owtlab-tracking/lib/utils/deepExtend.js

A simple Tracking system

export const deepExtend = function (target) {
  for (let i = 1; i < arguments.length; i++) {
    // Copy unique items from incoming array
    if (target instanceof Array && arguments[i] instanceof Array) {
      for (let j = 0; j < arguments[i].length; j++) {
        if (target.indexOf(arguments[i][j]) < 0) {
          target.push(arguments[i][j]);
        }
      }
    }
    // Blend objects
    else {
      for (const prop in arguments[i]) {
        // Recurse when both contain objects of same name
        // and incoming is not a null object
        if (
          typeof target[prop] !== 'undefined' &&
          typeof target[prop] === 'object' &&
          typeof arguments[i][prop] === 'object' &&
          arguments[i][prop] !== null
        ) {
          deepExtend(target[prop], clone(arguments[i][prop]));
        }
        // Otherwise just copy it over...
        else if (
          arguments[i][prop] !== undefined &&
          typeof arguments[i][prop] !== 'function'
        ) {
          target[prop] = clone(arguments[i][prop]);
        }
      }
    }
  }
  return target;
};

function clone(input) {
  return JSON.parse(JSON.stringify(input));
}