@thi.ng/transducers-async/raf.js

Async versions of various highly composable transducers, reducers and iterators

import { source } from "./source.js";
const raf = (opts) => {
  let frame = 0;
  let t0 = opts?.t0 || 0;
  let isClosed = false;
  const gen = source();
  gen.close = () => {
    isClosed = true;
    gen.write(void 0);
  };
  const update = (t) => {
    if (isClosed) return;
    if (opts?.timestamp) {
      if (t0 === true) t0 = t;
      if (t0) t -= t0;
    } else {
      t = frame++;
    }
    gen.write(t);
    requestAnimationFrame(update);
  };
  requestAnimationFrame(update);
  return gen;
};
export {
  raf
};