Angular 18 production build doesn't work with vendor source maps

从 angular.json 的 sourceMap 配置开始，并使用 production 配置比较文档中记录的 ng serve 和 ng build 命令的输出。使用 Angular CLI 18.1.1 重现 vendor source maps 的 404，然后跟踪 production build 路径，以确定为何会省略 node_modules 中的 map。完成标准是 production build 能够加载 vendor source maps，同时其他 source maps 继续正常工作。

Which @angular/* package(s) are the source of the bug?

compiler-cli

Is this a regression?

Yes

Description

We upgraded our apps from ng17 to 18 and adopted the new build system. In our angular.json file we had options set to enable vendor source maps for production and regular builds. This worked fine prior to the upgrade. Example config below for references as I cannot post details from our work setup.

{
  "projects": {
    "your-project-name": {
      "architect": {
        "build": {
          "options": {
            "sourceMap": {
              "scripts": true,
              "vendor": true
            }
          }
        }
      }
    }
  }
}

So when running ng serve with a production config the source maps for things like RX are debuggable without issue.

ng serve application --open live-reload --configuration=production

However when we run our release jobs using this command we find the disted app does not support loading source maps from node_modules. All other source maps seem to work fine .

ng build application --configuration=production

I looked for a documented change here to see if vendor source maps are still supported in production builds and couldn't find anything about them being deprecated.

Please provide a link to a minimal reproduction of the bug

No response

Please provide the exception or error you saw

404 cannot load source map

Please provide the environment you discovered this bug in (run ng version)

Angular CLI Version: 18.1.1
Node Version: 20.11.1
Package Manager: npm 10.2.4
Operating System: win32 x64 (Windows 64-bit)


@angular-devkit/architect: 0.1801.1
@angular-devkit/build-angular: 18.1.1
@angular-devkit/core: 18.1.1
@angular-devkit/schematics: 18.1.1
@schematics/angular: 18.1.1
ng-packagr: 18.1.0
rxjs: 7.8.1
typescript: 5.5.4
webpack: 5.92.1
zone.js: 0.14.3

Anything else?

No response