From 4b3f619d4ad3585e3e2d1f2c15230475cc18b68b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Hu=C3=A1ng=20J=C3=B9nli=C3=A0ng?= <jlhwung@gmail.com>
Date: Tue, 6 Sep 2022 17:12:04 -0400
Subject: [PATCH] fix: do not remove type import used in TS import= (#14913)

* fix: do not remove type import used in TS import=

* tweak typing
---
 .../babel-plugin-transform-typescript/src/index.ts     | 10 ++++++++--
 .../elide-type-referenced-in-imports-equal-no/input.ts |  5 +++++
 .../options.json                                       |  3 +++
 .../output.mjs                                         |  4 ++++
 4 files changed, 20 insertions(+), 2 deletions(-)
 create mode 100644 packages/babel-plugin-transform-typescript/test/fixtures/imports/elide-type-referenced-in-imports-equal-no/input.ts
 create mode 100644 packages/babel-plugin-transform-typescript/test/fixtures/imports/elide-type-referenced-in-imports-equal-no/options.json
 create mode 100644 packages/babel-plugin-transform-typescript/test/fixtures/imports/elide-type-referenced-in-imports-equal-no/output.mjs

diff --git a/packages/babel-plugin-transform-typescript/src/index.ts b/packages/babel-plugin-transform-typescript/src/index.ts
index 1696f8e9f780..3662ad8252c0 100644
--- a/packages/babel-plugin-transform-typescript/src/index.ts
+++ b/packages/babel-plugin-transform-typescript/src/index.ts
@@ -13,13 +13,19 @@ import transpileNamespace from "./namespace";
 function isInType(path: NodePath) {
   switch (path.parent.type) {
     case "TSTypeReference":
-    case "TSQualifiedName":
     case "TSExpressionWithTypeArguments":
     case "TSTypeQuery":
       return true;
+    case "TSQualifiedName":
+      return (
+        // `import foo = ns.bar` is transformed to `var foo = ns.bar` and should not be removed
+        path.parentPath.findParent(path => path.type !== "TSQualifiedName")
+          .type !== "TSImportEqualsDeclaration"
+      );
     case "ExportSpecifier":
       return (
-        (path.parentPath.parent as t.ExportNamedDeclaration).exportKind ===
+        // @ts-expect-error: DeclareExportDeclaration does not have `exportKind`
+        (path.parentPath as NodePath<t.ExportSpecifier>).parent.exportKind ===
         "type"
       );
     default:
diff --git a/packages/babel-plugin-transform-typescript/test/fixtures/imports/elide-type-referenced-in-imports-equal-no/input.ts b/packages/babel-plugin-transform-typescript/test/fixtures/imports/elide-type-referenced-in-imports-equal-no/input.ts
new file mode 100644
index 000000000000..f4da1ee0208d
--- /dev/null
+++ b/packages/babel-plugin-transform-typescript/test/fixtures/imports/elide-type-referenced-in-imports-equal-no/input.ts
@@ -0,0 +1,5 @@
+import nsa from "./module-a";
+import foo = nsa.bar;
+
+import nsb from "./module-b";
+import bar = nsb.foo.bar;
diff --git a/packages/babel-plugin-transform-typescript/test/fixtures/imports/elide-type-referenced-in-imports-equal-no/options.json b/packages/babel-plugin-transform-typescript/test/fixtures/imports/elide-type-referenced-in-imports-equal-no/options.json
new file mode 100644
index 000000000000..5c79172a6082
--- /dev/null
+++ b/packages/babel-plugin-transform-typescript/test/fixtures/imports/elide-type-referenced-in-imports-equal-no/options.json
@@ -0,0 +1,3 @@
+{
+  "plugins": ["transform-typescript"]
+}
diff --git a/packages/babel-plugin-transform-typescript/test/fixtures/imports/elide-type-referenced-in-imports-equal-no/output.mjs b/packages/babel-plugin-transform-typescript/test/fixtures/imports/elide-type-referenced-in-imports-equal-no/output.mjs
new file mode 100644
index 000000000000..b47cdaf84293
--- /dev/null
+++ b/packages/babel-plugin-transform-typescript/test/fixtures/imports/elide-type-referenced-in-imports-equal-no/output.mjs
@@ -0,0 +1,4 @@
+import nsa from "./module-a";
+var foo = nsa.bar;
+import nsb from "./module-b";
+var bar = nsb.foo.bar;