message: Replace default arg syntax with ||
diff: @@ -15,7 +15,8 @@ describe("type syntax", function() {
  parser: require("flow-parser")
  };
  - function check(source, parseOptions = esprimaParserParseOptions) {
  + function check(source, parseOptions) {
  + parseOptions = parseOptions || esprimaParserParseOptions;
  var ast1 = parse(source, parseOptions);
  var code = printer.printGenerically(ast1).code;
  var ast2 = parse(code, parseOptions);
  