diff --git a/clang/lib/Format/SortJavaScriptImports.cpp b/clang/lib/Format/SortJavaScriptImports.cpp
--- a/clang/lib/Format/SortJavaScriptImports.cpp
+++ b/clang/lib/Format/SortJavaScriptImports.cpp
@@ -271,6 +271,7 @@
       //   import Default from 'foo'; on either previous or this.
       //   mismatching
       if (Reference->Category == JsModuleReference::SIDE_EFFECT ||
+          PreviousReference->Category == JsModuleReference::SIDE_EFFECT ||
           Reference->IsExport != PreviousReference->IsExport ||
           !PreviousReference->Prefix.empty() || !Reference->Prefix.empty() ||
           !PreviousReference->DefaultImport.empty() ||
diff --git a/clang/unittests/Format/SortImportsTestJS.cpp b/clang/unittests/Format/SortImportsTestJS.cpp
--- a/clang/unittests/Format/SortImportsTestJS.cpp
+++ b/clang/unittests/Format/SortImportsTestJS.cpp
@@ -364,6 +364,13 @@
   // do merge exports
   verifySort("export {A, B} from 'foo';\n", "export {A} from 'foo';\n"
                                             "export   {B} from 'foo';");
+
+  // do not merge side effect imports with named ones
+  verifySort("import './a';\n"
+             "\n"
+             "import {bar} from './a';\n",
+             "import {bar} from './a';\n"
+             "import './a';\n");
 }
 
 } // end namespace