Index: lib/Format/UnwrappedLineParser.h
===================================================================
--- lib/Format/UnwrappedLineParser.h
+++ lib/Format/UnwrappedLineParser.h
@@ -125,6 +125,7 @@
   void nextToken();
   const FormatToken *getPreviousToken();
   void readToken();
+  bool isIIFE() const;
 
   // Decides which comment tokens should be added to the current line and which
   // should be added as comments before the next token.
Index: lib/Format/UnwrappedLineParser.cpp
===================================================================
--- lib/Format/UnwrappedLineParser.cpp
+++ lib/Format/UnwrappedLineParser.cpp
@@ -493,15 +493,16 @@
   FormatTok->BlockKind = BK_Block;
   nextToken();
   {
-    bool GoogScope =
-        Style.Language == FormatStyle::LK_JavaScript && isGoogScope(*Line);
+    bool SkipIndent =
+        Style.Language == FormatStyle::LK_JavaScript &&
+        (isGoogScope(*Line) || isIIFE());
     ScopedLineState LineState(*this);
     ScopedDeclarationState DeclarationState(*Line, DeclarationScopeStack,
                                             /*MustBeDeclaration=*/false);
-    Line->Level += GoogScope ? 0 : 1;
+    Line->Level += SkipIndent ? 0 : 1;
     parseLevel(/*HasOpeningBrace=*/true);
     flushComments(isOnNewLine(*FormatTok));
-    Line->Level -= GoogScope ? 0 : 1;
+    Line->Level -= SkipIndent ? 0 : 1;
   }
   nextToken();
 }
@@ -2342,5 +2343,30 @@
   }
 }
 
+bool UnwrappedLineParser::isIIFE() const {
+  // Look for the start of an immediately invoked anonymous function.
+  // https://en.wikipedia.org/wiki/Immediately-invoked_function_expression
+  // This is commonly done in JavaScript to create a new, anonymous scope.
+  // Example: (function() { ... })()
+  // FIXME: check for the end invocation or alternate ways to start function
+  // expressions?
+  if (Line->Tokens.size() < 5)
+    return false;
+  auto I = Line->Tokens.begin();
+  if (I->Tok->isNot(tok::l_paren))
+    return false;
+  ++I;
+  if (I->Tok->isNot(Keywords.kw_function))
+    return false;
+  ++I;
+  if (I->Tok->isNot(tok::l_paren))
+    return false;
+  ++I;
+  if (I->Tok->isNot(tok::r_paren))
+    return false;
+  ++I;
+  return I->Tok->is(tok::l_brace);
+}
+
 } // end namespace format
 } // end namespace clang
Index: unittests/Format/FormatTestJS.cpp
===================================================================
--- unittests/Format/FormatTestJS.cpp
+++ unittests/Format/FormatTestJS.cpp
@@ -367,6 +367,21 @@
                "});");
 }
 
+TEST_F(FormatTestJS, IIFE) {
+  verifyFormat("(function() {\n"
+               "var a = 1;\n"
+               "}())");
+  verifyFormat("(function() {\n"
+               "var b = 2;\n"
+               "})()");
+  verifyFormat("(function() {\n"
+               "var c = 3;\n"
+               "})();");
+  verifyFormat("(function() {\n"
+               "var d = 4;\n"
+               "}());");
+}
+
 TEST_F(FormatTestJS, GoogModules) {
   verifyFormat("goog.module('this.is.really.absurdly.long');",
                getGoogleJSStyleWithColumns(40));