message: Add a printer case for TSExportAssignment.
diff: @@ -475,6 +475,9 @@ function genericPrintNoParens(path, options, print) {
  }
  return path.call(print, "id");
  + case "TSExportAssignment":
  + return concat(["export = ", path.call(print, "expression")]);
  +
  case "ExportDeclaration":
  case "ExportDefaultDeclaration":
  case "ExportNamedDeclaration":
  