Ivy: using local npm package does not compile

Affected Package

compiler.

Is this a regression?

did work with 8.x

Description

I have a local npm package declared like.

"@eiswind/proto-client-api": "../frontendclient/target/generated-sources/openapi/",

This used to work with 8.x but with 9 it gives me a trace like follows:

ERROR in .client/target/generated-sources/openapi/index.ts
Module build failed (from ./node_modules/@ngtools/webpack/src/index.js):
Error: /home/thomas/projects/eiswind/angular-proto-nebular/frontendclient/target/generated-sources/openapi/index.ts is missing from the TypeScript compilation. Please make sure it is in your tsconfig via the 'files' or 'include' property.
    at AngularCompilerPlugin.getCompiledFile (/home/thomas/projects/eiswind/angular-proto-nebular/frontend/node_modules/@ngtools/webpack/src/angular_compiler_plugin.js:909:23)
    at /home/thomas/projects/eiswind/angular-proto-nebular/frontend/node_modules/@ngtools/webpack/src/loader.js:41:31
    at runMicrotasks (<anonymous>)
    at processTicksAndRejections (internal/process/task_queues.js:94:5)
 @ ./src/app/product-management/onix-provider.service.spec.ts 4:0-60 12:25-40
 @ ./src sync \.spec\.ts$
 @ ./src/test.ts

🌍 Your Environment

**Angular Version:**
Angular CLI: 9.0.1
Node: 12.14.1
OS: linux x64

Angular: 9.0.0
... animations, common, compiler, compiler-cli, core, forms
... language-service, platform-browser, platform-browser-dynamic
... router
Ivy Workspace: Yes

Package                           Version
-----------------------------------------------------------
@angular-devkit/architect         0.900.1
@angular-devkit/build-angular     0.900.1
@angular-devkit/build-optimizer   0.900.1
@angular-devkit/build-webpack     0.900.1
@angular-devkit/core              9.0.1
@angular-devkit/schematics        9.0.1
@angular/cdk                      9.0.0
@angular/cli                      9.0.1
@ngtools/webpack                  9.0.1
@schematics/angular               9.0.1
@schematics/update                0.900.1
rxjs                              6.5.4

[eiswind]

please take a look at https://github.com/eiswind/ng-35247

to reproduce: goto frontendclient/target/generated-sources/openapi (this normally gets generated) npm install npm run build

goto frontend npm install ng test

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