lbry-desktop/src/renderer/util/redux-utils.js

// util for creating reducers
// based off of redux-actions
// https://redux-actions.js.org/docs/api/handleAction.html#handleactions
const handleActions = (actionMap, defaultState) => (state = defaultState, action) => {
  const handler = actionMap[action.type];

  if (handler) {
    const newState = handler(state, action);
    return Object.assign({}, state, newState);
  }

  // just return the original state if no handler
  // returning a copy here breaks redux-persist
  return state;
};

export { handleActions as default };