PWA endpoint errors while called from SW

[krissvaa]

Describe the bug

Some issues stop endpoints from being called from the Service Worker.
Most of the issues are that window or document references are not available in the worker context.
Which should be quite easy to solve:

• hilla/packages/ts/frontend/src/Connect.ts

  Line 21 in c7d4707

  $wnd.Vaadin ??= {};

• hilla/packages/ts/frontend/src/Connect.ts

  Line 303 in c7d4707

  const csrfHeaders = getCsrfTokenHeadersForEndpointRequest(document);

• hilla/packages/ts/frontend/src/CookieManager.ts

  Line 8 in c7d4707

  path: calculatePath(new URL(document.baseURI)),

Then there are related to the same issue but more complicated issues:

1. __REGISTER__() includes references to window - but is defined in a different place
   https://github.com/vaadin/hilla/blob/c7d4707995f2235574f48d84a8619ab038beb503/packages/ts/frontend/src/index.ts#L8C1-L8C16

2. ConnectionState and ConnectionIndicator from @vaadin/common-frontend also have references to window and need to be either fixed in their repo or clone+fixed in hilla separately
   

   hilla/packages/ts/frontend/src/Connect.ts

   Line 2 in c7d4707

   import { ConnectionIndicator, ConnectionState } from '@vaadin/common-frontend';

3. Lastly there is an issue with atmosphere.js and default exports to Vite. Atmosphere dependency could be excluded by SW Vite plugin or by finding a better fix for exclusion as I am not sure about this approach.

RollupError: node_modules/@vaadin/hilla-frontend/FluxConnection.js (1:7): "default" is not exported by "node_modules/atmosphere.js/lib/browser.js", imported by "node_modules/@vaadin/hilla-frontend/FluxConnection.js".
at getRollupError (file:///app/node_modules/rollup/dist/es/shared/parseAst.js:396:41)
at error (file:///app/node_modules/rollup/dist/es/shared/parseAst.js:392:42)
at Module.error (file:///app/node_modules/rollup/dist/es/shared/node-entry.js:13858:16)
at Module.traceVariable (file:///app/node_modules/rollup/dist/es/shared/node-entry.js:14306:29)
at ModuleScope.findVariable (file:///app/node_modules/rollup/dist/es/shared/node-entry.js:11984:39)
at ChildScope.findVariable (file:///app/node_modules/rollup/dist/es/shared/node-entry.js:7432:38)
at ClassBodyScope.findVariable (file:///app/node_modules/rollup/dist/es/shared/node-entry.js:7432:38)
at ChildScope.findVariable (file:///app/node_modules/rollup/dist/es/shared/node-entry.js:7432:38)
at ChildScope.findVariable (file:///app/node_modules/rollup/dist/es/shared/node-entry.js:7432:38)
at FunctionScope.findVariable (file:///app/node_modules/rollup/dist/es/shared/node-entry.js:7432:38)

Missing CSRF token in calling endpoints is separated in an another issue: #2791

Expected-behavior

All DOM window or document references should be prefixed with self.window && window... or self.document && document... (or some alternative) so that SW could run without encountering them.

Reproduction

sw-app.zip

System Info

Hilla 24.5