What is the most efficient way to deep clone an object in the JavaScript?

Answer

 The name of deep cloning is Native deep cloning 
There's now a JS standard called "structured cloning", that works experimentally in Node 11 and later, will land in browsers, and which has polyfills for existing systems.

structuredClone(value)
If needed, loading the polyfill first:

import structuredClone from '@ungap/structured-clone';