diff --git a/packages/core/package.json b/packages/core/package.json
index 300251328..fe07d3849 100644
--- a/packages/core/package.json
+++ b/packages/core/package.json
@@ -31,8 +31,8 @@
     },
     "./runtime": "./dist/hyperframe.runtime.iife.js",
     "./runtime/lottie-readiness": {
-      "import": "./src/runtime/adapters/lottieReadiness.ts",
-      "types": "./src/runtime/adapters/lottieReadiness.ts"
+      "import": "./src/lottieReadiness.ts",
+      "types": "./src/lottieReadiness.ts"
     },
     "./studio-api": {
       "import": "./src/studio-api/index.ts",
@@ -78,8 +78,8 @@
       },
       "./runtime": "./dist/hyperframe.runtime.iife.js",
       "./runtime/lottie-readiness": {
-        "import": "./dist/runtime/adapters/lottieReadiness.js",
-        "types": "./dist/runtime/adapters/lottieReadiness.d.ts"
+        "import": "./dist/lottieReadiness.js",
+        "types": "./dist/lottieReadiness.d.ts"
       },
       "./studio-api": {
         "import": "./dist/studio-api/index.js",
diff --git a/packages/core/src/runtime/adapters/lottieReadiness.test.ts b/packages/core/src/lottieReadiness.test.ts
similarity index 100%
rename from packages/core/src/runtime/adapters/lottieReadiness.test.ts
rename to packages/core/src/lottieReadiness.test.ts
diff --git a/packages/core/src/runtime/adapters/lottieReadiness.ts b/packages/core/src/lottieReadiness.ts
similarity index 100%
rename from packages/core/src/runtime/adapters/lottieReadiness.ts
rename to packages/core/src/lottieReadiness.ts
diff --git a/packages/core/src/runtime/adapters/lottie.ts b/packages/core/src/runtime/adapters/lottie.ts
index 74da88a16..88dc35c52 100644
--- a/packages/core/src/runtime/adapters/lottie.ts
+++ b/packages/core/src/runtime/adapters/lottie.ts
@@ -1,6 +1,6 @@
 import type { RuntimeDeterministicAdapter } from "../types";
 import { swallow } from "../diagnostics";
-export { isLottieAnimationLoaded } from "./lottieReadiness";
+export { isLottieAnimationLoaded } from "../../lottieReadiness";
 
 /**
  * Lottie adapter for HyperFrames
diff --git a/packages/studio/src/components/editor/manualEditingAvailability.ts b/packages/studio/src/components/editor/manualEditingAvailability.ts
index 5fd276639..345ca8f41 100644
--- a/packages/studio/src/components/editor/manualEditingAvailability.ts
+++ b/packages/studio/src/components/editor/manualEditingAvailability.ts
@@ -27,7 +27,12 @@ export function resolveStudioBooleanEnvFlag(
   return fallback;
 }
 
-const env = import.meta.env as StudioFeatureFlagEnv;
+// `import.meta.env` is a Vite-only extension. In non-Vite ESM hosts
+// (Next.js / Turbopack, Node, jest in some configs) it's undefined,
+// and downstream `env[name]` reads would crash. Fall back to `{}` so
+// every flag resolves to its declared default outside Vite. Direct
+// property access keeps Vite's compile-time transform happy.
+const env = (import.meta.env ?? {}) as StudioFeatureFlagEnv;
 
 export const STUDIO_PREVIEW_MANUAL_EDITING_ENABLED = resolveStudioBooleanEnvFlag(
   env,