redux-observable-es6-compat/src/combineEpics.js

This is build from redux-observable (https://github.com/redux-observable/redux-observable) but fix errors in es2015

import { merge } from 'rxjs';

/**
  Merges all epics into a single one.
 */
export const combineEpics = (...epics) => {
  const merger = (...args) => merge(
    ...epics.map(epic => {
      const output$ = epic(...args);
      if (!output$) {
        throw new TypeError(`combineEpics: one of the provided Epics "${epic.name || '<anonymous>'}" does not return a stream. Double check you\'re not missing a return statement!`);
      }
      return output$;
    })
  );

  // Technically the `name` property on Function's are supposed to be read-only.
  // While some JS runtimes allow it anyway (so this is useful in debugging)
  // some actually throw an exception when you attempt to do so.
  try {
    Object.defineProperty(merger, 'name', {
      value: `combineEpics(${epics.map(epic => epic.name || '<anonymous>').join(', ')})`,
    });
  } catch (e) {}

  return merger;
};