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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 | import { Dispatch, Middleware } from "@reduxjs/toolkit";
import { RootState } from "store/configureStore";
import throttle from "lodash/throttle";
import { DebouncedFunc } from "lodash";
type ThrottleableAction = {
type: string;
meta: {
throttle: number;
key: string;
};
};
const isThrottleableAction = (
action: unknown,
): action is ThrottleableAction => {
Iif (typeof action !== "object" || action === null) return false;
const actionWithMeta = action as { meta?: unknown };
Iif (typeof actionWithMeta.meta !== "object" || actionWithMeta.meta === null) {
return false;
}
const metaWithThrottle = actionWithMeta.meta as {
throttle?: unknown;
key?: unknown;
};
return (
typeof metaWithThrottle.throttle === "number" &&
typeof metaWithThrottle.key === "string"
);
};
const throttled: Record<
string,
DebouncedFunc<Dispatch<ThrottleableAction>>
> = {};
const throttleMiddleware: Middleware<Dispatch, RootState> =
(_store) => (next) => async (action) => {
Iif (!isThrottleableAction(action)) {
return next(action);
}
const time = (action.meta && action.meta.throttle) as number | undefined;
Iif (!time) return next(action);
const key = `${action.type}_${action.meta.key}`;
const previousCall = throttled[key];
Iif (previousCall) {
return previousCall(action);
}
const newCall = throttle(next, time, {
leading: true,
trailing: true,
}) as DebouncedFunc<Dispatch<ThrottleableAction>>;
throttled[key] = newCall;
return newCall(action);
};
export default throttleMiddleware;
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