esbuild is fast but it has a lot of place you have to figure out yourself and get into your way of doing thing.

1. dev server: you have to write a bit of code for this server to act as webpack dev server 2. scss: need to install plugin, and plugin cannot use from command line then you need to write a bit of JavaScript 3. global function: if you do `process.env` now you need to inject into build script 4. node package: if the package use node stuff you have to define thing like `fs/stream` into package.json

very quickly it get into your way of doing thing.

However, once you get past that base line, the cost is constant, the complexity just stop right there and not adding up.

Plus, the speed is amazing.