diff --git a/clang/lib/Format/ContinuationIndenter.cpp b/clang/lib/Format/ContinuationIndenter.cpp
--- a/clang/lib/Format/ContinuationIndenter.cpp
+++ b/clang/lib/Format/ContinuationIndenter.cpp
@@ -492,9 +492,10 @@
       return true;
   }
 
-  // Break after the closing parenthesis of TypeScript decorators.
+  // Break after the closing parenthesis of TypeScript decorators before `get`.
   if (Style.Language == FormatStyle::LK_JavaScript &&
-      Previous.is(tok::r_paren) && Previous.is(TT_JavaAnnotation)) {
+      Current.TokenText == "get" && Previous.is(tok::r_paren) &&
+      Previous.is(TT_JavaAnnotation)) {
     return true;
   }
 
diff --git a/clang/unittests/Format/FormatTestJS.cpp b/clang/unittests/Format/FormatTestJS.cpp
--- a/clang/unittests/Format/FormatTestJS.cpp
+++ b/clang/unittests/Format/FormatTestJS.cpp
@@ -701,8 +701,12 @@
                    getGoogleJSStyleWithColumns(20)));
 }
 
-TEST_F(FormatTestJS, FormatsDecoratedFunctions) {
-  // Regression test: ensure that there is a break before `get`.
+TEST_F(FormatTestJS, FormatsDecorators) {
+  // No line break after argument decorators.
+  verifyFormat("class A {\n"
+               "  constructor(@arg(DECOR) private arg: Type) {}\n"
+               "}");
+  // Ensure that there is a break before `get`.
   EXPECT_EQ("class A {\n"
             "  private p = () => {}\n"
             "\n"