🐞 Bug report

What modules are related to this issue?

• builders
• common
• express-engine

Is this a regression?

Description

Sometimes, errors occur on the SSR server. Those errors always only show the stack traces of the optimized and uglyfied version of the source code (e.g something/dist/project/server/main.js:1:123456). Those traces make it very hard to debug the issue(s).

I tried to enable source maps when building & executing the app, but to no avail.

🔬 Minimal Reproduction

Either copy this demo repo here, or bootstrap a new Angular application, add Angular Universal, and throw an error somewhere. I decided to just throw an error in the AppModule, but anything goes as long as you can cause it.

Next, start the dev:ssr server by running npm run dev:ssr. For a more production-like test, build the project and run it with node --enable-source-maps dist/<project>/server/main.js

Then, trigger the error on the SSR server and look at the stack trace. It shows the line numbers of the compiled, uglified main.js file rather than the source-code lines. Neither the dev server provided by the ng CLI, nor manually calling node --enable-source-maps dist/<project>/server/main.js work.

🔥 Exception or Error

What I see is a stack like this one:

Error: BOOM
    at new AppModule (dist/ssr-sourcemap-test/server/main.js:368:19)
    at Object.AppModule_Factory [as useFactory] (dist/ssr-sourcemap-test/server/main.js:372:57)
   [... omitted for bravery ... ]

But what I expect is something like this:

Error: BOOM
    at new AppModule (src/app/app.module.ts:32:7)
   // etc...

The server generates the main.map.js properly, but something appears to be broken when trying to parse it. I haven't figured out a way of fixing/debugging this, however.

🌍 Your Environment

     _                      _                 ____ _     ___
    / \   _ __   __ _ _   _| | __ _ _ __     / ___| |   |_ _|
   / △ \ | '_ \ / _` | | | | |/ _` | '__|   | |   | |    | |
  / ___ \| | | | (_| | |_| | | (_| | |      | |___| |___ | |
 /_/   \_\_| |_|\__, |\__,_|_|\__,_|_|       \____|_____|___|
                |___/
    

Angular CLI: 14.2.2
Node: 16.14.0
Package Manager: npm 8.3.1 
OS: linux x64

Angular: 14.2.1
... animations, common, compiler, compiler-cli, core, forms
... platform-browser, platform-browser-dynamic, platform-server
... router

Package                         Version
---------------------------------------------------------
@angular-devkit/architect       0.1402.2
@angular-devkit/build-angular   14.2.2
@angular-devkit/core            14.2.2
@angular-devkit/schematics      14.2.2
@angular/cli                    14.2.2
@nguniversal/builders           14.2.0
@nguniversal/express-engine     14.2.0
@schematics/angular             14.2.2
rxjs                            7.5.6
typescript                      4.7.4