managers getAllChildren.ts

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  function getChildren(node: Node): Node[] {
 
    const children: Node[] = [];
 
    if (node instanceof HTMLSlotElement) {
 
        const childNodes = node.assignedNodes({ flatten: true });
 
        children.push(...childNodes);
    }
    else if (node instanceof HTMLElement) {
 
        // Add the nodes of the slots if any
        let slots = (node as any).querySelectorAll('slot');
 
        slots.forEach(slot => {
 
            const childNodes = slot.assignedNodes({ flatten: true });
 
            children.push(...childNodes);
        });
 
        // Add the child nodes that are not in a slot
        let childNodes = Array.from(node.childNodes);
 
        children.push(...childNodes);
 
        if (node.shadowRoot === null) {
 
            return children;
        }
 
        // Do the same for the shadow root
        node = node.shadowRoot;
 
        // It seems that the slots from the shadowRoot and host are the same so we don't need to repeat the operation for the shadowRoot
 
        // Add the child nodes that are not in a slot
        childNodes = Array.from(node.childNodes);
 
        children.push(...childNodes);
    }
 
    return children;
}
 
export default function getAllChildren(node: Node): Node[] {
 
    const children: Node[] = [node];
 
    getChildren(node).forEach((child: Node) => {
 
        children.push(...getAllChildren(child));
    });
 
    return children;
}