Yang

> Did you manage to resolve this issue? > > I am with the same bug. I used version 2.6.14 to run test cases. The first one was not passed....

> 现在编译后的效果是这样的 > > ```js > function greet(person, date) { > console.log("Hello ".concat(person, ", today is ").concat(date, "!")); > } > ```

```JavaScript function toList(arr) { return arr.reduce((prev, current, index) => { return prev.concat(current, ...( current.children && current.children.length > 0 ? toList(current.children) : [] )) }, []) } ```