Option to use ES2015 Flat ESM format with Angular 4+

[cyrilletuzi]

Angular 4.0.0-rc.1 changelog :

ES2015 Builds

We now also ship our packages in the ES2015 Flat ESM format. This option is experimental and opt-in (configure your webpack to resolve "es2015" property in package.json over the regular "module" property).

Is it possible to add an option to use this new format in --ng4 projects ?

I'm impressed by @angular/cli rc.0, my only concern is the bundles sizes. With the same app, and manual (but very simple) config of a packager, vendor + main was 1,0Mo with rollup and 1,2Mo with webpack 2 / @ngtools/webpack AotPlugin. With @angular/cli (prod mode), it's 1,5Mo...

Is at least classic tree shaking with module: "es2015" activated by default ?

Would like to help/test, but I don't know where the webpack config is managed in this project.

[filipesilva]

I was looking into this yesterday and there wasn't much improvement actually. It stems from webpack not actually doing tree shaking (#2901). It's one of the next big action items for webpack so we're waiting for that.

[cyrilletuzi]

OK, thanks.

Is there a reason to the current 0,3Mo surplus with @angular/cli ? I was using manually AotPlugin of @ngtools/webpack, like @angular/cli, so I don't understand such an important difference.

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