fix: do not remove type import used in TS import= (#14913)

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

* tweak typing

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:

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;

packages/babel-plugin-transform-typescript/test/fixtures/imports/elide-type-referenced-in-imports-equal-no/options.json

@@ -0,0 +1,3 @@
+{
+  "plugins": ["transform-typescript"]
+}

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;