UglifyJs => Terser

[kesselb]

Description:

angular/angular-cli#5775 (comment)

Build could be faster when terser (https://www.npmjs.com/package/terser) is used instead of uglify-js.

Uglify-Js

Terser

Improvements

• Faster build

[kesselb]

Uglify-Js

Terser

When build without sourcemaps there is no big difference but the build with sourcemaps should be faster.

[PatrickSkowronek]

Due to this answer angular/angular-cli#5775 (comment) terser will be standard with angular 7. Why not upgrade angular to version 7?

[kesselb]

Angular 7 is not on the roadmap (yet).

[PatrickSkowronek]

@danielkesselberg the upgrade should be not that problematic, like the update from 5->6

[kesselb]

How is this related to this pr? Yes teser is default for angular 7 but I try to reduce the build time a bit and not upgrade angular. We will discuss the angular upgrade at some point but there is no need to rush. Angular 6 is supported until Nov 2019.

[dboschm]

@PatrickSkowronek upgrade to angular 7 is a risky thing and should be done prudently. Until then (as @danielkesselberg said angular 6 is not outdated til Nov 19) we want to save build time, and using terser with angular 6 is a simple way to save about 12-15%.

[kesselb]

Just for the record. Build is not faster on travis with terser.

Uglify-Js

Terser