localization retains copyright in minimized main.js

[sdavids]

🐞 bug report

Affected Package

@angular/localize

Description

When using @angular/localize the Google license will not be removed (extracted) from main.js

🔬 Minimal Reproduction

$ ng n localized --defaults
$ cd localized
$ ng add @angular/localize
$ ng build --prod --localize
$ cat dist/localized/en-US/main-es2015.somehash.js | head -n 9
var $localize=Object.assign(void 0===$localize?{}:$localize,{locale:"en-US"});
/**
 * @license
 * Copyright Google Inc. All Rights Reserved.
 *
 * Use of this source code is governed by an MIT-style license that can be
 * found in the LICENSE file at https://angular.io/license
 */
!function(n) ......

🌍 Your Environment

Angular Version:

Angular CLI: 9.1.1
Node: 13.13.0
OS: darwin x64

Angular: 9.1.2
... animations, common, compiler, compiler-cli, core, forms
... language-service, localize, platform-browser
... platform-browser-dynamic, router, service-worker
Ivy Workspace: Yes

Package                           Version
-----------------------------------------------------------
@angular-devkit/architect         0.901.1
@angular-devkit/build-angular     0.901.1
@angular-devkit/build-optimizer   0.901.1
@angular-devkit/build-webpack     0.901.1
@angular-devkit/core              9.1.1
@angular-devkit/schematics        9.1.1
@angular/cli                      9.1.1
@ngtools/webpack                  9.1.1
@schematics/angular               9.1.1
@schematics/update                0.901.1
rxjs                              6.5.5
typescript                        3.8.3
webpack                           4.42.0

@angular/localize 9.1.2

angular.json

{
  "projects": {
    "localized-pwa": {
      "architect": {
        "build": {
          "builder": "@angular-devkit/build-angular:browser",
          "options": {
            "polyfills": "src/polyfills.ts",
            "aot": true,
...
          },
          "configurations": {
            "production": {
              "optimization": true,
              "outputHashing": "all",
              "extractCss": true,
              "namedChunks": false,
              "extractLicenses": true,
              "vendorChunk": false,
              "buildOptimizer": true,
...
            }
          }
        }
      }
...
    }},
}

[petebacondarwin]

This is due to the localization process including the global locale data file (e.g. https://github.com/angular/angular/blob/master/packages/common/locales/global/de.js).

It seems that the minification that is being applied to this file (perhaps before or after it is added to main.js) is not stripping the copyright comment (although the other comment is being stripped).

We recently also had an issue that these global locale data files were not being downleveled to ES5 when main.js needed to be ES5.

Perhaps we need to look at how the CLI is adding (and processing) these files. Transferring to the CLI project.