NodeJS check typeOf node/module (Puppeteer)

Question

i am struggling with type checking at nodejs. I plan to use the library Puppeteer to test my own web pages. For this I would like to check in the methods that the function arguments have the correct type.

How do I access the type "Page" from the module "Puppeteer"?

Here's a code example

const pup = require('puppeteer');

/**
 * 
 * @param {puppeteer.page} page Puppeter Browser Page (Tab)
 */
async function navigateToPage(page){
    if(page instanceof page) throw("The passed variable page is not typeOf puppeteer.page")

} 

Answer 1

i did this to get the class name :

const puppeteer = require('puppeteer');

(async () => {
    const browser = await puppeteer.launch({headless: true, args: ['--no-sandbox']});
    const page = await browser.newPage();
    console.log(page.constructor.name);
    process.exit(0);
    // show Page
})();

And i found a file in source code defining this class :

https://github.com/puppeteer/puppeteer/blob/main/src/common/Page.ts

but when i explore the node module folder i found it here : 'puppeteer/lib/cjs/puppeteer/common/Page'

nevertheless, this code seems to work.

const puppeteer = require('puppeteer');
const {Page} = require('puppeteer/lib/cjs/puppeteer/common/Page');

(async () => {
    const browser = await puppeteer.launch({headless: true, args: ['--no-sandbox']});
    const page = await browser.newPage();
    console.log(page instanceof Page);

})();

what do you try to achieve with that ?