Popup header can't be removed in arcgis javascript API 4.28

[SoulaimaneBenmessaoud]

I would like to remove the header of the popup, but it is not possible to achieve this by overriding the CSS class directly. This limitation arises because the header is wrapped within a shadow root, as implemented by the calcite components. I am using arcgis javascript API version 4.28.9

[JoelBennett]

I don't think there's a documented way to do this.  However, if the following executes prior to the creation of the Popup, it appears to achieve the desired results:

require(["esri/chunks/panel"], function(panel) {
    panel.Panel.prototype.renderHeaderNode = function() { return null; };
});

[SoulaimaneBenmessaoud]

Okay, I see, but I am currently using the @ArcGIS/core library. Even when I try to find the module, I get an error that it can't be found. I see that there is not a module named 'panel' inside the 'chunks' directory.

require(['@arcgis/chunks/panel'], function (panel) {
  panel.Panel.prototype.renderHeaderNode = function () {
    return null;
  };
});

[JoelBennett]

In that case, you'll need to use ESM syntax:

import * as panel from "@arcgis/core/chunks/panel.js";

panel.P.prototype.renderHeaderNode = function() { return null; };

[ViktorSafar]

There is no `panel.js` under `@arcgis/core/chunks`

v4.28.9

[JoelBennett]

I suppose there's some difference I can't explain, but here it is.

[ViktorSafar]

While I was able to make that import work and use the advised update to prototype.renderHeaderNode, it does not help as it corrupts the entire popup:

[JoelBennett]

Hmm...it worked well in a simplistic example I set up locally.  Does it cause any error information to be written to the developer tools console when you try it?

[ViktorSafar]

I spoke too soon, it did not work. Import directly from the URL, while it should be possible, fails.

If I download the file and save it as node_modules/@arcgis/core/chunks/panel.js, compiler starts complaining

Here is a simple repro solution

https://github.com/viktor-safar-geodata/popup-header

[JoelBennett]

I see...there are some extra layers of complexity added by Node and React that I'm not sure how to help you navigate.  If you don't find a way to get this working, @Justin_Greco provided another viable solution.