maybe an error in Chapter 6 about ‘isEmpty’

[vickmeng]

isEmpty第一段示例代码，不是应该在吐出第一条数据的时候吐出false吗？书上写的true

const source$ = interval(10000);

const isEmpty$ = source$.pipe( isEmpty() ); isEmpty$ .subscribe( console.log, () => { console.log('error'); }, () => { console.log('complete'); } );

// 10秒后 // false // complete