Ionic 4 library build - BUILD ERROR error TS5060: Option 'paths' cannot be used without specifying '--baseUrl' option.

[ebeling]

I like to build a library for sharing it with team. Since Angular 6 this is possible. So I created a new blank ionic project with:
ionic start myApp blank --cordova
Then I created a library with:
ng generate library xxxlib
if I try to package the library with:
ionic build --project xxxlib
an error occures:

...
Building Angular Package
Building entry point 'xxxlib'
Compiling TypeScript sources through ngc

BUILD ERROR
error TS5060: Option 'paths' cannot be used without specifying '--baseUrl' option.

I found following bug and fix for angular-cli:
angular/angular-cli#11258

This is not the same problem, because here was speaking about a migration but can it be, that the ionic starter script is also not writing the necessary baseUrl to tsconfig.json ?

ionic info

Ionic:

ionic (Ionic CLI) : 4.3.1 (/usr/lib/node_modules/ionic)
Ionic Framework : @ionic/angular 4.0.0-beta.15
@angular-devkit/build-angular : 0.8.6
@angular-devkit/schematics : 0.8.6
@angular/cli : 6.2.6
@ionic/angular-toolkit : 1.1.0

Cordova:

cordova (Cordova CLI) : 8.0.0
Cordova Platforms : none
Cordova Plugins : no whitelisted plugins (0 plugins total)

System:

NodeJS : v8.12.0 (/usr/bin/node)
npm : 6.4.1
OS : Linux 3.16

[paulstelzer]

Thanks for your issue! I think you missed something. Could you please create a new Ionic 4 project?

Keep i mind to update the ionic cli to the latest version before!

[paulstelzer]

UPDATE: I saw you try to create a library, this is a feature of Angular. So if I am right, this is not supported by Ionic. If you need library support, please open this a Feature Request and tell us the use case and more information about it!

[ebeling]

I implement services, which I like to use in more than one ionic project. That's why I need library support.
And the problem above I solved with adding a compilerOption in tsconfig.json:
"compilerOptions": { "baseUrl": "./projects", ... }

It should be possible to add this automatically while generating Ionic project!

[paulstelzer]

@ebeling Thanks for clarify! Could you please open a feature request for it? That would be great :) PS: I think that feature request should be added at the ionic/cli -> https://github.com/ionic-team/ionic-cli

[ionitron-bot]

Thanks for the issue! This issue is being locked to prevent comments that are not relevant to the original issue. If this is still an issue with the latest version of Ionic, please create a new issue and ensure the template is fully filled out.