Honestly, if your day job hasn't forced you into using a bundler, I'd recommend avoiding it if you can. For modularity, I start with native ES modules. If thing

Honestly, if your day job hasn't forced you into using a bundler, I'd recommend avoiding it if you can. For modularity, I start with native ES modules. If things got complicated enough that I thought a bundler would offer me some sort of a benefit, I'd reach for rollup first.