@citation-js/core/lib-mjs/util/deepCopy.js

Convert different bibliographic metadata sources

export function deepCopy(value, seen = new Set()) {
  if (typeof value !== 'object' || value === null || value.constructor !== Object && value.constructor !== Array) {
    return value;
  }
  if (seen.has(value)) {
    throw new TypeError('Recursively copying circular structure');
  }
  seen.add(value);
  let copy;
  if (value.constructor === Array) {
    copy = value.map(value => deepCopy(value, seen));
  } else {
    const object = {};
    for (const key in value) {
      object[key] = deepCopy(value[key], seen);
    }
    copy = object;
  }
  seen.delete(value);
  return copy;
}
export default deepCopy;