Break Permission on ListItem using pnp

private BreakInheritPermissionListItem():void

{

pnp.sp.web.lists.getByTitle("Employee").items.getById(9)

.breakRoleInheritance(true).then(function(response)

{

console.log("Item Permission breaked successfully");

}).catch(function(exception)

{

alert("Something went wrong :"+exception);

});

}