[miniflare] Fix mixed pipelines records

[petebacondarwin]

Fixes the same schema validation bug as was fixed for r2Buckets, kvNamespaces, and d1Databases — pipelines bindings could not mix plain string values and object values in the same record.

Previously, passing a config like:

new Miniflare({
  pipelines: {
    LOCAL_PIPELINE: "local-pipeline",
    REMOTE_PIPELINE: { pipeline: "remote-pipeline", remoteProxyConnectionString: ... },
  },
})

would throw a Zod validation error because the schema used two separate z.record(...) union branches — one accepting only strings, one accepting only objects. Zod would fail both branches when the values were mixed.

The fix collapses the two z.record(...) branches into a single z.record(z.union([z.string(), z.object({...})])), matching the pattern already applied to r2Buckets. The bindingEntries() local helper already handled mixed values correctly at runtime (typeof opts === "string") — only the schema validation was too restrictive. The helper's TypeScript parameter type has also been updated to reflect the new union.

---

• Tests
  • Tests included/updated
  • Automated tests not possible - manual testing has been completed as follows:
  • Additional testing not necessary because:
• Public documentation
  • Cloudflare docs PR(s):
  • Documentation not necessary because: this is a bug fix for an internal schema validation constraint; no public API surface changed

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---

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Latest commit: 492538a

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commit: 492538a