eventual-reader.js

const makeNearReader = reader =>
  Far('Reader', {
    async next() {
      const iteration = await reader.next();
      if (iteration.done) {
        return iteration;
      }
      return harden({ value: encodeBase64(iteration.value) });
    },
    async return(value) {
      return reader.return(value);
    },
    async throw(error) {
      return reader.throw(error);
    },
  });

const makeFarReader = readerPresence => ({
  async next(value) {
    const result = await E(readerPresence).next(value);
    if (result.done) {
      return result;
    }
    return harden({ value: decodeBase64(result.value) });
  },
  async return(value) {
    return E(readerPresence).return(value);
  },
  async throw(value) {
    return E(readerPresence).throw(value);
  },
  [Symbol.asyncIterator]() {
    return this;
  },
});