Direct template loading in AngularWebpackPlugin results in empty component templates
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Descrição
### Command
build
### Is this a regression?
- [x] Yes, this behavior used to work in the previous version
### The previous version in which this bug was not present was
18.3.0
### Description
A bugfix in webpack 5.96.0 has broken direct template loading.
https://github.com/webpack/webpack/issues/19235#issuecomment-2688250063
When using webpack 5.96.0 or higher, if you set the `directTemplateLoading` option to false in the `AngularWebpackPlugin`, component templates end up being empty.
Note: I've said that this is a regression even though technically nothing in the Angular CLI has changed, however if you are updating the Angular CLI regularly, you are probably also updating webpack regularly, so you will encounter this bug.
### Minimal Reproduction
Start with this repository: https://github.com/reduckted/repro-webpack-template
This is the setup:
- Contains `AppComponent` that has a template with the content "hello world".
- A custom Angular builder is used to modify the webpack configuration and set `AngularWebpackPlugin.options.directTemplateLoading` to false.
- A custom loader is to the webpack configuration that replaces all occurrences of "world" with "you" in HTML files.
When this works, the `AppComponent`'s template will end up containing "hello you".
Start by cloning the repository:
```
git clone https://github.com/reduckted/repro-webpack-template.git
cd repro-webpack-template
```
Switch to the `ng-webpack595` branch (this uses webpack@5.95.0). and build:
```
git checkout ng-webpack595
npm i
npm run build
```
Open `dist/repro-webpack-template/main.js` and search for "AppComponent_Template". You will see that it looks like this:
```js
template: function AppComponent_Template(rf, ctx) {
if (rf & 1) {
_angular_core__WEBPACK_IMPORTED_MODULE_0__["ɵɵtext"](0, "hello you\n");
}
},
```
This works correctly and has replaced "world" with "you".
Now switch to the `ng-webpack598` branch (this uses webpack@5.98.0). and build:
```
git checkout ng-webpack598
npm i
npm run build
```
Open `dist/repro-webpack-template/main.js` again and search for "AppComponent_Template". You will see that it looks like this:
```js
template: function AppComponent_Template(rf, ctx) {},
```
The template is completely empty.
### Exception or Error
```text
```
### Your Environment
```text
_ _ ____ _ ___
/ \ _ __ __ _ _ _| | __ _ _ __ / ___| | |_ _|
/ △ \ | '_ \ / _` | | | | |/ _` | '__| | | | | | |
/ ___ \| | | | (_| | |_| | | (_| | | | |___| |___ | |
/_/ \_\_| |_|\__, |\__,_|_|\__,_|_| \____|_____|___|
|___/
Angular CLI: 19.2.0
Node: 22.13.1
Package Manager: npm 11.1.0
OS: win32 x64
Angular: 19.2.0
... animations, cli, common, compiler, compiler-cli, core, forms
... platform-browser, platform-browser-dynamic, router
Package Version
---------------------------------------------------------
@angular-devkit/architect 0.1902.0
@angular-devkit/build-angular 19.2.0
@angular-devkit/core 19.2.0
@angular-devkit/schematics 19.2.0
@ngtools/webpack 19.2.0
@schematics/angular 19.2.0
rxjs 7.8.2
typescript 5.7.3
zone.js 0.15.0
```
### Anything else relevant?
As @alexander-akait says here: https://github.com/webpack/webpack/issues/19235#issuecomment-2688250063
> it was a bug fix in 5.96.0 and unfortunately your code relied on buggy behavior.
Thankfully, the fix is really simple, and @alexander-akait even provided an example of how to fix it. :heart:
This:
https://github.com/angular/angular-cli/blob/cb078c276861ce6fb6aaebc589b3c44fcb854c38/packages/ngtools/webpack/src/resource_loader.ts#L129
Needs to change to:
```ts
return `data:application/javascript,export { default } from "${filePath}?${NG_COMPONENT_RESOURCE_QUERY}";`;
```
Guia de contribuição
Direção de pesquisa
Comece em packages/ngtools/webpack/src/resource_loader.ts, na lógica de carregamento de recursos vinculada no relatório, e depois reproduza o comportamento usando as branches ng-webpack595 e ng-webpack598. Verifique a saída do build com directTemplateLoading=false inspecionando AppComponent_Template em dist/repro-webpack-template/main.js. Está concluído quando o template processado não estiver mais vazio e ainda contiver o conteúdo transformado "hello you".
Escrita pelo modelo de indexação a partir do texto da issue.
Avaliação
- Stack de tecnologia
- angular, typescript, webpack
- Domínio
- build-system
- Tipo de issue
- Bug
- Dificuldade
- 2/5
- Tempo estimado
- 1-3 horas
- Status de atividade
- Estagnada
- Clareza
- Claramente especificada
- Facilidade para iniciantes
- 52/100