CLI Build Optimization removes namespace export from third party library

[pfeigl]

Versions

Angular CLI: 6.0.3
Node: 8.11.1
OS: win32 x64
Angular: 6.0.2
... animations, common, compiler, compiler-cli, core, forms
... http, language-service, platform-browser
... platform-browser-dynamic, router

Package                           Version
-----------------------------------------------------------
@angular-devkit/architect         0.6.3
@angular-devkit/build-angular     0.6.3
@angular-devkit/build-optimizer   0.6.3
@angular-devkit/core              0.6.3
@angular-devkit/schematics        0.6.3
@angular/cdk                      6.0.0
@angular/cli                      6.0.3
@angular/flex-layout              6.0.0-beta.15
@angular/material                 6.0.0
@ngtools/json-schema              1.1.0
@ngtools/webpack                  6.0.3
@schematics/angular               0.6.3
@schematics/update                0.6.3
ng-packagr                        3.0.0-rc.5
rxjs                              6.1.0
typescript                        2.7.2
webpack                           4.8.3

Repro steps

• Build a library with the following export

export namespace Claims {
    export class Users {
        public static readonly Manage = "Users.Manage";
    }
}

• Results in the following JS

    /**
     * @fileoverview added by tsickle
     * @suppress {checkTypes} checked by tsc
     */
    (function (Claims) {
        var Users = (function () {
            function Users() {
            }
            Users.Manage = "Users.Manage";
            return Users;
        }());
        Claims.Users = Users;
    })(exports.Claims || (exports.Claims = {}));

• Create a minimal angular-cli project, consume the library and access the code. Here is how we did it

import { Claims as WebClaims, MenuItem } from "@my/library";

export class AppComponent {
    public menuItems: MenuItem[] = [
        { text: "user-management", icon: "supervisor_account", routerLink: "/users", claims: WebClaims.Users.Manage }
    ];
}

Observed behavior

ERROR TypeError: Cannot read property 'Manage' of undefined
When looking at the optimized build, the complete code for the claims has been gone.

Desired behavior

Required code is not optimized away.

Mention any other details that might be useful (optional)

Has been working on Angular v5, started to not work after Angular has been updated to Angular v6

[filipesilva]

I believe this issue is the same as angular/devkit#934, which was fixed by angular/devkit#959.

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