@thi.ng/rstream/promise.js

Reactive streams & subscription primitives for constructing dataflow graphs / pipelines

import { State } from "./api.js";
import { __optsWithID } from "./idgen.js";
import { stream } from "./stream.js";
const fromPromise = (src, opts) => {
  let canceled = false;
  let isError = false;
  let err = {};
  src.catch((e) => {
    err = e;
    isError = true;
  });
  return stream((stream2) => {
    src.then(
      (x) => {
        if (!canceled && stream2.getState() < State.DONE) {
          if (isError) {
            stream2.error(err);
            err = null;
          } else {
            stream2.next(x);
            stream2.closeIn !== "never" && stream2.done();
          }
        }
      },
      (e) => stream2.error(e)
    );
    return () => {
      canceled = true;
    };
  }, __optsWithID("promise", opts));
};
export {
  fromPromise
};