JavaScript Is this a type annotation, an object, or something else? this type annotation typescript,this type annotation

I was looking at this code example and stumbled upon this syntax:

import React, { Component } from 'react';

const PrivateRoute = ({component:Component, ...rest}) => (
//(...)
  <Component {...props} />
// (...)
);

I'm confused about the :Component part. This looks like a static type annotation and sort of behaves like a generic one, yet this is Javascript so it can only be an object, right? If this is an object, does that mean the function is assigning a default, empty Component object to its own parameters? If so, how is it able to receive it from the caller, e.g. (as per the example):

<PrivateRoute path="/protected" component={Protected} />
Answer:1

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