in backends/sentry.js [32:46]
function SentryBackend(opts) {
if (!(this instanceof SentryBackend)) {
return new SentryBackend(opts);
}
if (!opts.dsn) {
throw new Error('SentryBackend: opts.dsn is required');
}
EventEmitter.call(this);
this.dsn = opts.dsn;
this.defaultTags = opts.defaultTags || {};
this.statsd = opts.statsd || null;
}