Currently, Sentry supports 107 platforms through various SDKs that we proudly maintain, 13 of which are for JavaScript platforms. We frequently release new JavaScript SDK versions to add innovative features and important bug fixes and try to stay ahead of new frameworks and JavaScript runtimes. But how can we confidently ensure that the changes we release will perform flawlessly in an ever-changing JavaScript environment? Join me in this exciting talk where I unveil Verdaccio, a lightweight, open-source, private proxy registry that we are using to conduct seamless end-to-end testing of our SDK against multiple versions of frameworks, especially canary releases. We will delve into the details of our process for setting up Verdaccio, integrating it into our SDK testing, and providing examples of how it notified us of regressions in combination with new framework releases.