Multi-library which depends on each other build error: Cannot find module

Type of Issue

[x] Bug Report
[ ] Feature Request

Description

I create a repo which has two libraries, one of them depends on the other. When I build that library I get this error: Cannot find module xx.

How To Reproduce

You can reproduce it with the repo here. It will be ok if you build lib-a by run ng build lib-a, but get error if you build lib-b which import lib-a in lib-b/src/lib/lib-b.module.ts. I have set the path-mapping in lib-b/tsconfig.lib.json like below.

{
  "extends": "../../tsconfig.json",
  "compilerOptions": {
    "outDir": "../../out-tsc/lib",
    "target": "es2015",
    "declaration": true,
    "inlineSources": true,
    "types": [],
    "lib": ["dom", "es2018"],
    "baseUrl": "./",
    "paths": {
      "lib-a": ["../lib-a"]
    }
  },
  "angularCompilerOptions": {
    "annotateForClosureCompiler": true,
    "skipTemplateCodegen": true,
    "strictMetadataEmit": true,
    "fullTemplateTypeCheck": true,
    "strictInjectionParameters": true,
    "enableResourceInlining": true
  },
  "exclude": ["src/test.ts", "**/*.spec.ts"]
}

Here is the error message when I run ng build lib-b

ERROR: projects/lib-b/src/lib/lib-b.module.ts(3,28): error TS2307: Cannot find module 'lib-a'.
projects/lib-b/src/lib/lib-b.module.ts(7,13): Error during template compile of 'LibBModule'
  Could not resolve lib-a relative to [object Object]..
projects/lib-b/src/lib/lib-b.module.ts(7,13): Error during template compile of 'LibBModule'
  Could not resolve lib-a relative to [object Object]..

An unhandled exception occurred: projects/lib-b/src/lib/lib-b.module.ts(3,28): error TS2307: Cannot find module 'lib-a'.
projects/lib-b/src/lib/lib-b.module.ts(7,13): Error during template compile of 'LibBModule'
  Could not resolve lib-a relative to [object Object]..
projects/lib-b/src/lib/lib-b.module.ts(7,13): Error during template compile of 'LibBModule'
  Could not resolve lib-a relative to [object Object]..

Expected Behaviour

Build multi-library which depends on each other successfully.

Version Information

$ node_modules/.bin/ng-packagr --version
ng-packagr: 5.1.0
@angular/*: 8.1.1
typescript: 3.4.3
rxjs: 6.4.0
node: 10.15.3
npm: 6.4.1

[alan-agius4]

PS: you also need to add "lib-a/*": ["../../dist/lib-a/*"] to your paths

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