angular / angular/angular-cli

Bug: [ngtools] Replace resource transformer issue with conditional `templateUrl`

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area: @angular/build area: @ngtools/webpack freq1: low severity2: inconvenient type: bug/fix
主要语言
TypeScript
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描述

### Command

test

### Is this a regression?

- [ ] Yes, this behavior used to work in the previous version

### The previous version in which this bug was not present was

_No response_

### Description

When having conditional `templateUrl` like this
```
templateUrl:
true === true
? './dashboard.component.html'
: './dashboard.component.copy.html',
```

`replace_resources.ts` couldn't transform into proper codes (either `require` or `import`)

### Minimal Reproduction

- Run this test file https://github.com/ahnpnl/angular-cli/blob/bug/replace-resource/packages/ngtools/webpack/src/transformers/replace_resources_spec.ts
- Observe test failed
- Print out the output which would contain something like
```
// esm

//...
AppComponent = __decorate([
Component({
selector: 'app-root',
templateUrl: true === true
? './app.component.html'
: './app.component.copy.html',
styles: [__NG_CLI_RESOURCE__0, __NG_CLI_RESOURCE__1]
})
], AppComponent);
```

```
// commonjs

//...
exports.AppComponent = AppComponent = tslib_1.__decorate([
(0, core_1.Component)({
selector: 'app-root',
templateUrl: true === true
? './app.component.html'
: './app.component.copy.html',
styles: [require("./app.component.css?ngResource"), require("./app.component.2.css?ngResource")]
})
], AppComponent);
```

### Exception or Error

```text
Component 'AppComponent' is not resolved:
- templateUrl: ./app.component.html
Did you run and wait for 'resolveComponentResources()'?
```
```

### Your Environment

```text
Angular CLI: 17.3.6
Node: 20.12.2
Package Manager: yarn 1.22.17
OS: darwin x64

Angular: 18.0.0-rc.0
... animations, cdk, common, compiler, compiler-cli, core, forms
... localize, material, platform-browser
... platform-browser-dynamic, platform-server, router
... service-worker

Package Version
------------------------------------------------------
@angular-devkit/architect 0.0.0-EXPERIMENTAL-PLACEHOLDER
@angular-devkit/core 0.0.0-PLACEHOLDER
@angular-devkit/schematics 0.0.0-PLACEHOLDER
@angular/bazel 18.1.0-next.0+sha-1872fcd
@angular/build-tooling 0.0.0-e6e98d32d7d4d350ecf4ec10ad9c7e75198daabd
@angular/ng-dev
@schematics/angular 0.0.0-PLACEHOLDER
ng-packagr 18.0.0-rc.0
rxjs 7.8.1
typescript 5.4.5
webpack 5.91.0
zone.js 0.14.4
```

### Anything else relevant?

Related to this bug https://github.com/thymikee/jest-preset-angular/issues/1866

贡献指南

打开贡献指南

调研方向

首先运行 packages/ngtools/webpack/src/transformers/replace_resources_spec.ts,并阅读相关的 replace_resources.ts transformer。使用失败的 conditional templateUrl reproduction,并比较生成的 ESM 和 CommonJS 输出。当两种形式都能正确转换 conditional resource 且测试通过时,即表示完成。

由索引模型根据 Issue 内容生成。

评估

技术栈
angular, typescript, webpack
领域
build-system, tooling
Issue 类型
缺陷
难度
3/5
预计耗时
1-2 天
活跃度
冷清
描述清晰度
描述清楚
新手友好度
68/100

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