clang-format: [JS] do not wrap before any `is`.

Summary:
`is` type annotations can occur at any nesting level. For example:

    function x() {
      return function y(): a is B { ... };
    }

Breaking before the `is` above breaks TypeScript parsing the code. This
change prevents the wrap.

Reviewers: krasimir

Subscribers: klimek, cfe-commits

Differential Revision: https://reviews.llvm.org/D47193

llvm-svn: 332968

1 files changed, 1 insertions, 1 deletions

diff --git a/clang/lib/Format/TokenAnnotator.cpp b/clang/lib/Format/TokenAnnotator.cpp
index 2fe1e24709c..56f1841222c 100644
--- a/clang/lib/Format/TokenAnnotator.cpp
+++ b/clang/lib/Format/TokenAnnotator.cpp
@@ -2958,7 +2958,7 @@ bool TokenAnnotator::canBreakBefore(const AnnotatedLine &Line,
       return false;
     if (Left.is(TT_JsTypeColon))
       return true;
-    if (Right.NestingLevel == 0 && Right.is(Keywords.kw_is))
+    if (Right.is(Keywords.kw_is))
       return false;
     if (Left.is(Keywords.kw_in))
       return Style.BreakBeforeBinaryOperators == FormatStyle::BOS_None;