angular / angular/angular-cli

vite dev-server doesn't allow lazy loaded modules debugging

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angular/build:dev-server area: @angular/build needs: investigation
主要語言
TypeScript
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描述

### Command

serve

### 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

16 (with webpack)

### Description

If you try to debug a lazy loaded component form vscode, and set a breakpoint, say into ngOnInit of the component, vite never stops when reaches the breakpoint.
![immagine](https://github.com/user-attachments/assets/18f5f134-c7f9-4ab0-9262-12c06805e2b2)

It's difficult to give more data, as
- there is no way to change vite config (to add verbosity, for example)
- looking in the output window, there is nothing tha allows to see vite output

### Minimal Reproduction

create a new 18.2 application, add a lazy loaded route, start debugging from visual studio code, set a breakpoint on a line inside the lazy loaded component.
the component renders correctly but vite never stops for the breakpoint.
Here a repository that reproduces the bug. I tested it only in Vscode.
[https://github.com/alfmosmq/lazy-loading-debug-test](https://github.com/alfmosmq/lazy-loading-debug-test)

### Exception or Error

_No response_

### Your Environment

```text
Angular CLI: 18.2.2
Node: 20.17.0
Package Manager: npm 10.2.4
OS: win32 x64

Angular: 18.2.2
... animations, cli, common, compiler, compiler-cli, core, forms
... platform-browser, platform-browser-dynamic, platform-server
... router, ssr

Package Version
---------------------------------------------------------
@angular-devkit/architect 0.1802.2
@angular-devkit/build-angular 18.2.2
@angular-devkit/core 18.2.2
@angular-devkit/schematics 18.2.2
@schematics/angular 18.2.2
rxjs 7.8.1
typescript 5.5.4
zone.js 0.14.10
```

### Anything else relevant?

this image shows that the app is actually split in main and a lazy loaded module
![immagine](https://github.com/user-attachments/assets/fbaec1ce-0d88-4295-810b-546aa4c66d57)
launch.json:
```
{
// For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
"version": "0.2.0",
"configurations": [
{
"name": "ng serve",
"type": "chrome",
"request": "launch",
"preLaunchTask": "npm: start",
"url": "http://localhost:4200/"
},
{
"name": "ng test",
"type": "chrome",
"request": "launch",
"preLaunchTask": "npm: test",
"url": "http://localhost:9876/debug.html"
}
]
}
```
tasks.json:
```
{
// For more information, visit: https://go.microsoft.com/fwlink/?LinkId=733558
"version": "2.0.0",
"tasks": [
{
"type": "npm",
"script": "start",
"isBackground": true,
"problemMatcher": {
"owner": "typescript",
"pattern": "$tsc",
"background": {
"activeOnStart": true,
"beginsPattern": {
"regexp": "(.*?)"
},
"endsPattern": {
"regexp": "bundle generation complete"
}
}
}
},
{
"type": "npm",
"script": "test",
"isBackground": true,
"problemMatcher": {
"owner": "typescript",
"pattern": "$tsc",
"background": {
"activeOnStart": true,
"beginsPattern": {
"regexp": "(.*?)"
},
"endsPattern": {
"regexp": "bundle generation complete"
}
}
}
}
]
}
```

貢獻指南

開啟貢獻指南

研究方向

從連結的 lazy-loading 重現和使用 Vite 的 Angular CLI `serve` 路徑開始。執行 VS Code 的 `launch.json` 設定,在 lazy-loaded 元件中設定中斷點,並將其與主要 bundle 中的中斷點進行比較。當偵錯在 lazy-loaded 元件中斷點處停止,或已根據相關輸出記錄此限制時,即表示完成。

由索引模型根據 Issue 內容生成。

評估

技術堆疊
angular, typescript, vite, vscode
領域
build-system, developer-experience, devtools
Issue 類型
缺陷
難度
4/5
預估耗時
3-5 天
活躍度
停滯
描述清晰度
基本清楚
新手友好度
35/100

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