Unhandled exception adding Ionic to Angular 19 webapp

[russellsaintcyr-mercuryfinancial]

We have an existing Angular 19.2.10 app, and wish to try out integrating Ionic. Your documentation says we should run the Angular CLI command ng add @ionic/angular but we get an unhandled exception "Class extends value undefined is not a constructor or null." Any insights would be appreciated.

russellsaintcyr@SNC02WC4VAHTD5 mercurycard % npx ng add @ionic/angular
✔ Determining Package Manager
  › Using package manager: npm
✔ Searching for compatible package version
  › Found compatible package version: @ionic/angular@8.5.8.
✔ Loading package information from registry
✖ Class extends value undefined is not a constructor or null
An unhandled exception occurred: Class extends value undefined is not a constructor or null
See "/private/var/folders/wm/c09cyllx3xzgtzqp0zh3zssr0000gn/T/ng-BX5qw0/angular-errors.log" for further details.

The angular-errors.log is as follows:

[error] TypeError: Class extends value undefined is not a constructor or null
    at Object.<anonymous> (/Users/russellsaintcyr/projects/lendingplatform/mercurycard/node_modules/@listr2/prompt-adapter-inquirer/dist/index.cjs:30:62)
    at Module._compile (node:internal/modules/cjs/loader:1562:14)
    at Object..js (node:internal/modules/cjs/loader:1699:10)
    at Module.load (node:internal/modules/cjs/loader:1313:32)
    at Function._load (node:internal/modules/cjs/loader:1123:12)
    at TracingChannel.traceSync (node:diagnostics_channel:322:14)
    at wrapModuleLoad (node:internal/modules/cjs/loader:217:24)
    at Module.require (node:internal/modules/cjs/loader:1335:12)
    at require (node:internal/modules/helpers:136:16)
    at /Users/russellsaintcyr/projects/lendingplatform/mercurycard/node_modules/@angular/cli/src/commands/add/cli.js:265:108
    at async Task.task [as taskFn] (/Users/russellsaintcyr/projects/lendingplatform/mercurycard/node_modules/@angular/cli/src/commands/add/cli.js:265:60)
    at async Task.run (/Users/russellsaintcyr/projects/lendingplatform/mercurycard/node_modules/@angular/cli/node_modules/listr2/dist/index.cjs:2143:11)

[russellsaintcyr-mercuryfinancial]

Closing to recreate since the ticket was not created correctly.

[ionitron-bot]

Thanks for the issue! This issue is being locked to prevent comments that are not relevant to the original issue. If this is still an issue with the latest version of Ionic, please create a new issue and ensure the template is fully filled out.