Recursive Object.assign / merge

recursiveAssign.js

const isPlainObject = object => Object.prototype.toString.call(object) === '[object Object]'
const recursiveAssign = (target, ...sources) => {
  sources.forEach(source => {
    Object.entries(source).forEach(([key, value]) => {
      if (isPlainObject(target[key]) && isPlainObject(value)) recursiveAssign(target[key], value)
      else target[key] = value
    })
  })
  return target
}


// Minified + IIFE:
const recursiveAssign=(()=>{let c=o=>'[object Object]'==={}.toString.call(o),a=(t,...s)=>(s.forEach(s=>Object.entries(s).forEach(([k,v])=>c(t[k])&&c(v)?a(t[k],v):t[k]=v)),t);return a})()