Fix DocumentRenderer usage in server components (#1424)

Author: emmatown

Diff for: .changeset/two-colts-confess.md

@@ -0,0 +1,5 @@
+---
+'@keystatic/core': patch
+---
+
+Fix `DocumentRenderer` usage in server components

Diff for: packages/keystatic/package.json

@@ -280,6 +280,9 @@
     },
     "#markdoc": "./src/markdoc.js",
     "#base64": "./src/base64.ts",
-    "#react-compiler-runtime": "./src/react-compiler-runtime.ts"
+    "#react-compiler-runtime": {
+      "react-server": "./src/react-compiler-runtime-react-server.ts",
+      "default": "./src/react-compiler-runtime.ts"
+    }
   }
 }

Diff for: packages/keystatic/src/react-compiler-runtime-react-server.ts

@@ -0,0 +1,11 @@
+const $empty = Symbol.for('react.memo_cache_sentinel');
+
+export function c(size: number) {
+  const $ = new Array(size);
+  for (let ii = 0; ii < size; ii++) {
+    $[ii] = $empty;
+  }
+  // @ts-ignore
+  $[$empty] = true;
+  return $;
+}