nestjs-event-sourcing-lib/dist/core/event.js

A comprehensive Event Sourcing and CQRS library for NestJS applications

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.Event = void 0;
const uuid_1 = require("uuid");
/**
 * Base class for all events in Event Sourcing system
 */
class Event {
    constructor(aggregateId, payload, version = 1) {
        this.id = (0, uuid_1.v4)();
        this.aggregateId = aggregateId;
        this.eventType = this.constructor.name;
        this.timestamp = new Date();
        this.version = version;
        if (payload) {
            Object.assign(this, payload);
        }
    }
    /**
     * Serializes event to JSON
     */
    toJSON() {
        return {
            id: this.id,
            aggregateId: this.aggregateId,
            eventType: this.eventType,
            timestamp: this.timestamp,
            version: this.version,
            ...this.getPayload(),
        };
    }
    /**
     * Gets event payload (all properties except metadata)
     */
    getPayload() {
        const { id, aggregateId, eventType, timestamp, version, ...payload } = this;
        return payload;
    }
    /**
     * Creates event instance from JSON
     */
    static fromJSON(json) {
        const { id, aggregateId, eventType, timestamp, version, ...payload } = json;
        const event = Object.create(this.prototype);
        event.id = id;
        event.aggregateId = aggregateId;
        event.eventType = eventType;
        event.timestamp = new Date(timestamp);
        event.version = version;
        Object.assign(event, payload);
        return event;
    }
}
exports.Event = Event;
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