feat(server): add exports for custom handler and adapter support

Expose internal handler types and adapter interfaces. Improve visibility of
handler internals required for overrides. Add shared entry point for common
server utilities.

Author: mwillbanks

packages/server/package.json

@@ -39,6 +39,16 @@
                 "default": "./dist/api.cjs"
             }
         },
+        "./common": {
+            "import": {
+                "types": "./dist/common.d.ts",
+                "default": "./dist/common.js"
+            },
+            "require": {
+                "types": "./dist/common.d.cts",
+                "default": "./dist/common.cjs"
+            }
+        },
         "./express": {
             "import": {
                 "types": "./dist/express.d.ts",
@@ -118,6 +128,16 @@
                 "types": "./dist/tanstack-start.d.cts",
                 "default": "./dist/tanstack-start.cjs"
             }
+        },
+        "./types": {
+            "import": {
+                "types": "./dist/types.d.ts",
+                "default": "./dist/types.js"
+            },
+            "require": {
+                "types": "./dist/types.d.cts",
+                "default": "./dist/types.cjs"
+            }
         }
     },
     "dependencies": {

packages/server/src/api/index.ts

@@ -1,2 +1,3 @@
 export { RestApiHandler, type RestApiHandlerOptions } from './rest';
 export { RPCApiHandler, type RPCApiHandlerOptions } from './rpc';
+export * from './utils';