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Showing content from https://docs.dhtmlx.com/suite/tree/api/tree_template_config/ below:

JavaScript Tree - template Config

Optional. Specifies a template for Tree items

The template function takes two parameters:

• item - an object of a Tree item
• isFolder - defines whether an item is a folder

and returns either a string or null.

Tip. The callback function together with the isFolder parameter allows you to specify a template for child items only.

const tree = new dhx.Tree("tree_container", {
    template: ({ value }, isFolder) => {
        const template = `
            <div className="dhx_tree_template">
                <span className="dhx_tree_template__value">${value}</span>
                <div className="dhx_tree_template__rows">
                    <button className="dhx_tree_template__button remove">
                        <i className="far fa-trash-alt dhx_tree_template__icon dhx_tree_template__icon--danger"></i>
                    </button>
                </div>
            </div>
        `
        return isFolder ? null : template;
    }
});

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