Function deepAssign

src/util/object-utils.ts:5–24

(target: T, source: S)

// Like Object.assign but does a deep copy.
export function deepAssign<T extends AnyObject, S extends AnyObject>(target: T, source: S): T {
  if (!source)
    return target;
  for (const key of Object.keys(source)) {
    const value = source[key];
    if (typeof value == 'object' && value !== null) {
      // eslint-disable-next-line no-prototype-builtins
      if (target.hasOwnProperty(key) &&
          typeof target[key as keyof T] == 'object' &&
          target[key as keyof T] !== null) {
        deepAssign(target[key], value);
      } else {
        target[key as keyof T] = value;
      }
    } else {
      target[key as keyof T] = value;
    }
  }
  return target;
}

// Like Object.assign but ignore null or undefined properties.
export function nonNullAssign<T extends object, S extends object>(target: T, source: S): T {