clang-format: [JS] whitespace between keywords and parenthesized expressions.

[mprobst]

Summary

throw (...) should have a whitespace following it, as do await and void.

[djasper]

LG

lib/Format/TokenAnnotator.cpp

if (Right.is(tok::star) &&
       return false;
     if (Right.isOneOf(tok::l_brace, tok::l_square) &&
         Left.isOneOf(Keywords.kw_function, Keywords.kw_yield))
       return true;
     // JS methods can use some keywords as names (e.g. `delete()`).
     if (Right.is(tok::l_paren) && Line.MustBeDeclaration &&
         Left.Tok.getIdentifierInfo())
       return false;
+    if (Right.is(tok::l_paren) &&
+        Left.isOneOf(tok::kw_throw, Keywords.kw_await, tok::kw_void))
+      return true;
     if ((Left.isOneOf(Keywords.kw_let, Keywords.kw_var, Keywords.kw_in,
                       tok::kw_const) ||
          // "of" is only a keyword if it appears after another identifier
          // (e.g. as "const x of y" in a for loop).
          (Left.is(Keywords.kw_of) && Left.Previous &&
           Left.Previous->Tok.getIdentifierInfo())) &&
         (!Left.Previous || !Left.Previous->is(tok::period)))
       return true;

unittests/Format/FormatTestJS.cpp

verifyFormat(
       "    x();\n"
       "  }\n"
       "  let() {\n"
       "    x();\n"
       "  }\n"
       "}\n");
 }
 
+TEST_F(FormatTestJS, ReservedWordsParenthesized) {
+  // All of these are statements using the keyword, not function calls.
+  verifyFormat("throw (x + y);\n"
+               "await (await x).y;\n"
+               "void (0);\n"
+               "delete (x.y);\n"
+               "return (x);\n");
+}
+
 TEST_F(FormatTestJS, CppKeywords) {
   // Make sure we don't mess stuff up because of C++ keywords.
   verifyFormat("return operator && (aa);");
   // .. or QT ones.
   verifyFormat("slots: Slot[];");
 }
 
 TEST_F(FormatTestJS, ES6DestructuringAssignment) {