@lifaon/rx-js-light/src/misc/subscription/create-subscription.mjs

Blazing fast Observables

import {freeze} from "../helpers/freeze.mjs";
export function createSubscription(subscribe, emit) {
  let unsubscribe = null;
  const isActivated = () => {
    return unsubscribe !== null;
  };
  const activate = () => {
    if (unsubscribe === null) {
      unsubscribe = subscribe(emit);
    }
    return subscription;
  };
  const deactivate = () => {
    if (unsubscribe !== null) {
      unsubscribe();
      unsubscribe = null;
    }
    return subscription;
  };
  const toggle = (_activate = !isActivated()) => {
    if (_activate) {
      return activate();
    } else {
      return deactivate();
    }
  };
  const subscription = freeze({
    subscribe,
    emit,
    isActivated,
    activate,
    deactivate,
    toggle
  });
  return subscription;
}