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lightweight_singleton.js

let obj = Object.create(null) // prototypeless object 
/* obj.propKey = propValue; */// prototypeless also means constructorless, resulting in the term of "singleton"
let isInstance = new obj
console.log(isInstance) // TypeError: obj is not a constructor – that's what you suppose to expect

// ===

// NOTE : constructorless can be prototype-based, but not vise versa with regards to example shown above !
// For more read about : @https://dev.to/projektorius96/constructorless-namespaces-in-es5-es6-14pk