Index: lib/Format/BreakableToken.h
===================================================================
--- lib/Format/BreakableToken.h
+++ lib/Format/BreakableToken.h
@@ -90,7 +90,8 @@
   /// \p LineIndex, if previously broken at \p TailOffset. If possible, do not
   /// violate \p ColumnLimit.
   virtual Split getSplit(unsigned LineIndex, unsigned TailOffset,
-                         unsigned ColumnLimit) const = 0;
+                         unsigned ColumnLimit,
+                         llvm::Regex &CommentPragmasRegex) const = 0;
 
   /// \brief Emits the previously retrieved \p Split via \p Whitespaces.
   virtual void insertBreak(unsigned LineIndex, unsigned TailOffset, Split Split,
@@ -198,8 +199,8 @@
                          bool InPPDirective, encoding::Encoding Encoding,
                          const FormatStyle &Style);
 
-  Split getSplit(unsigned LineIndex, unsigned TailOffset,
-                 unsigned ColumnLimit) const override;
+  Split getSplit(unsigned LineIndex, unsigned TailOffset, unsigned ColumnLimit,
+                 llvm::Regex &CommentPragmasRegex) const override;
   void insertBreak(unsigned LineIndex, unsigned TailOffset, Split Split,
                    WhitespaceManager &Whitespaces) override;
   void compressWhitespace(unsigned LineIndex, unsigned TailOffset, Split Split,
@@ -218,8 +219,8 @@
 
 public:
   unsigned getLineCount() const override;
-  Split getSplit(unsigned LineIndex, unsigned TailOffset,
-                 unsigned ColumnLimit) const override;
+  Split getSplit(unsigned LineIndex, unsigned TailOffset, unsigned ColumnLimit,
+                 llvm::Regex &CommentPragmasRegex) const override;
   void compressWhitespace(unsigned LineIndex, unsigned TailOffset, Split Split,
                           WhitespaceManager &Whitespaces) override;
 
Index: lib/Format/BreakableToken.cpp
===================================================================
--- lib/Format/BreakableToken.cpp
+++ lib/Format/BreakableToken.cpp
@@ -200,7 +200,8 @@
 
 BreakableToken::Split
 BreakableStringLiteral::getSplit(unsigned LineIndex, unsigned TailOffset,
-                                 unsigned ColumnLimit) const {
+                                 unsigned ColumnLimit,
+                                 llvm::Regex &CommentPragmasRegex) const {
   return getStringSplit(Line.substr(TailOffset),
                         StartColumn + Prefix.size() + Postfix.size(),
                         ColumnLimit, Style.TabWidth, Encoding);
@@ -231,9 +232,13 @@
 
 unsigned BreakableComment::getLineCount() const { return Lines.size(); }
 
-BreakableToken::Split BreakableComment::getSplit(unsigned LineIndex,
-                                                 unsigned TailOffset,
-                                                 unsigned ColumnLimit) const {
+BreakableToken::Split
+BreakableComment::getSplit(unsigned LineIndex, unsigned TailOffset,
+                           unsigned ColumnLimit,
+                           llvm::Regex &CommentPragmasRegex) const {
+  // Don't break lines matching the comment pragmas regex.
+  if (CommentPragmasRegex.match(Content[LineIndex]))
+    return Split(StringRef::npos, 0);
   return getCommentSplit(Content[LineIndex].substr(TailOffset),
                          getContentStartColumn(LineIndex, TailOffset),
                          ColumnLimit, Style.TabWidth, Encoding);
Index: lib/Format/ContinuationIndenter.cpp
===================================================================
--- lib/Format/ContinuationIndenter.cpp
+++ lib/Format/ContinuationIndenter.cpp
@@ -1183,7 +1183,6 @@
     }
   } else if (Current.is(TT_BlockComment)) {
     if (!Current.isTrailingComment() || !Style.ReflowComments ||
-        CommentPragmasRegex.match(Current.TokenText.substr(2)) ||
         // If a comment token switches formatting, like
         // /* clang-format on */, we don't want to break it further,
         // but we may still want to adjust its indentation.
@@ -1234,8 +1233,8 @@
     RemainingTokenColumns = Token->getLineLengthAfterSplitBefore(
         LineIndex, TailOffset, RemainingTokenColumns, ColumnLimit, SplitBefore);
     while (RemainingTokenColumns > RemainingSpace) {
-      BreakableToken::Split Split =
-          Token->getSplit(LineIndex, TailOffset, ColumnLimit);
+      BreakableToken::Split Split = Token->getSplit(
+          LineIndex, TailOffset, ColumnLimit, CommentPragmasRegex);
       if (Split.first == StringRef::npos) {
         // The last line's penalty is handled in addNextStateToQueue().
         if (LineIndex < EndIndex - 1)
Index: unittests/Format/FormatTestJS.cpp
===================================================================
--- unittests/Format/FormatTestJS.cpp
+++ unittests/Format/FormatTestJS.cpp
@@ -1607,6 +1607,27 @@
       " * @param This is a long comment but no type\n"
       " */",
       getGoogleJSStyleWithColumns(20));
+  // Don't break @param line, but reindent it and reflow unrelated lines.
+  verifyFormat("{\n"
+               "  /**\n"
+               "   * long long long\n"
+               "   * long\n"
+               "   * @param {this.is.a.long.path.to.a.Type} a\n"
+               "   * long long long\n"
+               "   * long long\n"
+               "   */\n"
+               "  function f(a) {}\n"
+               "}",
+               "{\n"
+               "/**\n"
+               " * long long long long\n"
+               " * @param {this.is.a.long.path.to.a.Type} a\n"
+               " * long long long long\n"
+               " * long\n"
+               " */\n"
+               "  function f(a) {}\n"
+               "}",
+               getGoogleJSStyleWithColumns(20));
 }
 
 TEST_F(FormatTestJS, RequoteStringsSingle) {
@@ -1695,6 +1716,5 @@
                getGoogleJSStyleWithColumns(25));
   verifyFormat("// taze: x from 'location'", getGoogleJSStyleWithColumns(10));
 }
-
 } // end namespace tooling
 } // end namespace clang