I can now answer my own question from July 25. After completing my site with the standard build, I saved off a /dist production build, and then followed these directions to the letter. A couple of notes: 1) My
@fortawesome install was somehow removed. This is the Angular add-on for font-awesome. The “fort” part is, I believe, an intentional misspelling, but it’s from the same team. After some inconclusive digging around, I re-installed @fortawesome and it fixed that issue. 2) I noticed some previously undetected bugs in Microsoft Edge — apparently, this change modifies the timing of some modules loading. I put in some tests for if(thisVar==undefined), and it seemed to clear that issue up. Finally, I compared the compiled /dist folder content. main.js grew by 25KB, polyfills grew by 90KB. Two other files changed by a small 1KB each. All in all, these are relatively small increases that open up a broader user market. Thanks for the great write-up!