fix: export should not be erased when mixed with `proposal-export-def…

…ault-from`

packages/babel-plugin-transform-typescript/src/index.js

@@ -101,7 +101,7 @@ export default declare(
             !path.node.source &&
             path.node.specifiers.length > 0 &&
             !path.node.specifiers.find(exportSpecifier =>
-              path.scope.hasOwnBinding(exportSpecifier.local.name),
+              path.scope.hasBinding(exportSpecifier.local.name),
             )
           ) {
             path.remove();
@@ -112,7 +112,7 @@ export default declare(
           // remove type exports
           if (
             !path.parent.source &&
-            !path.scope.hasOwnBinding(path.node.local.name)
+            !path.scope.hasBinding(path.node.local.name)
           ) {
             path.remove();
           }
@@ -122,7 +122,7 @@ export default declare(
           // remove whole declaration if it's exporting a TS type
           if (
             t.isIdentifier(path.node.declaration) &&
-            !path.scope.hasOwnBinding(path.node.declaration.name)
+            !path.scope.hasBinding(path.node.declaration.name)
           ) {
             path.remove();
           }

packages/babel-plugin-transform-typescript/test/fixtures/exports/export-default-from/input.mjs

@@ -0,0 +1 @@
+export foo from "./foo";

packages/babel-plugin-transform-typescript/test/fixtures/exports/export-default-from/options.json

@@ -0,0 +1,3 @@
+{
+  "plugins": ["proposal-export-default-from", ["transform-typescript", { "allowNamespaces": true }]]
+}

packages/babel-plugin-transform-typescript/test/fixtures/exports/export-default-from/output.mjs

@@ -0,0 +1,2 @@
+import _foo from "./foo";
+export { _foo as foo };