ng add @angular/pwa - Cannot read property 'length' of undefined

[GeorgiyZhuravlev]

🐞 Bug report

Command (mark with an x)

• new
• build
• serve
• test
• e2e
• generate
• add
• update
• lint
• xi18n
• run
• config
• help
• version
• doc

Is this a regression?

I don't know

Description

If your src/app/app.module.ts imports environment with the alias like this:

import {environment as env} from '../environments/environment';

ng add @angular/pwa fails with Cannot read property 'length' of undefined

🔬 Minimal Reproduction

1. create empty project with angular-cli, eg:
   ng new some-app --prefix=some
2. add this line to src/app/app.module.ts
import {environment as env} from '../environments/environment';
3. try to add @angular/pwa to project
   ng add @angular/pwa --project some-app

🔥 Exception or Error

ng add @angular/pwa --project some-app

Installing packages for tooling via npm.
+ @angular/pwa@0.803.19
added 5 packages from 2 contributors and audited 18936 packages in 6.047s
found 0 vulnerabilities

Installed packages for tooling via npm.
Cannot read property 'length' of undefined

🌍 Your Environment

Angular CLI: 8.3.19
Node: 10.16.3
OS: darwin x64
Angular: 8.2.14
... animations, common, compiler, compiler-cli, core, forms
... language-service, platform-browser, platform-browser-dynamic
... router

Package                           Version
-----------------------------------------------------------
@angular-devkit/architect         0.803.19
@angular-devkit/build-angular     0.803.19
@angular-devkit/build-optimizer   0.803.19
@angular-devkit/build-webpack     0.803.19
@angular-devkit/core              8.3.19
@angular-devkit/schematics        8.3.19
@angular/cli                      8.3.19
@angular/pwa                      0.803.19
@ngtools/webpack                  8.3.19
@schematics/angular               8.3.19
@schematics/update                0.803.19
rxjs                              6.4.0
typescript                        3.5.3
webpack                           4.39.2

Anything else relevant?

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