core-js/internals/inherit-if-required.js

Standard library

var isObject = require('../internals/is-object');
var setPrototypeOf = require('../internals/object-set-prototype-of');

module.exports = function (that, target, C) {
  var S = target.constructor;
  var P;
  if (S !== C && typeof S == 'function' && (P = S.prototype) !== C.prototype && isObject(P) && setPrototypeOf) {
    setPrototypeOf(that, P);
  } return that;
};