How do I fix “Expected to return a value at the end of arrow function” warning?

The error you are getting states that your arrow function (comment) => { doesn't have a return statement. While it does for when your if-case is true, it does not return anything for when it's false.

return this.props.comments.map((comment) => {
if (comment.hasComments === true) {
return (
<div key={comment.id}>
<CommentItem className="MainComment" />
{this.props.comments.map(commentReply => {
if (commentReply.replyTo === comment.id) {
return (
<CommentItem className="SubComment"/>
)
}
})
}
</div>
)
} else {
//return something here.
}
});