Let's say that a developer has created a general-purpose Dart library, aimed at the client, that contains a large number of class and functionality definitions, of which only a small subset is ever expected to be used in a single web page.
When we transpile Dart to JS, however, the output is a single, large JS file that appears to contain the functionality of any dependencies along with the behaviour desired for the particular page. If we had hundreds of pages, each linked to their own dart2js-produced JS file, we appear to have a tremendous amount of redundancy in the code. Further, if we need to make a change to the general-purpose library, it seems that we would have to regenerate the JS for each of the pages. (Or maybe I completely misunderstand things.)
My question is: is it possible to transpile Dart code to multiple JS files? For example, Dart code for a given page might be transpiled into one JS file containing the dependency functionality (that many pages can link to) and one small JS file defining the behaviour particular to the page?
Sounds like you should rethink your website as a single-page app. Then, you get a payload that can process any of your pages, but is still tree-shaken to have only exactly what you need for all of them.