Hilla packages are not installed when ReactAdapter+Endpoint is used without React views

[mshabarov]

Describe the bug

This enhancement has been done to how Hilla discovers endpoints and installs needed packages.

I've just tested this with the 24.7 pre-release and it seems broken, I got:

Error: Cannot find module 'xxx/skeleton-starter-flow-spring/node_modules/@vaadin/hilla-generator-cli/bin/index.js'
    at Function._resolveFilename (node:internal/modules/cjs/loader:1249:15)
    at Function._load (node:internal/modules/cjs/loader:1075:27)
    at TracingChannel.traceSync (node:diagnostics_channel:322:14)
    at wrapModuleLoad (node:internal/modules/cjs/loader:219:24)
    at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:170:5)
    at node:internal/main/run_main_module:36:49 {
  code: 'MODULE_NOT_FOUND',
  requireStack: []
}

and node_modules/@vaadin indeed has no Hilla packages installed.

Application fails to start.

Configuration (see attached branch):

• ReactAdapterElement that uses Hilla Endpoint
• Hilla Endpoint
• ReactAdapterComponent that used as a route
• no React views

Expected-behavior

Application should install Hilla packages and start normally when Endpoint is used from ReactAdapterElement.

Reproduction

Can be reproduced with this branch https://github.com/vaadin/skeleton-starter-flow-spring/tree/react-adapter-with-endpoint. Just start the app with mvn and you'll see the error.

System Info

Vaadin 24.7.0.alpha8.

[tepi]

Closing due to reverting #20289