Bacon.js fetch wrapper with AbortController support

fetchBacon.js

import {fromBinder} from 'baconjs'

/**
 * Create a Bacon.js EventStream that fetches a resource specified by the fetch
 * parameters.
 *
 * If the EventStream loses all subscriptions while the underlying request is pending,
 * the request will be aborted using <code>AbortController</code>. NOTE: If
 * <code>init.signal</code> is provided, it will be ignored in favour of an internally
 * provided signal.
 */
function fetchBacon(input, init): EventStream {
    return fromBinder(sink => {
        const controller = new AbortController()

        fetch(url, {...init, signal: controller.signal})
            .then(res => sink(res.ok ? res : new Bacon.Error(res)))
            .catch(error => sink(new Bacon.Error(error)))
            .finally(() => sink(new Bacon.End()))

        return () => controller.abort()
    })
}