Oh CommonJS! Why are you mESMing with me?

Typescript is almost everywhere. It’s so established that we use the ESM syntax subconsciously. Even though we might think it’s safe to use Typescript, we must remember that the browser and NodeJS server don’t understand TS out of the box, especially for library maintainers. That is why we use bundlers. But what if their output is different from what we expected? Should we care and trust still? I came into a situation where CommonJS and ESM messed with me. I will also share my thoughts on the interoperability challenges between packages and how to overcome them.