diff --git a/clang/lib/Format/Format.cpp b/clang/lib/Format/Format.cpp
--- a/clang/lib/Format/Format.cpp
+++ b/clang/lib/Format/Format.cpp
@@ -939,6 +939,7 @@
     GoogleStyle.AlignAfterOpenBracket = FormatStyle::BAS_AlwaysBreak;
     GoogleStyle.AlignOperands = false;
     GoogleStyle.AllowShortFunctionsOnASingleLine = FormatStyle::SFS_Empty;
+    GoogleStyle.AllowShortLambdasOnASingleLine = FormatStyle::SLS_All;
     GoogleStyle.AlwaysBreakBeforeMultilineStrings = false;
     GoogleStyle.BreakBeforeTernaryOperators = false;
     // taze:, triple slash directives (`/// <...`), tslint:, and @see, which is
diff --git a/clang/lib/Format/TokenAnnotator.cpp b/clang/lib/Format/TokenAnnotator.cpp
--- a/clang/lib/Format/TokenAnnotator.cpp
+++ b/clang/lib/Format/TokenAnnotator.cpp
@@ -3142,6 +3142,23 @@
       // JavaScript top-level enum key/value pairs are put on separate lines
       // instead of bin-packing.
       return true;
+    if (Right.is(tok::r_brace) && Left.is(tok::l_brace) && Left.Previous &&
+        Left.Previous->is(TT_JsFatArrow)) {
+      // JS arrow function (=> {...}).
+      switch (Style.AllowShortLambdasOnASingleLine) {
+      case FormatStyle::SLS_All:
+        return false;
+      case FormatStyle::SLS_None:
+        return true;
+      case FormatStyle::SLS_Empty:
+        return !Left.Children.empty();
+      case FormatStyle::SLS_Inline:
+        return (Left.NestingLevel == 0 && Line.Level == 0);
+      default:
+        break;
+      }
+    }
+
     if (Right.is(tok::r_brace) && Left.is(tok::l_brace) &&
         !Left.Children.empty())
       // Support AllowShortFunctionsOnASingleLine for JavaScript.
diff --git a/clang/unittests/Format/FormatTestJS.cpp b/clang/unittests/Format/FormatTestJS.cpp
--- a/clang/unittests/Format/FormatTestJS.cpp
+++ b/clang/unittests/Format/FormatTestJS.cpp
@@ -458,9 +458,7 @@
 
   // Arrow functions in object literals.
   verifyFormat("var x = {\n"
-               "  y: (a) => {\n"
-               "    return a;\n"
-               "  }\n"
+               "  y: (a) => { return a; },\n"
                "};");
   verifyFormat("var x = {y: (a) => a};");
 
@@ -485,9 +483,7 @@
                "};");
 
   // Object literals can leave out labels.
-  verifyFormat("f({a}, () => {\n"
-               "  g();  //\n"
-               "});");
+  verifyFormat("f({a}, () => { g(); });");
 
   // Keys can be quoted.
   verifyFormat("var x = {\n"
@@ -1111,9 +1107,7 @@
 }
 
 TEST_F(FormatTestJS, ArrowFunctions) {
-  verifyFormat("var x = (a) => {\n"
-               "  return a;\n"
-               "};");
+  verifyFormat("var x = (a) => { return a; };\n");
   verifyFormat("var x = (a) => {\n"
                "  function y() {\n"
                "    return 42;\n"
@@ -1121,6 +1115,7 @@
                "  return a;\n"
                "};");
   verifyFormat("var x = (a: type): {some: type} => {\n"
+               "  y;\n"
                "  return a;\n"
                "};");
   verifyFormat("var x = (a) => a;");
@@ -1147,10 +1142,36 @@
                "        // break\n"
                "    );");
   verifyFormat("const f = (x: string|null): string|null => {\n"
+               "  y;\n"
                "  return x;\n"
                "}\n");
 }
 
+TEST_F(FormatTestJS, ArrowFunctionStyle) {
+  FormatStyle Style = getGoogleStyle(FormatStyle::LK_JavaScript);
+  Style.AllowShortLambdasOnASingleLine = FormatStyle::SLS_All;
+  verifyFormat("const arr = () => { x; };", Style);
+  Style.AllowShortLambdasOnASingleLine = FormatStyle::SLS_None;
+  verifyFormat("const arr = () => {\n"
+               "  x;\n"
+               "};",
+               Style);
+  Style.AllowShortLambdasOnASingleLine = FormatStyle::SLS_Empty;
+  verifyFormat("const arr = () => {\n"
+               "  x;\n"
+               "};",
+               Style);
+  verifyFormat("const arr = () => {};",
+               Style);
+  Style.AllowShortLambdasOnASingleLine = FormatStyle::SLS_Inline;
+  verifyFormat("const arr = () => {\n"
+               "  x;\n"
+               "};",
+               Style);
+  verifyFormat("foo(() => {});",
+               Style);
+}
+
 TEST_F(FormatTestJS, ReturnStatements) {
   verifyFormat("function() {\n"
                "  return [hello, world];\n"
@@ -1711,10 +1732,12 @@
 TEST_F(FormatTestJS, RemoveEmptyLinesInArrowFunctions) {
   verifyFormat("x = () => {\n"
                "  foo();\n"
+               "  bar();\n"
                "};\n",
                "x = () => {\n"
                "\n"
                "  foo();\n"
+               "  bar();\n"
                "\n"
                "};\n");
 }