Index: lib/Format/SortJavaScriptImports.cpp
===================================================================
--- lib/Format/SortJavaScriptImports.cpp
+++ lib/Format/SortJavaScriptImports.cpp
@@ -105,8 +105,8 @@
   // Empty URLs sort *last* (for export {...};).
   if (LHS.URL.empty() != RHS.URL.empty())
     return LHS.URL.empty() < RHS.URL.empty();
-  if (LHS.URL != RHS.URL)
-    return LHS.URL < RHS.URL;
+  if (int Res = LHS.URL.compare_lower(RHS.URL))
+    return Res < 0;
   // '*' imports (with prefix) sort before {a, b, ...} imports.
   if (LHS.Prefix.empty() != RHS.Prefix.empty())
     return LHS.Prefix.empty() < RHS.Prefix.empty();
@@ -245,7 +245,8 @@
     std::stable_sort(
         Symbols.begin(), Symbols.end(),
         [&](const JsImportedSymbol &LHS, const JsImportedSymbol &RHS) {
-          return LHS.Symbol < RHS.Symbol;
+          int Res = LHS.Symbol.compare_lower(RHS.Symbol);
+          return Res < 0;
         });
     if (Symbols == Reference.Symbols) {
       // No change in symbol order.
Index: unittests/Format/SortImportsTestJS.cpp
===================================================================
--- unittests/Format/SortImportsTestJS.cpp
+++ unittests/Format/SortImportsTestJS.cpp
@@ -236,6 +236,27 @@
              "1;");
 }
 
+TEST_F(SortImportsTestJS, SortCaseInsensitive) {
+  verifySort("import {A} from 'aa';\n"
+             "import {A} from 'Ab';\n"
+             "import {A} from 'b';\n"
+             "import {A} from 'Bc';\n"
+             "\n"
+             "1;",
+             "import {A} from 'b';\n"
+             "import {A} from 'Bc';\n"
+             "import {A} from 'Ab';\n"
+             "import {A} from 'aa';\n"
+             "\n"
+             "1;");
+  verifySort("import {aa, Ab, b, Bc} from 'x';\n"
+             "\n"
+             "1;",
+             "import {b, Bc, Ab, aa} from 'x';\n"
+             "\n"
+             "1;");
+}
+
 } // end namespace
 } // end namespace format
 } // end namespace clang