Proposal: window service

[Toxicable]

TLDR: A pluggable service that provides a consistent pattern for providing services that usually exist on window across platforms that are Universal compatible.

API

interface WindowService {
  localStorage: Storage;
  sessionStorage: Storage;
  caches: CacheStorage;
  ...//other relevant apis
}

//modules
BrowserWindowServiceModule
ServerNoopWindowServiceModule

We'll provide a module that provides services that noop out the api's such as localstorage since it doesn't make any sense for that to work on the server, but in a way that it will be Universal compatible.

Pluggable

You can provide your own implementations for the services found inside the WindowService like so

{
  provide: LOCAL_STORAGE_BACKEND,
  useFactory: myServerLocalStorageBackendFactory
}

draft imp here https://github.com/Toxicable/universal/blob/local-storage/modules/common/src/local-storage/local-storage.ts

[CaerusKaru]

Wouldn't it be better to just provide a Window implementation, like @vikerman did for DOCUMENT? The only issue/PR I could find in angular/angular was angular/angular#12694, and the main detraction was lack of portability to node. However, just doing a quick search pulls up jsdom as a possible reference implementation (similar to how we use domino for Document).

It seems better to provide a catch-all implementation than to patch certain services. It would also encourage Angular users to avoid using window directly, which may/may not be an Angular anti-pattern.

[Toxicable]

jsdom would be a replacement for domino since it does the whole DOM, therefore that's not an option.
I already encourage users to not use window directly since it can often lead to unexpected behaviour, such as Universal incompatibility, but with this they can use it without such issues.

[CaerusKaru]

We wouldn't use jsdom explicitly, we could cherry-pick the higher-level options, and then use domino as the document property.

[Toxicable]

I havn't look at their imp but how would things like localStorage and other storage API's work? (the original reason for this).
The idea with this is to provide a consistent pattern for working with these API's that allows for users to easily plug in their own imps for specific API's without having to bloat their client side bundles or have platform checks everywhere. With default just being "it'll work, but do nothing", which is 100% fine for most cases i've heard so far

[CaerusKaru]

jsdom doesn't have LocalStorage, but there are other implementations around that we could patch this with, e.g. node-localstorage. My general suggestion, though, is that we shouldn't have an "a la carte" option, it should just be a catch-all.

[Ks89]

I found this issue thanks to this one: angular/universal-starter#189
I have a problem while trying to use hammerjs with SSR.
I tried to add it to the official angular-universal starter and the result is:

> ng-universal-demo@0.0.0 serve:ssr /Users/ks89/git/universal-starter
> node dist/server

/Users/ks89/git/universal-starter/dist/server.js:126460
})(window, document, 'Hammer');
   ^
ReferenceError: window is not defined
    at Object._MAP.8 (/Users/ks89/git/universal-starter/dist/server.js:126460:4)
    at __webpack_require__ (/Users/ks89/git/universal-starter/dist/server.js:20:30)
    at Object.LYNW (/Users/ks89/git/universal-starter/dist/server.js:105040:8254)
    at n (/Users/ks89/git/universal-starter/dist/server.js:105040:149)
    at Object.aR8+ (/Users/ks89/git/universal-starter/dist/server.js:105040:10320)
    at n (/Users/ks89/git/universal-starter/dist/server.js:105040:149)
    at Object.bNRb (/Users/ks89/git/universal-starter/dist/server.js:105040:10973)
    at n (/Users/ks89/git/universal-starter/dist/server.js:105040:149)
    at Object.JwoV (/Users/ks89/git/universal-starter/dist/server.js:105040:1956)
    at n (/Users/ks89/git/universal-starter/dist/server.js:105040:149)

edit: oh wait. I imported hammerjs in main.ts and now it is working.

[Toxicable]

superseeded by #992

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