1 files changed, 18 insertions, 3 deletions
diff --git a/node_modules/@babel/template/lib/populate.js b/node_modules/@babel/template/lib/populate.js
index fb67269f..35e5f6f7 100644
--- a/node_modules/@babel/template/lib/populate.js
+++ b/node_modules/@babel/template/lib/populate.js
@@ -98,9 +98,24 @@ function applyReplacement(placeholder, ast, replacement) {
       throw new Error("Cannot replace single expression with an array.");
     }
   }
+  function set(parent, key, value) {
+    const node = parent[key];
+    parent[key] = value;
+    if (node.type === "Identifier") {
+      if (node.typeAnnotation) {
+        value.typeAnnotation = node.typeAnnotation;
+      }
+      if (node.optional) {
+        value.optional = node.optional;
+      }
+      if (node.decorators) {
+        value.decorators = node.decorators;
+      }
+    }
+  }
   if (index === undefined) {
     validate(parent, key, replacement);
-    parent[key] = replacement;
+    set(parent, key, replacement);
   } else {
     const items = parent[key].slice();
     if (placeholder.type === "statement" || placeholder.type === "param") {
@@ -109,10 +124,10 @@ function applyReplacement(placeholder, ast, replacement) {
       } else if (Array.isArray(replacement)) {
         items.splice(index, 1, ...replacement);
       } else {
-        items[index] = replacement;
+        set(items, index, replacement);
       }
     } else {
-      items[index] = replacement;
+      set(items, index, replacement);
     }
     validate(parent, key, items);
     parent[key] = items;