Load modern ES bundle in modern browsers

It seems to be becoming fairly common practice to generate two versions of an application’s JavaScript bundle: one that retains most of the features and syntax of modern JavaScript, and a second that compiles down to pure ES5 for maximum compatibility. There’s a slightly hacky but ultimately quite simple way to make sure the right bundle flavor is loaded, by using <script type="module"> and nomodule respectively.

We should explore setting things up this way in Popcode. I think it would mostly be worth the extra complexity if the modern JS bundle were substantially smaller than the legacy bundle, so worth investigating that first.

まず issue とリンクされている module/nomodule のリファレンスを確認し、その後、Popcode が現在どのように JavaScript バンドルを生成して読み込んでいるかを調査します。モダン出力と ES5 出力のサイズおよびブラウザー互換性を比較します。利点が明確になり、具体的な実装方針が文書化または採用された時点で作業は完了です。