How to pass a function in Puppeteers .evaluate() method?

Question

Whenever I try to pass a function, like this:

var myFunc = function() { console.log(\"lol\"); };

await page.evaluate(func => {
 func();
 return true;
},          


        

Answer 1

Pass function with parameter

// add it manually and expose to window

 await page.evaluate(() => {
      window.myFunc = function(element) { element.innerHTML = "baz" };
    });

// and then call function declared above

 await page.evaluate((param) => {
         myFunc (param);
    }, param);