feat(@angular-devkit/build-angular): use terser instead of uglify-es

[filipesilva]

Should help bring down prod build times, @SanderElias reported a ~60% reduction on his project.

Should fix #9340.

[kzc]

@filipesilva Terser has no known issues with the compress inline option with ES6+ code.

angular-cli/packages/angular_devkit/build_angular/src/angular-cli-files/models/webpack-configs/common.ts

Lines 232 to 234 in 8b7fa04

	// Workaround known uglify-es issue
	// See https://github.com/mishoo/UglifyJS2/issues/2949#issuecomment-368070307
	inline: wco.supportES2015 ? 1 : 3,

This code can probably be removed.

[filipesilva]

Thanks for the heads up @kzc, didn't remember that. Fix up at #12033

[kubbafox]

@filipesilva Hi Filipe, may I ask when your team will release a new version which includes this PR? Thanks a lot :)

[filipesilva]

@kubbafox this is now released in @angular-devkit/build-angular@0.9.0-beta.2.

[flash-me]

@filipesilva Is this an ng 7 only feature or can we expect to make use of it while remaining on ng 6.x? For. e. g. by just upgrading cli and/or the devkit packages?

[filipesilva]

@kqadem right now it should work, but I can't guarantee that'll be the case as we go out of beta since the interface between @angular-devkit/build-angular and the CLI might change.

[flash-me]

@filipesilva Wow, thx for the quick reply! Alright, let's see how it comes. Having a quite big enterprise product here going to be launched soon prohitibing us major version changes.

Since the change only involves switching a package, we might even consider kind of dirty mapping from uglify to terser... I mean, ~60% build time reduction 😱

[filipesilva]

Well that was for a specific project. I can't say that'll be the case for every project. Have you tried the beta on your app?

[flash-me]

I think I'm going to have a look at it by the end of the week.

Well that was for a specific project. I can't say that'll be the case for every project

yep, could be even more 😜

[cquixada]

We had the same problem involving uglify-es. Changing the version of "angular-devkit/build-angular" to "0.9.0-rc.3", even with Angular CLI 6.2.5, our application is running again with older versions of FF without needing "build-optimizer=false". Thanks.

[flash-me]

@cquixada did you notice any improvements regarding build time?

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