fix using imported values from .stylex.js files in stylex.props

Author: nmn

packages/@stylexjs/babel-plugin/src/utils/evaluate-path.js

@@ -201,6 +201,9 @@ function evaluateThemeRef(
     {},
     {
       get(_, key: string) {
+        if (key === '__IS_PROXY') {
+          return true;
+        }
         return resolveKey(key);
       },
       set(_, key: string, value: string) {

packages/@stylexjs/babel-plugin/src/visitors/stylex-props.js

@@ -217,7 +217,11 @@ export default function transformStylexProps(
             state,
             evaluatePathFnConfig,
           );
-          if (!confident || styleValue == null) {
+          if (
+            !confident ||
+            styleValue == null ||
+            styleValue.__IS_PROXY === true
+          ) {
             nonNullProps = true;
             styleNonNullProps = true;
           } else {
@@ -357,6 +361,9 @@ function parseNullableStyle(
     parsedObj.value != null &&
     typeof parsedObj.value === 'object'
   ) {
+    if (parsedObj.value.__IS_PROXY === true) {
+      return 'other';
+    }
     return parsedObj.value;
   }