如何在不同文件中的史诗之间共享变量？

Question

我在我的nextjs 网络应用程序中使用redux-observable。有一个变量必须在epic1 中设置，稍后在epic2 中访问：

let sharedVariable;

const epic1 = (action$, state$) => {
    return action$.pipe(
        // check if the dispatched action is of type action1
        filter(action1.match),
        tap((action) => {
            // create a new instance of A and assign
            // it to sharedVariable
            if (!sharedVariable) {
                sharedVariable = new A();
            }
        }),
        mergeMap((action) => {
            ...
        }),
    )
}

const epic2 = (action$, state$) => {
    return action$.pipe(
        // check if the dispatched action is of type action2
        filter(action2.match),
        map((action) => {
            if (sharedVariable) {
                return action3();
            } else {
                return action4();
            }
        }),
    )
}

我想将史诗放在不同的文件中：epics1.js & epics2.js

当史诗位于不同的文件中时，我应该如何让史诗设置和访问sharedVariable？

提前致谢！

Answer 1

听起来像是 DI 的好案例：docs

const sharedVariable = {} // can not be primitive type
const epicMiddleware = createEpicMiddleware({
  dependencies: { sharedVariable }
});

const epic2 = (action$, state$, { sharedVariable }) => {
 // Rest of code
}