fix: not handling export default value

Author: samualtnorman

src/bundle-generator.ts

@@ -470,6 +470,12 @@ function updateResultForRootSourceFile(params: UpdateParams, result: CollectingR
 	for (const statement of params.statements) {
 		// "export default" or "export ="
 		const isExportAssignment = ts.isExportAssignment(statement);
+
+		if (isExportAssignment && !statement.isExportEquals && ts.isIdentifier(statement.expression)) {
+			result.renamedExports.push(`${statement.expression.getText()} as default`);
+			continue;
+		}
+
 		const isReExportFromImportable = isReExportFromImportableModule(statement);
 
 		if (isExportAssignment || isReExportFromImportable) {