problems with chord.js in a non-observable environment

[Nor-Sch]

The function range line 3-5 in chord.js does not work in a non-observable environment. It gives an array of "undefined" values.

Solution:

function range(i,j) { return [...Array(j-i).keys()].flatMap(j=>j+i) }

In line 100 of chord.js empty chords should be removed by chords = Object.values(chords);
But this also leaves e.g. "functions" in chords and breaks the compareValue function in lines 7-14

Solution:

chords = chords.filter(Object);

[mbostock]

Nothing in d3-chord (or any D3 library) requires Observable. Here is an example in JSFiddle that demonstrates that the range function works as intended:

https://jsfiddle.net/yvng1h0o/1/