@thi.ng/rstream/atom.js

Reactive streams & subscription primitives for constructing dataflow graphs / pipelines

import { __optsWithID } from "./idgen.js";
import { stream } from "./stream.js";
const fromAtom = (atom, opts) => {
  opts = __optsWithID("atom", {
    emitFirst: true,
    changed: (a, b) => a !== b,
    ...opts
  });
  return stream((stream2) => {
    atom.addWatch(stream2.id, (_, prev, curr) => {
      if (opts.changed(prev, curr)) {
        stream2.next(curr);
      }
    });
    opts.emitFirst && stream2.next(atom.deref());
    return () => atom.removeWatch(stream2.id);
  }, opts);
};
export {
  fromAtom
};