diff --git a/build-components.mjs b/build-components.mjs
index ba34594..4b0e073 100644
--- a/build-components.mjs
+++ b/build-components.mjs
@@ -100,7 +100,9 @@ export async function buildComponents({ config, compiler, plan, pkg, output, rec
     await fs.writeFile(
       shim,
       `export * from ${JSON.stringify(url)};` +
-        (name === "@quixos/camino-react" ? "" : `export {default} from ${JSON.stringify(url)};`),
+        (["@quixos/camino-react", "@quixos/camino-react/ui"].includes(name)
+          ? ""
+          : `export {default} from ${JSON.stringify(url)};`),
     );
     sharedAliases.push("--alias:" + name + "=" + shim, "--external:" + url);
   }
diff --git a/build-react-contracts.mjs b/build-react-contracts.mjs
index 0081175..ed07a9e 100644
--- a/build-react-contracts.mjs
+++ b/build-react-contracts.mjs
@@ -52,7 +52,7 @@ for (const [id, entry] of Object.entries(config.members)) {
     `import type {${entry.export} as Props} from ${typeImport};
 type Assert<T extends true> = T;
 type ObjectProps = Assert<Props extends object ? true : false>;
-type ReservedSubject = Assert<"subject" extends keyof Props ? false : true>;
+type ReservedRendererProps = Assert<Extract<keyof Props, "subject" | "usingComponent" | "provider" | "coverage" | "componentCodeFallback"> extends never ? true : false>;
 ${member.contract === "org.quixos.react.subject-only/1" ? "type SubjectOnly = Assert<{} extends Props ? true : false>;" : ""}
 export type {Props};\n`,
   );