This class is visible to consumers via SomeModule -> SomeComponent, but is not exported from the top-level library entrypoint

angular angular-library angular9
Aniruddha Das picture Aniruddha Das · Feb 7, 2020 · Viewed 9.2k times · Source

I upgraded all my angular library to angular 9.0.0 using ng update and when I try to build them I got below error.

Error:

Unsupported private class SomeComponent. This class is visible to consumers via SomeModule -> SomeComponent, but is not exported from the top-level library entrypoint.

Anyone solved this error?

Answer

Aniruddha Das picture Aniruddha Das · Feb 7, 2020

This error happens if any component is exported in NgModuleand not included in your public_api.ts, angular 9 will through error now.

This error was not coming in angular 8 but after upgrading to angular 9 it started showing.

If you exported any service, module or component, etc in NgModule make sure to include them in public_api.ts or else angular 9 will throw error now.

Fix: add your component to the public_api.ts

export * from './lib/components/some-me/some-me.component';

Related questions

'rootDir' is expected to contain all source files

I have an Angular CLI workspace containing two library projects, foo and bar. When I build the second of the two libraries, foo, the build fails with the following error: error TS6059: File '/code/projects/bar/src/lib/types.…

Read More
How to add global style to angular 6/7 library

I was trying to add global styles in the same way like in angular app, but it totally does not work. My libraries' name is example-lib, so I added styles.css to /projects/example-lib/. I added styles in main angular.…

Read More
Configuration 'production' could not be found in project 'my-lib'

I am building a library with Angular 6.1.0 ng new lib-demo ng generate library my-lib All the articles advise running the build for the library with a --prod flag like so: ng build my-lib --prod However, this throws an error Configuration …

Read More