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I'm able to get the example from the readme working in two situations:

• Using nodejs, or
• Using a browser

However, when I try to call elkjs through e.g. pythonmonkey:

elkjs_bundled = Path("./node_modules/elkjs/lib/elk.bundled.js").read_text()
pm.eval(elkjs_bundled)
ELK = pm.new("ELK")
elk = ELK()
elk_graph = json.load(< example graph from readme >)
fut = elk.layout(elk_graph)
fut.add_done_callback(print)

I get the following error:

Uncaught TypeError: can't access property "max", $wnd.Math is undefined
    Wp@evaluate:4113:22
    Io@evaluate:4933:34
    IEd@evaluate:5079:38
    QId@evaluate:6210:61
    h/this.dispatch@evaluate:6523:476
    h/this.saveDispatch@evaluate:6523:603
    j/this.postMessage/<@evaluate:6524:162

Presumably this is related to the Java compile to JS using GWT, but the main thing here is that there is no window object with which to rely on.