Function merge

packages/core/src/utils/merge.ts:8–31

(initialObj: T, mergeObj: T, levels = 2)

 * By default, this merges 2 levels deep.
 */
export function merge<T>(initialObj: T, mergeObj: T, levels = 2): T {
  // If the merge value is not an object, or we have no merge levels left,
  // we just set the value to the merge value
  if (!mergeObj || typeof mergeObj !== 'object' || levels <= 0) {
    return mergeObj;
  }

  // If the merge object is an empty object, and the initial object is not undefined, we return the initial object
  if (initialObj && Object.keys(mergeObj).length === 0) {
    return initialObj;
  }

  // Clone object
  const output = { ...initialObj };

  // Merge values into output, resursively
  for (const key in mergeObj) {
    if (Object.prototype.hasOwnProperty.call(mergeObj, key)) {
      output[key] = merge(output[key], mergeObj[key], levels - 1);
    }
  }

  return output;
}