JavaScript: Remove duplicates from an array of objects based on key

var users = [ 
  {
    name: 'Rahul', email: 'test1@test.com' 
  }, 
  {
    name: 'Rajeev', email: 'test2@test.com' 
  }, 
  {
    name: 'Revanth', email: 'test2@test.com' 
  }
];

let emailIds = users.map( (item) => { 
  return item.email;
}) 

let filtered = users.filter ( (item, index) => { 
  return !emailIds.includes(item.email, index+1);
}) 
console.log(filtered);

Output:
[
  { name: 'Rahul', email: 'test1@test.com' },
  { name: 'Revanth', email: 'test2@test.com' }
]

Execute above code here