Build application with prerender routes file fails

[wendevlin]

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

compiler

Is this a regression?

Yes

Description

I migrated my app to Angular 17 --> works as expected.

Now I want to get rid of my webpack build.

So I migrate my prerendering to @angular-devkit/build-angular:application:

          "builder": "@angular-devkit/build-angular:application",
          "options": {
              "outputPath": "dist/browser",
              "index": "src/index.html",
              "browser": "src/main.ts",
              "polyfills": [ "src/polyfills.ts" ],
              "tsConfig": "tsconfig.app.json",
              "inlineStyleLanguage": "scss",
              "assets": [
                "src/favicon.ico",
                "src/assets",
                "src/sitemap.xml",
                "src/robots.txt"
              ],
              "styles": [
                "src/styles.scss"
              ],
              "scripts": [],
              "prerender": {
                "discoverRoutes": false,
                "routesFile": "routes.txt"
              }
          },
....

when I run then the build with ng build I get following error:

An unexpected error occurred: [object Object]
error: script "build" exited with code 1

This only happens when prerender options is:

              "prerender": {
                "discoverRoutes": false,
                "routesFile": "routes.txt"
              }

              "prerender": {
                "routesFile": "routes.txt"
              }

              "prerender": {
                "discoverRoutes": true,
              }

              "prerender":  true

my routes.txt is correct.

Please provide a link to a minimal reproduction of the bug

https://github.com/WhizUs-Labs/angular-prerender-test

Please provide the exception or error you saw

An unexpected error occurred: [object Object]
error: script "build" exited with code 1

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

Angular CLI: 17.2.3
Node: 20.11.1
Package Manager: bun 1.0.30
OS: linux x64

Angular: 17.2.4
... animations, common, compiler, compiler-cli, core, forms
... localize, platform-browser, platform-browser-dynamic
... platform-server, router

Package                         Version
---------------------------------------------------------
@angular-devkit/architect       0.1702.3
@angular-devkit/build-angular   17.2.3
@angular-devkit/core            17.2.3
@angular-devkit/schematics      17.2.3
@angular/cdk                    17.2.2
@angular/cli                    17.2.3
@angular/google-maps            17.2.2
@angular/ssr                    17.2.3
@schematics/angular             17.2.3
rxjs                            7.8.1
typescript                      5.2.2
zone.js                         0.14.4

Anything else?

No response

[alan-agius4]

This seems like a bug but we'll need to look at a reproduction to find and fix the problem. Can you setup a minimal repro please?

You can read here why this is needed. A good way to make a minimal repro is to create a new app via ng new repro-app and adding the minimum possible code to show the problem. Then you can push this repository to github and link it here.

This might be related to your directory structure so its really important to get an accurate repro to diagnose this.

[wendevlin]

Hi,

Sure: https://github.com/WhizUs-Labs/angular-prerender-test

My serve is also not working with this example. Maybe it is just a config issue, but what definitely is a bug is the error message, because object object doesn´t help to solve the issue.

This seems like a bug but we'll need to look at a reproduction to find and fix the problem. Can you setup a minimal repro please?

You can read here why this is needed. A good way to make a minimal repro is to create a new app via ng new repro-app and adding the minimum possible code to show the problem. Then you can push this repository to github and link it here.

This might be related to your directory structure so its really important to get an accurate repro to diagnose this.

[alan-agius4]

The problem in this case is that the "server" entrypoint is not defined. I'll open a PR to fix the error message.