woltage/dist/src/read/sideEffect.js

A CQRS and Event-Sourcing Framework

import { projectionStorage } from "../localStorages.js";
export default function sideEffect(fn) {
    return async (arg) => {
        const store = projectionStorage.getStore();
        if (store?.isReplaying === false)
            await fn(arg);
        else if (store === undefined)
            console.trace(`Invalid side effect execution "${fn.toString()}".`, 'Executing side effects is only possible from event handlers in projections.');
        return Promise.resolve();
    };
}