Angular library secondary entry points that depend on each other

Question

I'm trying to make an angular library with secondary entry point for every module.

I have three modules: A, B and C. A is standalone, but B depends on C, meaning I have import to get C.module.ts in B.module.ts.

I followed this article, so I have a package.json, index.ts and public_api.ts files in every module.

When I try to build the lib, I get the following error:

------------------------------------------------------------------------------
Building entry point '@org/library-name/src/lib/A'
------------------------------------------------------------------------------
Compiling TypeScript sources through ngc
Bundling to FESM2015
Bundling to UMD
Minifying UMD bundle
Writing package metadata
Built @org/library-name/src/lib/A

------------------------------------------------------------------------------
Building entry point '@org/library-name/src/lib/B'
------------------------------------------------------------------------------
Compiling TypeScript sources through ngc
ERROR: Unable to write a reference to CComponent in /.../projects/library-name/src/lib/C/C.component.ts from /.../projects/library-name/src/lib/C/C.module.ts

Any idea on how to make it work? Thanks in advance.

Answer 1

I can tell you how I workarounded this problem.

The problem here is to understand how ng-packagr builds our libraries depending the entry-points/folder structure.

In my particular situation I had the following structure:

The output is 2 chunks, right? my-lib/common and my-lib/common/big-chunk

It happens that the secondary entry points are built BEFORE the main one, so having a shared logic, I will need to put it (and export it) on the secondary entry-point my-lib/common/big-chunk and use it on the main one my-lib/common.

If you find yourself with the need of sharing logic, consider to create a shared entry point.

I found very tricky to use and implement secondary entry points and some refactors might be needed to make them work and take the whole benefit they can bring, but overall I think it totally worth it :)