I am getting promise error when i am returning pnpjs in spfx webpart.

Question

I am getting data from sharepoint list using pnpjs and adding it to table. here when i am returning this pnp js getting below error.

 

 

 

Please find the below code for the same.

private async getListData(){
return await pnp.sp.web.lists.getByTitle("EmployeeDetails").items.select().get().then(allitems=>{
return allitems.map(val=>{
<tr key={val.ID}>
<td>{val.Title}</td>
<td>{val.PhoneNumber}</td>
<td>{val.Address}</td>
<td>{val.Department}</td>
</tr>
});
});
}