cloudflare/workers-sdk miniflare@4.20260401.0 on GitHub

Minor Changes

#13051 d5bffde Thanks @dario-piotrowicz! - Deprecate supportedCompatibilityDate export
The supportedCompatibilityDate export is now deprecated. Instead of relying on the workerd-derived compatibility date, callers should just use today's date directly, e.g. new Date().toISOString().slice(0, 10).
#13011 b9b7e9d Thanks @ruifigueira! - Add experimental headful browser rendering support for local development

Experimental: This feature may be removed or changed without notice.

When developing locally with the Browser Rendering API, you can enable headful (visible) mode via the X_BROWSER_HEADFUL environment variable to see the browser while debugging:
```
X_BROWSER_HEADFUL=true wrangler dev
X_BROWSER_HEADFUL=true vite dev
```
Note: when using @cloudflare/playwright, two Chrome windows may appear — the initial blank page and the one created by browser.newPage(). This is expected behavior due to how Playwright handles browser contexts via CDP.

#12992 48d83ca Thanks @RiscadoA! - Add vpc_networks binding support for routing Worker traffic through a Cloudflare Tunnel or network.

{
  "vpc_networks": [
    // Route through a specific Cloudflare Tunnel
    { "binding": "MY_FIRST_VPC", "tunnel_id": "<tunnel-id>" },
    // Route through the Cloudflare One mesh network
    { "binding": "MY_SECOND_VPC", "network_id": "cf1:network" }
  ]
}

Patch Changes

#13155 5d29055 Thanks @dependabot! - Update dependencies of "miniflare", "wrangler"
The following dependency versions have been updated:

Dependency From To

workerd 1.20260329.1 1.20260331.1
#13162 fb67a18 Thanks @dependabot! - Update dependencies of "miniflare", "wrangler"
The following dependency versions have been updated:

Dependency From To

workerd 1.20260331.1 1.20260401.1
#13238 b2f53ea Thanks @guybedford! - Fix source phase imports parsing in Miniflare
Miniflare now uses the acorn-import-phases plugin to parse import source syntax when analyzing module dependencies. This fixes ERR_MODULE_PARSE errors when running Workers that use source phase imports for WebAssembly modules in local development.