hy-push-state/src/mixin/operators.js

Turn static web sites into dynamic web apps

// # src / mixin / operators.js
// Copyright (c) 2018 Florian Klampfer <https://qwtel.com/>
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

import { NEVER } from "rxjs/_esm5";

import { switchMap } from "rxjs/_esm5/operators";

// ### Observable extensions
// #### Unsubscribe when
// This operator unsubscribes from the source observable when `pauser$` emits a truthy value,
// and re-subscribes when it emits a falsy value.
export const unsubscribeWhen = pauser$ => source => {
  if (process.env.DEBUG && !pauser$) throw Error();
  return pauser$.pipe(switchMap(paused => (paused ? NEVER : source)));
};

// #### Custom subscribe
// A custom subscribe function that will `recover` from an error and log it to the console.
// This is a line of last defense to make sure the entire pipeline/page doesn't crash.
/*
function subscribe(ne, er, co) {
  let res = this;
  if (process.env.DEBUG) res = this.pipe(tap({ error: e => console.error(e) }));
  return res
    .pipe(catchError((e, c) => c))
    .subscribe(ne, er, co);
}
*/