Cannot extract i18n from library since angular 18

[magioloro]

Command

extract-i18n

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

17

Description

I have a multi-project workspace with 2 applications and 1 library, which uses all i18n. In angular 17 I could simply execute ng extract-i18n and all translations from all applications and the library were extracted in one single file.

After updating to version 18 and executing ng extract-i18n the following message appears:

Error: Cannot determine project for command.
This is a multi-project workspace and more than one project supports this command. Run "ng extract-i18n [project]" to execute the command for a specific project or change the current working directory to a project directory.
Available projects are:

• application1
• application2

So I have to extract the translations from each single application and the library isn't supported anymore?

Minimal Reproduction

ng extract-i18n

Exception or Error

Your Environment

Angular CLI: 18.2.12
Node: 18.20.2
Package Manager: yarn 3.6.1
OS: win32 x64

Angular: 18.2.13
... animations, common, compiler, compiler-cli, core, forms
... language-service, localize, platform-browser
... platform-browser-dynamic, router

Package                            Version
------------------------------------------------------------
@angular-devkit/architect          0.1802.12
@angular-devkit/build-angular      18.2.12
@angular-devkit/core               18.2.12
@angular-devkit/schematics         18.2.12
@angular/cdk                       18.2.14
@angular/cli                       18.2.12
@angular/material                  18.2.14
@angular/material-moment-adapter   18.2.14
@schematics/angular                18.2.12
ng-packagr                         18.2.1
rxjs                               7.8.1
typescript                         5.4.5
zone.js                            0.15.0

Anything else relevant?

No response

[alan-agius4]

I18n extraction from multiple projects at once, and from libraries were never supported.

I am not entirely sure how this worked in your case, but maybe you were using a non official builder or TypeScript path mappings?

See: #17140

[magioloro]

I18n extraction from multiple projects at once, and from libraries were never supported.

I am not entirely sure how this worked in your case, but maybe you were using a non official builder or TypeScript path mappings?

See: #17140

Yes, i use a path mapping

"paths": {
      "@libs": [
        "./dist/libs"
      ]
}

But no I follow the tip in #17140 and added "extract-i18n" in the architects section of my lib. But I get the following message by now:

Tried to extract from libs with 'projectType' library, which is not supported. The 'extract-i18n' builder can only extract from applications.

So translating libraries isn't supported at all, although it is allegedly supported? https://v18.angular.dev/cli/extract-i18n