Sourcemap with prod build and differential loading does not work with update to 8.3.0

[james-criscuolo]

🐞 Bug report

Command (mark with an x)

- [ ] new
- [ X ] build
- [ ] serve
- [ ] test
- [ ] e2e
- [ ] generate
- [ ] add
- [ ] update
- [ ] lint
- [ ] xi18n
- [ ] run
- [ ] config
- [ ] help
- [ ] version
- [ ] doc

Is this a regression?

Yes, the previous version in which this bug was not present was: 8.2.2 (specifically @angular-devkit/build-angular 0.802.2)

Description

The sourcemap comment is missing from main-es2015..js when doing a production build with sourceMaps turned on. main-es5..js

🔬 Minimal Reproduction

🔥 Exception or Error

ng new myApp
//I dont think these options matter, but i turned on angular routing and chose scss
cd myApp
emacs angular.json
// only instance of "sourceMap" in the file must change from false to true
ng build myApp -c production
emacs dist/myApp/main-es2015.hash.js
// bottom of file has no sourcemap indicator
emacs dist/myApp/main-es5.hash.js
// bottom of file has the sourcemap indicator

🌍 Your Environment

 ~/newAngularApp   master ●  ng version

     _                      _                 ____ _     ___
    / \   _ __   __ _ _   _| | __ _ _ __     / ___| |   |_ _|
   / △ \ | '_ \ / _` | | | | |/ _` | '__|   | |   | |    | |
  / ___ \| | | | (_| | |_| | | (_| | |      | |___| |___ | |
 /_/   \_\_| |_|\__, |\__,_|_|\__,_|_|       \____|_____|___|
                |___/


Angular CLI: 8.3.0
Node: 10.16.0
OS: darwin x64
Angular: 8.2.3
... animations, common, compiler, compiler-cli, core, forms
... language-service, platform-browser, platform-browser-dynamic
... router

Package                           Version
-----------------------------------------------------------
@angular-devkit/architect         0.803.0
@angular-devkit/build-angular     0.803.0
@angular-devkit/build-optimizer   0.803.0
@angular-devkit/build-webpack     0.803.0
@angular-devkit/core              8.3.0
@angular-devkit/schematics        8.3.0
@angular/cli                      8.3.0
@ngtools/webpack                  8.3.0
@schematics/angular               8.3.0
@schematics/update                0.803.0
rxjs                              6.4.0
typescript                        3.5.3
webpack                           4.39.2

Anything else relevant?

[Splaktar]

I just ran into this as well using

Angular CLI: 9.0.0-next.0
Node: 12.3.0
OS: darwin x64
Angular: 9.0.0-next.3
... animations, common, compiler, compiler-cli, core, forms
... platform-browser, platform-browser-dynamic, router
... service-worker

Package                           Version
-----------------------------------------------------------
@angular-devkit/architect         0.900.0-next.0
@angular-devkit/build-angular     0.900.0-next.0
@angular-devkit/build-optimizer   0.900.0-next.0
@angular-devkit/build-webpack     0.900.0-next.0
@angular-devkit/core              9.0.0-next.0
@angular-devkit/schematics        9.0.0-next.0
@angular/cdk                      8.1.4
@angular/cli                      9.0.0-next.0
@angular/fire                     5.2.1
@angular/language-service         8.2.3
@angular/material                 8.1.4
@angular/pwa                      0.900.0-next.0
@ngtools/webpack                  9.0.0-next.0
@schematics/angular               9.0.0-next.0
@schematics/update                0.900.0-next.0
rxjs                              6.5.2
typescript                        3.5.3
webpack                           4.39.2

Manually adding the mapping myself enabled me to get a proper report from source-map-explorer.

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