async function createStreamVisualizer(asyncIterable, { maxPoints, alpha, width, height, yDomain }) {
  const { scaleLinear, line } = await import("https://cdn.jsdelivr.net/npm/d3@7/+esm");
  const data = [];
  let ema;

  for await (const { timestamp, value } of asyncIterable) {
    ema = data.length ? alpha * value + (1 - alpha) * ema : value;
    data.push({ timestamp, value, ema });
    if (data.length > maxPoints) data.shift();
  }

  if (!data.length) return { data, path: "" };

  const x = scaleLinear()
    .domain([data[0].timestamp, data.at(-1).timestamp])
    .range([0, width]);
  const y = scaleLinear().domain(yDomain).range([height, 0]);

  const path = line()
    .x(d => x(d.timestamp))
    .y(d => y(d.ema))(data);

  return { data, path };
}
export default createStreamVisualizer;
// Generation time: 48.702s
// Result: PASS