@onesy/utils/esm/copy.js

Utils

const isArray = value => Array.isArray(value);

const isObject = value => typeof value === 'object' && !!value && value.constructor === Object; // It keeps the references of the methods and classes,
// unlike JSON.stringify usually used for deep simple copy


const copy = (value, values_) => {
  const values = !values_ ? new WeakSet() : values_; // Ref circular value

  if (values.has(value)) return value;
  if (isObject(value) || isArray(value)) values.add(value);
  if (isArray(value)) return value.map(item => copy(item, values));

  if (isObject(value)) {
    const newValue = {};
    Object.keys(value).forEach(key => newValue[key] = copy(value[key], values));
    return newValue;
  }

  return value;
};

export default copy;