How to delete recursively undefined properties from an object - while keeping the constructor chain?

Question

This is a question similar to How to remove undefined and null values from an object using lodash?. However, the solutions proposed there do not conserve the constructor. In add

Answer 1

You can use the rundef package.

By default, it will replace all top-level properties with values set to undefined. However it supports the following options:

• mutate - set this to false to return the same object that you have provided; this will ensure the constructor is not changed
• recursive - set this to true to recursively process your object

Therefore, for your use case, you can run:

rundef(object, false, true)