From d60f2ecd1528b279b97a40b37c6c6a5e114bf9a3 Mon Sep 17 00:00:00 2001
From: liuxingbaoyu <30521560+liuxingbaoyu@users.noreply.github.com>
Date: Mon, 19 Sep 2022 18:44:26 +0800
Subject: [PATCH] fix

---
 .../src/namespace.ts                          | 21 ++++++++-----------
 .../test/fixtures/namespace/declare/input.ts  |  5 ++++-
 2 files changed, 13 insertions(+), 13 deletions(-)

diff --git a/packages/babel-plugin-transform-typescript/src/namespace.ts b/packages/babel-plugin-transform-typescript/src/namespace.ts
index a181cdca7448..8c2980452839 100644
--- a/packages/babel-plugin-transform-typescript/src/namespace.ts
+++ b/packages/babel-plugin-transform-typescript/src/namespace.ts
@@ -81,14 +81,11 @@ function handleVariableDeclaration(
     // `export const a = 1` transforms to `const a = N.a = 1`, the output
     // is smaller than `const a = 1; N.a = a`;
     for (const declarator of declarations) {
-      // `export declare const a`,the declarator.init would be null,
-      if (declarator.init) {
-        declarator.init = t.assignmentExpression(
-          "=",
-          getMemberExpression(name, declarator.id.name),
-          declarator.init,
-        );
-      }
+      declarator.init = t.assignmentExpression(
+        "=",
+        getMemberExpression(name, declarator.id.name),
+        declarator.init,
+      );
     }
     return [node];
   }
@@ -183,15 +180,15 @@ function handleNested(
       // Export declarations get parsed using the next switch.
     }
 
+    if ("declare" in subNode.declaration && subNode.declaration.declare) {
+      continue;
+    }
+
     // Transform the export declarations that occur inside of a namespace.
     switch (subNode.declaration.type) {
       case "TSEnumDeclaration":
       case "FunctionDeclaration":
       case "ClassDeclaration": {
-        if (subNode.declaration.declare) {
-          continue;
-        }
-
         const itemName = subNode.declaration.id.name;
         names.add(itemName);
         namespaceTopLevel.splice(
diff --git a/packages/babel-plugin-transform-typescript/test/fixtures/namespace/declare/input.ts b/packages/babel-plugin-transform-typescript/test/fixtures/namespace/declare/input.ts
index 8850f9ac5929..e82800b1ef83 100644
--- a/packages/babel-plugin-transform-typescript/test/fixtures/namespace/declare/input.ts
+++ b/packages/babel-plugin-transform-typescript/test/fixtures/namespace/declare/input.ts
@@ -4,4 +4,7 @@ export namespace N {
   export declare enum e { };
   export declare function f(): void;
   export declare const v: unknown;
-}
\ No newline at end of file
+  export declare namespace B {
+    export interface C { }
+  }
+}