clang-format: [JS] test declared fields.

Summary:
TypeScript now supports declaring fields:

    class Foo {
      declare field: string;
    }

clang-format happens to already format this fine, so this change just
adds a regression test.

Reviewers: krasimir

Subscribers: cfe-commits

Tags: #clang

Differential Revision: https://reviews.llvm.org/D69972

1 files changed, 7 insertions, 0 deletions

diff --git a/clang/unittests/Format/FormatTestJS.cpp b/clang/unittests/Format/FormatTestJS.cpp
index 30a0b37ef69..619a19f1a22 100644
--- a/clang/unittests/Format/FormatTestJS.cpp
+++ b/clang/unittests/Format/FormatTestJS.cpp
@@ -2369,5 +2369,12 @@ TEST_F(FormatTestJS, SupportPrivateFieldsAndMethods) {
                "  static #staticPrivateMethod() {}\n");
 }
 
+TEST_F(FormatTestJS, DeclaredFields) {
+  verifyFormat("class Example {\n"
+               "  declare pub: string;\n"
+               "  declare private priv: string;\n"
+               "}\n");
+}
+
 } // namespace format
 } // end namespace clang