Importing locales can cause optimization bailouts

[snebjorn]

🐞 bug report

Affected Package

The issue is caused by package @angular/common/locales

Is this a regression?

Yes, the previous version in which this bug was not present was: 9.1.11

Description

Importing a locale for use with registerLocaleData causes angular 10 to complain:

CommonJS or AMD dependencies can cause optimization bailouts.
For more info see: https://angular.io/guide/build#configuring-commonjs-dependencies

🔬 Minimal Reproduction

// app.module.ts
import locale from '@angular/common/locales/da';

Run: ng serve

🌍 Your Environment

Angular Version:

Angular CLI: 10.0.1
Node: 12.16.1
OS: win32 x64

Angular: 10.0.3
... animations, common, compiler, compiler-cli, core, forms
... language-service, localize, platform-browser
... platform-browser-dynamic, router
Ivy Workspace: Yes

Package                           Version
-----------------------------------------------------------
@angular-devkit/architect         0.901.1
@angular-devkit/build-angular     0.1000.1
@angular-devkit/build-optimizer   0.1000.1
@angular-devkit/build-webpack     0.1000.1
@angular-devkit/core              9.1.1
@angular-devkit/schematics        10.0.1
@angular/cdk                      9.2.4
@angular/cli                      10.0.1
@ngtools/webpack                  10.0.1
@schematics/angular               10.0.1
@schematics/update                0.1000.1
rxjs                              6.6.0
typescript                        3.9.6
webpack                           4.43.0

Anything else relevant?
Switching to @angular/localize and adding

// angular.json
{
  ...,
  "projects": {
    ...,
    "i18n": { "sourceLocale": "da" }, // added
    "architect": {
        "build": {
          "options": {
            ...,
            "localize": true, // added

removes the warning.
But is overkill and causes the compile out dir to change, breaking the CI scripts etc...

[destus90]

With CLI version 10.0.2 the warning should not be displayed, due to #18134

[alan-agius4]

Duplicate of #18123

[angular-automatic-lock-bot]

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