benchmark.js

let root, nodes, layout, i;
for (i = 0; i < 10; i++) {
    console.time('D3');
    root = d3.hierarchy({children: children.map(node=>node.toSmall())})
        .sum(node => node.value);

    layout = d3.pack()
        .size([d.width, d.width])
        .padding(1.5);

    nodes = layout(root).leaves()
    nodes.forEach(node => delete node.parent);
    console.timeEnd('D3');
}

for (i = 0; i < 10; i++) {
    console.time('WASM');

    root = new Module.Hierarchy({
        size: [d.width, d.width],
        padding: 1.5
    }, { value: 0, children: children.map(node => node.toSmall())});

    nodes = root.pack().leaves();
    console.timeEnd('WASM');
}