core-js/modules/$.set-proto.js

Standard library

// Works with __proto__ only. Old v8 can't work with null proto objects.
/* eslint-disable no-proto */
var getDesc  = require('./$').getDesc
  , isObject = require('./$.is-object')
  , anObject = require('./$.an-object');
var check = function(O, proto){
  anObject(O);
  if(!isObject(proto) && proto !== null)throw TypeError(proto + ": can't set as prototype!");
};
module.exports = {
  set: Object.setPrototypeOf || ('__proto__' in {} // eslint-disable-line
    ? function(buggy, set){
        try {
          set = require('./$.ctx')(Function.call, getDesc(Object.prototype, '__proto__').set, 2);
          set({}, []);
        } catch(e){ buggy = true; }
        return function setPrototypeOf(O, proto){
          check(O, proto);
          if(buggy)O.__proto__ = proto;
          else set(O, proto);
          return O;
        };
      }()
    : undefined),
  check: check
};