Generate types for all bindings across all environments

.changeset/tall-hairs-send.md

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+---
+"wrangler": minor
+---
+
+`wrangler types` now generates per-environment TypeScript interfaces when named environments exist in your configuration.
+
+When your configuration has named environments (an `env` object), `wrangler types` now generates both:
+
+- **Per-environment interfaces** (e.g., `StagingEnv`, `ProductionEnv`) containing only the bindings explicitly declared in each environment, plus inherited secrets
+- **An aggregated `Env` interface** with all bindings from all environments (top-level + named environments), where:
+  - Bindings present in **all** environments are required
+  - Bindings not present in all environments are optional
+  - Secrets are always required (since they're inherited everywhere)
+  - Conflicting binding types across environments produce union types (e.g., `KVNamespace | R2Bucket`)
+
+However, if your config does not contain any environments, or you manually specify an environment via `--env`, `wrangler types` will continue to generate a single interface as before.