@tanstack/virtual-core/dist/esm/lazy-measurements.js

Headless UI for virtualizing scrollable elements in TS/JS + Frameworks

function createLazyMeasurementsView(count, flat, getItemKey) {
  const cache = new Array(count);
  return new Proxy(cache, {
    get(target, prop, receiver) {
      if (typeof prop === "string") {
        const c = prop.charCodeAt(0);
        if (c >= 48 && c <= 57) {
          const i = +prop;
          if (Number.isInteger(i) && i >= 0 && i < count) {
            let v = target[i];
            if (!v) {
              const s = flat[i * 2];
              v = target[i] = {
                index: i,
                key: getItemKey(i),
                start: s,
                size: flat[i * 2 + 1],
                end: s + flat[i * 2 + 1],
                lane: 0
              };
            }
            return v;
          }
        }
        if (prop === "length") return count;
      }
      return Reflect.get(target, prop, receiver);
    }
  });
}
export {
  createLazyMeasurementsView
};
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