clang-format: [JS] space between ! assert and in.

[mprobst]

Summary

Before:

x = y!in z;

After:

x = y! in z;

[djasper]

Looks good.

lib/Format/TokenAnnotator.cpp

if (Left.is(TT_TemplateCloser) &&
         !Right.isOneOf(tok::equal, tok::l_brace, tok::comma, tok::l_square,
                        Keywords.kw_implements, Keywords.kw_extends))
       // Type assertions ('<type>expr') are not followed by whitespace. Other
       // locations that should have whitespace following are identified by the
       // above set of follower tokens.
       return false;
     if (Right.is(TT_JsNonNullAssertion))
       return false;
-    if (Left.is(TT_JsNonNullAssertion) && Right.is(Keywords.kw_as))
-      return true; // "x! as string"
+    if (Left.is(TT_JsNonNullAssertion) &&
+        Right.isOneOf(Keywords.kw_as, Keywords.kw_in))
+      return true; // "x! as string", "x! in y"
   } else if (Style.Language == FormatStyle::LK_Java) {
     if (Left.is(tok::r_square) && Right.is(tok::l_brace))
       return true;
     if (Left.is(Keywords.kw_synchronized) && Right.is(tok::l_paren))
       return Style.SpaceBeforeParens != FormatStyle::SBPO_Never;
     if ((Left.isOneOf(tok::kw_static, tok::kw_public, tok::kw_private,
                       tok::kw_protected) ||
          Left.isOneOf(Keywords.kw_final, Keywords.kw_abstract,

unittests/Format/FormatTestJS.cpp

verifyFormat("foo = <Bar[]>[\n"
                "  1,  //\n"
                "  2\n"
                "];");
   verifyFormat("var x = [{x: 1} as type];");
   verifyFormat("x = x as [a, b];");
   verifyFormat("x = x as {a: string};");
   verifyFormat("x = x as (string);");
   verifyFormat("x = x! as (string);");
+  verifyFormat("x = y! in z;");
   verifyFormat("var x = something.someFunction() as\n"
                "    something;",
                getGoogleJSStyleWithColumns(40));
 }
 
 TEST_F(FormatTestJS, TypeArguments) {
   verifyFormat("class X<Y> {}");
   verifyFormat("new X<Y>();");