injectDependecies.js

const injectMiddleware = (staticDeps, dynamicDeps) => ({ dispatch, getState }) => next => action => {
  const deps = {...staticDeps};
  Object.keys(dynamicDeps).forEach(key => {
    deps[key] = dynamicDeps[key]();
  });
  return next(typeof action === 'function'
      ? action({ ...deps, dispatch, getState })
      : action
    );
  }

store.js

const dependenciesMiddleware = injectDependencies(
  {api},
  {
    analytics: () => window.analytics
  }
);

const store = createStore(
  reducer,
  applyMiddleware(dependenciesMiddleware)
)

user.actions.js

function fetchUser(id) {
  return ({dispatch, getState, analytics, api}) => {
    api.fetchUser(id).then(user => {
      analytics().track(...);
    });
  }
}