getting "FindAll is not a function" error

Not sure if this is helpful, but here's a few coding examples that highlights the button. Example 4 highlights and deletes. Name mappings are not used

function examples()
{
    // Using Chrome, navigate to https://material.angular.dev/components/chips/examples
    var page = Sys.Browser("chrome").Page("https://material.angular.dev/components/chips/examples");
                
    var panel = page.FindElement("//example-viewer[@id='chips-reactive-form']//chips-reactive-form-example/section/mat-form-field//mat-chip-grid[@role='grid']");

    // Example 1
    var items = panel.FindAll(["CustomObjectType", "contentText"], ["MatChipRow", "regexp:(how-to.*)"], 100);
    for (var i = 0; i < items.length; i++) {
        Sys.HighlightObject(items[i]);
    }
    
    // Example 2
    var items = panel.FindAll(["CustomObjectType", "contentText"], ["MatChipRow", "tutorial*"], 100);
    for (var i = 0; i < items.length; i++) {
        Sys.HighlightObject(items[i]);
    }
    
    // Example 3
    var items = panel.FindElements("//span[@aria-describedby='mat-mdc-chip-7-aria-description']|//span[@aria-describedby='mat-mdc-chip-4-aria-description']");
    for (var i = 0; i < items.length; i++) {
        Sys.HighlightObject(items[i]);
    }

    // Example 4
    var panel = page.FindElement("//app-component-viewer[contains(., 'overview')]")
    // Fina all objects in the page, where CustomObjectType = MatChipRow
    var items = panel.FindAll("CustomObjectType", "MatChipRow", 100);
    // Iterate through all found objects, highlight them and then click the X button to close them
    for (var i = 0; i < items.length; i++) {
        Sys.HighlightObject(items[i]);
        items[i].Button(0).Click();        
    }
}

I also have this snippet of code,

function pagesize()
{
    var page = Sys.Browser("chrome").Page("*");
    page.contentDocument.Script.eval("document.body.style.transform='scale(0.8, 0.8)'");
    aqUtils.Delay(2000);
}

which performs JavaScript injections - which performs the same as if using Chrome DevTools. However, this functionality was last working in TC v15.55 and has been broken since. 

Hello!

I'm also working on an Angular project. For this type of project, I exclusively use XPath to retrieve my objects.

In your example, here's what I would do:

let ar = page.FindElements("//div[@role='presentation']//mat-chip-row"); //page is your parent object, this xpath returns an array of all the mat-chip-row inside your div.