I found a recursive expression in a library very confused. The code is here : https://github.com/tappleby/redux-batched-subscribe/blob/master/src/index.js#L22
export function batchedSubscribe(batch) {
if (typeof batch !== 'function') {
throw new Error('Expected batch to be a function.');
}
const listeners = [];
function subscribe(listener) {
listeners.push(listener);
return function unsubscribe() {
const index = listeners.indexOf(listener);
listeners.splice(index, 1);
};
}
function notifyListenersBatched() {
batch(() => listeners.slice().forEach(listener => listener()));
}
return next => (...args) => {
const store = next(...args);
const subscribeImmediate = store.subscribe;
function dispatch(...dispatchArgs) {
const res = store.dispatch(...dispatchArgs);
notifyListenersBatched();
return res;
}
return {
...store,
dispatch,
subscribe,
subscribeImmediate
};
};
}
Specifically this part:
return next => (...args) => {
const store = next(...args);
const subscribeImmediate = store.subscribe;
function dispatch(...dispatchArgs) {
const res = store.dispatch(...dispatchArgs);
notifyListenersBatched();
return res;
}
return {
...store,
dispatch,
subscribe,
subscribeImmediate
};
};
How is this not infinite recursion?