Can't apply custom loader for component's 'templateUrl' since version 8

🐞 Bug report

Command (mark with an x)

- [ ] new
- [x ] build
- [x ] 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: ^7

Description

In previous versions there was an error if you tried to use any unsupported filetype for templateUrl

ERROR in Module parse failed: Unexpected token (2:55)
You may need an appropriate loader to handle this file type.

Since .svg is supported there are no error, but the file is simply loaded with raw-loader

🔬 Minimal Reproduction

Create a new project with Angular: 8.0.0-rc.5 Try to use ng-cli-pug-loader or custom-webpack builder for .pug loading.

🌍 Your Environment

Angular CLI: 8.0.0-rc.4
Node: 12.3.1
OS: win32 x64
Angular: 8.0.0-rc.5
... animations, common, compiler, compiler-cli, core, forms
... language-service, platform-browser, platform-browser-dynamic
... router

Package                           Version
-----------------------------------------------------------
@angular-devkit/architect         0.800.0-rc.4
@angular-devkit/build-angular     0.800.0-rc.4
@angular-devkit/build-optimizer   0.800.0-rc.4
@angular-devkit/build-webpack     0.800.0-rc.4
@angular-devkit/core              8.0.0-rc.4
@angular-devkit/schematics        8.0.0-rc.4
@angular/cli                      8.0.0-rc.4
@ngtools/webpack                  8.0.0-rc.4
@schematics/angular               8.0.0-rc.4
@schematics/update                0.800.0-rc.4
rxjs                              6.4.0
typescript                        3.4.5
webpack                           4.30.0

Anything else relevant? The issue is present since .svg component template is supported - https://github.com/angular/angular-cli/commit/dfb08b95b73f3e75d0f2cd0c61f336dc86d0769a

#https://github.com/danguilherme/ng-cli-pug-loader/issues/20

[MateEke]

Almost all property of AngularCompilerPlugin is editable trough tsconfig or angular.json. I think directTemplateLoading should be configurable too. The above method seems like a dirty hack.

There are lot of feature request for PUG/JADE support. Since 2016 we got promises for native support https://github.com/angular/angular-cli/issues/40 (PR not merged) or trough addon system https://github.com/angular/angular-cli/issues/1886

Now in Angular 8 it’s even more difficult…

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