utilities deepFreeze.ts

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  // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/freeze#examples
function deepFreeze(object) {
  // Retrieve the property names defined on object
  const propNames = Object.getOwnPropertyNames(object);
 
  // Freeze properties before freezing self
 
  for (const name of propNames) {
    const value = object[name];
 
    if (value && typeof value === 'object') {
      deepFreeze(value);
    }
  }
 
  return Object.freeze(object);
}
 
export default deepFreeze;