redux-saga-problem.js

import api from './path/to/api'
import { take } from 'redux-saga'

function* watchSave() {
  while(true) {
    const { data } = yield take('SAVE_DATA');
  
    // Just naive example that callbacks do not propagate yield*
    yield* data
      .forEach(function*(record) {
        yield api.save(record)
      }); // this may be some non-trivial non-generator friendly function
  }
}

Not sure to understand why do you have to dispatch an observable to the store

Shouldn't you rather listen to the observable from the outside and dispatch incoming occurrences to the store

data.forEach(ev => dispatch(ev))

function* watchSave() {
  while(true) {
    const { record } = yield take('SAVE_DATA_RECORD');
    yield fork(saveData, record)
  }
}

yield data.forEach(function*(record) {
        yield api.save(record)
      }); 

why not using map instead???

@slorber we've been discussing this with @yelouafi on twitter. You guys probably missed my pain point and it's the fact that you simply can't use HoF with generators. Of course, I am aware that it can be mapped over but this is a trivial use case - there'r many use cases when you simply have a lot of code implemented which heavily relies on callbacks - and this can't be used because callbacks do not propagate yield* automatically.