@data-client/core/lib/state/reducer/fetchReducer.js

Async State Management without the Management. REST, GraphQL, SSE, Websockets, Fetch

import { createOptimistic } from '../../controller/actions/createOptimistic.js';
export function fetchReducer(state, action) {
  if (action.endpoint.getOptimisticResponse && action.endpoint.sideEffect) {
    const setAction = createOptimistic(action.endpoint, action.args, action.meta.fetchedAt);
    return {
      ...state,
      optimistic: [...state.optimistic, setAction]
    };
  }
  return state;
}
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