Not exported from the top-level library entrypoint

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

Feb 7 '20

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This error happens if any component is exported in NgModuleand not included in your public_api.ts, Angular 9 will throw an 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…

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