woltage/dist/src/EventCaster.js

A CQRS and Event-Sourcing Framework

import eventMap from "./eventMap.js";
class EventCaster {
    static async cast(event, targetVersion) {
        event = new event.constructor(event, false);
        const eventType = event.type;
        const eventVersion = event.version;
        if (eventVersion === targetVersion)
            return event;
        if (!eventMap[eventType]?.[eventVersion] || !eventMap[eventType]?.[targetVersion]) {
            throw new Error(`Event casting from '${eventType}@${eventVersion}' to '${eventType}@${targetVersion}' failed because eventMap is not up to date.`);
        }
        const direction = targetVersion - eventVersion < 0 ? -1 : 1;
        for (let v = eventVersion + direction; v !== targetVersion + direction; v += direction) {
        }
        return event;
    }
    static isCastable() {
    }
}
EventCaster.CASTING_DIRECTIONS = Object.freeze({
    UP: 'up',
    DOWN: 'down',
});
EventCaster.CASTING_ERRORS = Object.freeze({
    KEY_MISSING: 'Key missing',
    TYPE_CHANGED: 'Type changed',
});
export default EventCaster;