This is a recursive JS function that checks if a property is shared between N number of objects. Uses rest parameters.

sharedprop.js

export default function sharedProp(p: string, ...objects: object[]){
  if(objects.length == 0){
    return false;
  }
  else if(objects.length == 1){
    return objects[0].hasOwnProperty(p);
  }
  return objects[0].hasOwnProperty(p) && sharedProp(p, ...objects.slice(1));
}

test.js

import sharedProp from './sharedProp.js';

let a = {a:1,b:2};
let b = {a:3,c:4};
let c = {a:5, d:6};
console.log(sharedProp('a'));
console.log(sharedProp('a', a));
console.log(sharedProp('a', b));
console.log(sharedProp('a', c));
console.log(sharedProp('a', a, b));
console.log(sharedProp('a', b, c));
console.log(sharedProp('a', a, c));
console.log(sharedProp('a', a, b, c));