miniflare dependency to version 5.20260826.0-alpha.

@cloudflare/vitest-plugin@1.1.1
Aug 27, 2026

Updated dependencies for Miniflare and Wrangler.

@cloudflare/build-output-utils@0.3.01 feature
Aug 27, 2026

Added support for multiple named Workers in Build Output utilities, allowing for more flexible targeting and reading of Worker configurations. The `writeWorkerConfig` function has been updated to accept a single options object.

@cloudflare/workers-auth@0.6.61 fix
Aug 25, 2026

Fixed an issue where `wrangler login --use-keyring` would incorrectly report `secret-tool` as missing on Linux. The fix ensures `secret-tool` is only reported as missing when its execution truly fails.

@cloudflare/autoconfig@0.3.01 feature
Aug 25, 2026

Introduced support for multiple configuration targets in autoconfig, enhancing flexibility for setup and deployment. Dependencies have also been updated.

@cloudflare/build-output-utils@0.2.01 feature
Aug 25, 2026

The build output specification now includes the build mode in `config.json`. Function names related to root configuration have been updated for clarity.

miniflare@5.20260825.0-alphaBreaking8 features
Aug 25, 2026

This release enhances local development with improved email handling, experimental shared local storage, and FUSE-capable container development. It also consolidates development-only binding configurations and removes unsupported remote configurations for Workflow bindings.

Common Errors

MiniflareCoreError4 reports

MiniflareCoreError often arises from conflicting or improperly configured bindings, especially when using browser bindings or multiple workers in the same environment. Ensure all bindings are correctly defined in your wrangler.toml or CLI arguments and that there are no conflicting binding types (e.g., attempting to use browser bindings with module workers simultaneously). If using multiple workers, verify each worker has unique binding names to avoid overlapping modules. Finally, double-check that the referenced modules in your bindings are correctly present and resolvable in your project.

SyntaxError2 reports

This SyntaxError in Cloudflare Workers often arises from attempting to parse gzipped response bodies as JSON without decompressing them first. To fix this, ensure any gzipped responses are properly decompressed using a library like `zlib` or a fetch implementation that handles content encoding automatically before parsing them with `JSON.parse`.

InferenceUpstreamError1 report

The "InferenceUpstreamError" in Cloudflare Workers AI usually indicates a problem with the model being unavailable or timing out when accessed by the Workers AI inference server. Ensure the model ID is correct, the model is properly deployed and active on the Cloudflare AI platform, and that the Worker's request doesn't exceed any limits (memory, CPU time). Double-check Cloudflare status pages for service outages affecting Workers AI, and consider implementing retry logic with exponential backoff in your worker to gracefully handle temporary upstream issues; also consider downgrading wrangler to version 4.35.0 to mitigate any recent breaking changes.

DataCloneError1 report

The DataCloneError in Cloudflare Workers usually arises when attempting to pass non-cloneable objects (like functions, class instances with methods, or certain DOM nodes) across the Worker's boundaries via message passing or durable objects. To fix this, ensure you only send plain JavaScript objects and primitive data types between Workers. If you need to transfer complex data, serialize it into a JSON string before sending, and then deserialize it on the receiving end, or redesign your code to avoid sending such data in the first place.

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