luma.gl/test/utils/deep-copy.ts

// Recursively copies objects
export default function deepCopy(object: Record<string, any>) {
  if (Array.isArray(object)) {
    return object.map((element) => deepCopy(element));
  }

  if (object !== null && typeof object === 'object') {
    const newObject = {};
    for (const key in object) {
      newObject[key] = deepCopy(object[key]);
    }
    return newObject;
  }

  return object;
}