async function createStreamVisualizer(asyncIterable, options) {
  const { maxPoints, alpha, width, height, yDomain } = options;
  const d3 = 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 = d3.scaleLinear()
    .domain([data[0].timestamp, data[data.length - 1].timestamp])
    .range([0, width]);

  const y = d3.scaleLinear()
    .domain(yDomain)
    .range([height, 0]);

  const path = d3.line()
    .x(d => x(d.timestamp))
    .y(d => y(d.ema))(data) ?? "";

  return { data, path };
}
export default createStreamVisualizer;
// Generation time: 6.848s
// Result: PASS