Thanks for reporting. It's fixed. Regards, suic

Ruby translation

Thanks a bunch! Being able to see the issue made it possible to actually resolve the problem.

Updated the tests to use chai.

Change testing suite to use chai so the error message in Node 10 is meaningful

const chai = require("chai");
const assert = chai.assert;
chai.config.truncateThreshold = 0;

describe("Sample tests", function() {
  it("Tests", function() {
    assert.deepEqual(interleave([1, 2, 3], ["c", "d", "e"]), [1, "c", 2, "d", 3, "e"]);
    ...

Specially in random tests where arrays are bigger.

Try a lower version of Node until the issue above is fixed.