Check if the argument provided is a function & not a Mongoose model

[samislam]

I am writing a middleware. The middleware accepts two arguments, either a mongoose Model or a normal JavaScript function.

function someMiddleware(arg1){
   // here, how to differentiate?
   if(typeof arg1 === 'function') console.log("it's a function")
}

Mongoose models are functions, but I want the consumer of my someMiddleware function to be able to pass a model or a normal function.

But how can I differentiate between both in my code?

asked also on StackOverflow, but did not get a fulfilling answer:

https://stackoverflow.com/questions/72874584/check-if-the-argument-provided-is-a-function-not-a-mongoose-model

[vkarpov15]

Object.getPrototypeOf(arg1) !== mongoose.Model