asciitree.ts

function toAsciiTree(tree: any, prefix = "", isTail = true): string | null {
    if (!tree) {
        return null
    }

    let children = tree.children || []
    return [prefix, isTail ? "└" : "├", " ", tree.name, '\n']
        .concat(children.map((c: any, i: number) => toAsciiTree(c,
            prefix + (isTail ? "  " : "│ "), i >= children.length - 1)))
        .join('')
}