How to configure "lib.externals" in ng-package.json ('BusyModule' is not exported)

Type of Issue

• Bug Report
• Feature Request
• Question, I guess

Description

I’m trying to create a simple angular library in which I use angular2-busy as an npm package, I import it normally and everything works when compiling my source with webpack or directly with tsc.

But I alway get the error when using ng-packagr 'BusyModule' is not exported by ..\..\node_modules\angular2-busy\index.js

the file looks like

"use strict";
function __export(m) {
    for (var p in m) if (!exports.hasOwnProperty(p)) exports[p] = m[p];
}
Object.defineProperty(exports, "__esModule", { value: true });
__export(require("./build/index"));
//# sourceMappingURL=index.js.map

Since I’m fairly new to the JS-World, my question is: Can I solve this on my side or is this something ng-packagr has to solve. Or is this this something I have to bring to angular2-busy’s authors attention?

How To Reproduce

include angular2-busy as dependency and import it somewhere.

Expected Behaviour

compile it

Version Information

ng-packagr: v1.0.1
node: v8.4.0
@angular: v4.3.6

please include any version information that might be relevant, e.g. other third-party libraries

[dherges]

These are the external and globals properties passed thru to rollup.

Rollup says for external:

• the name of an external dependency
• a resolved ID (like an absolute path to a file)

Globals is essentially the same but being used for the UMD bundle:

…we want to tell Rollup that the jquery module ID equates to the global $ variable:

https://rollupjs.org/#big-list-of-options

I try to re-phrase how to set the externals of ng-packagr: lib.externals is key-value pair of external dependencies of an Angular library. The key should be the import path (as used in TypeScript import {} from "" statement. The value should be the module ID for the UMD bundle. In rxjs, this is Rx.Classname or the Rx.Classname.prototype. In @angular packages, this is the token that they have configured in their build chain.

[dherges]

Do you have externals set in ng-package.json?

{
  "$schema": "./node_modules/ng-packagr/ng-package.schema.json",
  "lib": {
    "entryFile": "public_api.ts".
    "externals": {
      /* ... *(
    }
  }
}

See https://github.com/dherges/ng-packagr/issues/85#issuecomment-321256775

We should have better documentation in ng-packagr for this… Oo