Fastify's _patchConstructor causing errorCodes to be inaccessible

[paskahlisanjas]

opentelemetry-js-contrib/plugins/node/opentelemetry-instrumentation-fastify/src/instrumentation.ts

Lines 203 to 222 in 9df30ea

	private _patchConstructor(moduleExports: {
	fastify: () => FastifyInstance;
	}): () => FastifyInstance {
	const instrumentation = this;
	this._diag.debug('Patching fastify constructor function');
	function fastify(this: FastifyInstance, ...args: any) {
	const app: FastifyInstance = moduleExports.fastify.apply(this, args);
	app.addHook('onRequest', instrumentation._hookOnRequest());
	app.addHook('preHandler', instrumentation._hookPreHandler());
	instrumentation._wrap(app, 'addHook', instrumentation._wrapAddHook());
	return app;
	}
	fastify.fastify = fastify;
	fastify.default = fastify;
	return fastify;
	}

This overrides the originally exported fastify while it should contain errorCodes as assigned here. This breaks whenever I try to do this:

import { errorCodes } from 'fastify';

The errorCodes is always undefined.

Is there any workaround for this?