I developed a 500.000 line js front-end without a build step (only a minifier/bundler for production releases, nothing in dev). We did have an on-demand loader

I developed a 500.000 line js front-end without a build step (only a minifier/bundler for production releases, nothing in dev). We did have an on-demand loader to bring in modules as needed. It’s definitely doable though I do prefer to use typescript myself for large codebases.