mediatr-ts/lib/esm/attributes/requestHandler.attribute.js

Mimic the famous MediatR csharp library see: (https://github.com/jbogard/MediatR)

import { typeMappings } from "../models/mappings/index.js";
/**
 * Decorate the requestHandler with this attribute
 *
 * @param value The request type
 */
var requestHandler = function (value) {
    return function (target) {
        var existingTypeMappings = typeMappings.requestHandlers.getAll().filter(function (x) { return x.requestClass === value; });
        if (existingTypeMappings.length > 0) {
            throw new Error("Request handler for ".concat(value.name, " has been defined twice. Make sure you only have one @requestHandler decorator for each request type."));
        }
        typeMappings.requestHandlers.add({
            requestClass: value,
            handlerClass: target
        });
    };
};
export default requestHandler;
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