posthog-js crash with TypeError: Argument 1 ('element') to Window.getComputedStyle must be an instance of Element

[supermar1010]

Hello,
we saw a crash with posthog-js in our sentry tracking. The stacktrace is similiar to what was fixed with this PR: #1620
Might also be caused by rxdb. I could not really get to the root of this issue. It seems that for some reason this code runs the window?.getComputedStyle(curEl) even though curEl is not of type element.

    while (curEl && isElementNode(curEl) && !isTag(curEl, 'body')) {
        if (curEl === breakOnElement) {
            return false
        }

        if (includes(matches, window?.getComputedStyle(curEl).position)) {
            return true
        }

        curEl = getParentElement(curEl)
    }

Maybe the code checking if it is an Element is not working as expected? Maybe something weird with Safari (Apple Mail 605.1.15)?

export function isElementNode(el: Node | Element | undefined | null): el is Element {
    return !!el && el.nodeType === 1 // Node.ELEMENT_NODE - use integer constant for browser portability
}

The browser according to sentry is: Apple Mail 605.1.15

Stacktrace:

TypeError: Argument 1 ('element') to Window.getComputedStyle must be an instance of Element
  at getComputedStyle([native code])
  at s(../../../../node_modules/.pnpm/posthog-js@1.161.0/node_modules/posthog-js/dist/module.js:1:110971)
  at s(../../../../node_modules/.pnpm/posthog-js@1.161.0/node_modules/posthog-js/dist/module.js:1:111026)
  at this._mouseMoveTimeout(../../../../node_modules/.pnpm/posthog-js@1.161.0/node_modules/posthog-js/dist/module.js:1:111551)