Fix cloneNode with typeAnnotation.

Fixes #8996
babel · Nov 8, 2018 · 63bc497 · 63bc497
1 parent 343f776
commit 63bc497
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diff --git a/packages/babel-types/src/clone/cloneNode.js b/packages/babel-types/src/clone/cloneNode.js
@@ -66,6 +66,9 @@ export default function cloneNode<T: Object>(node: T, deep: boolean = true): T {
       ...node.extra,
     };
   }
+  if (has(node, "typeAnnotation")) {
+    newNode.typeAnnotation = node.typeAnnotation;
+  }
 
   return newNode;
 }
diff --git a/packages/babel-types/test/cloning.js b/packages/babel-types/test/cloning.js
@@ -56,4 +56,17 @@ describe("cloneNode", function() {
     expect(node.object).toBe(cloned.object);
     expect(node.property).toBe(cloned.property);
   });
+
+  it("should preserve type annotations", function() {
+    const node = t.variableDeclaration("let", [
+      t.variableDeclarator({
+        ...t.identifier("value"),
+        typeAnnotation: t.anyTypeAnnotation(),
+      }),
+    ]);
+    const cloned = t.cloneNode(node, /* deep */ true);
+    expect(cloned.declarations[0].id.typeAnnotation).toBe(
+      node.declarations[0].id.typeAnnotation,
+    );
+  });
 });