experimental: embed edge config during build

[dferber90]

This is an experimental version of @vercel/edge-config that embeds the Edge Configs at build time.

For this experimental version to work, you'll need to run pnpm edge-config before your application builds. This is only necessary for the experimental version and will download all connected edge configs to /tmp/edge-config.

The SDK will then try to read any Edge Config from that folder at build time so it will consistently use the same, local version.

The package uses /* webpackIgnore: true */ when importing the local edge configs using dynamic imports to prevent bundling them, as the bundle might otherwise exceed the Edge Functions size limits.

Complexifiers

• preloading: embedded vs layered edge config
• HEAD vs GET (has() vs get())
• full config cache vs item cache
• streaming vs non-streaming
• ts header vs no header
• background refresh
• etag http cache

Optimizations

• avoid reading keys we know don't exist
• reuse knowledge from has() for get() and vice versa
• stream only needs to send edge config if it wasn't preloaded (once we use streaming in prod)

[changeset-bot]

🦋 Changeset detected

Latest commit: 08a945b

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages

Name	Type
@vercel/edge-config	Minor
vercel-storage-integration-test-suite	Patch

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[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Preview	Updated (UTC)
vercel-storage-next-integration-test-suite	Ready	Preview	Sep 29, 2025 9:12am

[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	@​vercel/​functions@​2.2.5
	eventsource-client@​1.2.0

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