Run TaskGenerateHilla only in build-frontend phase after npm dependencies install

[platosha]

Description of the bug / feature

TaskGenerateHilla runs the multi-module parser / generator for Hilla, which depend on:

• Java compiled classes
• npm dependencies, namely @hilla/generator-typescript-cli

Minimal reproducible example

• Create a project with 23.2-SNAPSHOT Hilla and Flow
• Include / enable the multi-module engine
• Start the application

Expected behavior

The engine is run by the build-frontend goal or DevModeInitializer, after npm dependencies are installed.

Actual behavior

The prepare-frontend goal attempts to run TaskGenerateHilla, which fails because of missing npm dependencies.

Versions:

- Vaadin / Flow version: 23.2-SNAPSHOT

[cromoteca]

The build-frontend task is not run in dev mode. Wouldn't it be easier to fix the order of execution in prepare-frontend?

[vaadin-bot]

This ticket/PR has been released with Vaadin 23.2.0.beta2 and is also targeting the upcoming stable 23.2.0 version.