1 files changed, 13 insertions, 0 deletions
diff --git a/clang/lib/Format/TokenAnnotator.cpp b/clang/lib/Format/TokenAnnotator.cpp
index 96b1df82e56..69b703d03c1 100644
--- a/clang/lib/Format/TokenAnnotator.cpp
+++ b/clang/lib/Format/TokenAnnotator.cpp
@@ -141,6 +141,9 @@ private:
          Left->Previous->is(TT_BinaryOperator))) {
       // static_assert, if and while usually contain expressions.
       Contexts.back().IsExpression = true;
+    } else if (Style.Language == FormatStyle::LK_JavaScript && Left->Previous &&
+               Left->Previous->is(Keywords.kw_function)) {
+      Contexts.back().IsExpression = false;
     } else if (Left->Previous && Left->Previous->is(tok::r_square) &&
                Left->Previous->MatchingParen &&
                Left->Previous->MatchingParen->is(TT_LambdaLSquare)) {
@@ -518,6 +521,14 @@ private:
         Tok->Type = TT_InlineASMColon;
       }
       break;
+    case tok::pipe:
+    case tok::amp:
+      // | and & in declarations/type expressions represent union and
+      // intersection types, respectively.
+      if (Style.Language == FormatStyle::LK_JavaScript &&
+          !Contexts.back().IsExpression)
+        Tok->Type = TT_JsTypeOperator;
+      break;
     case tok::kw_if:
     case tok::kw_while:
       if (CurrentToken && CurrentToken->is(tok::l_paren)) {
@@ -2051,6 +2062,8 @@ bool TokenAnnotator::spaceRequiredBefore(const AnnotatedLine &Line,
       return true;
     if (Right.isOneOf(TT_JsTypeColon, TT_JsTypeOptionalQuestion))
       return false;
+    if (Left.is(TT_JsTypeOperator) || Right.is(TT_JsTypeOperator))
+      return false;
     if ((Left.is(tok::l_brace) || Right.is(tok::r_brace)) &&
         Line.First->isOneOf(Keywords.kw_import, tok::kw_export))
       return false;