Error "this.tree.readText is not a function" when run command "ng add @angular/pwa"

[vienle197]

Which @angular/* package(s) are the source of the bug?

service-worker

Is this a regression?

No

Description

Please provide a link to a minimal reproduction of the bug

No response

Please provide the exception or error you saw

No response

Please provide the environment you discovered this bug in (run ng version)

_                      _                 ____ _     ___
    / \   _ __   __ _ _   _| | __ _ _ __     / ___| |   |_ _|
   / △ \ | '_ \ / _` | | | | |/ _` | '__|   | |   | |    | |
  / ___ \| | | | (_| | |_| | | (_| | |      | |___| |___ | |
 /_/   \_\_| |_|\__, |\__,_|_|\__,_|_|       \____|_____|___|
                |___/


Angular CLI: 9.1.15
Node: 14.18.1
OS: win32 x64

Angular: 9.1.13
... animations, common, compiler, compiler-cli, core, forms
... language-service, platform-browser, platform-browser-dynamic
@angular/fire                     6.1.4
@angular/localize                 9.1.12
@angular/material                 9.2.4
@ngtools/webpack                  9.1.15
@schematics/angular               9.1.15
@schematics/update                0.901.15
rxjs                              6.6.7
typescript                        3.8.3
webpack                           4.42.0

Anything else?

No response

[alan-agius4]

Angular version 9 is no longer supported. Please see https://angular.io/guide/releases#support-policy-and-schedule for more information.

That said, as a workaround for the above you can provide the version specifier as part of the package name.

ng add @angular/pwa@0.901.15

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