Allowing for modes on a11y

[plutoniumm]

Describe the problem

When building applications, I often don't need A11y since I know it will just be me on the other end of the app. There are times when I know that A11y will be THE main feature. Due to this distinct range, I can see why Svelte's A11y is slightly aggressive but not by a lot.

So it'll be nice to have modes enabled in the (vite|svelte).config.js file where the default is current settings, and otherwise, I can select the sensitivity of A11y

Describe the proposed solution

// vite.config.js 
const config = defineConfig( {
	plugins: [ svelte( {
		a11y: 'off' // or 'strict' or 'default'
	} ) ],
} );

So here when off, it would turn off ALL a11y features, including img alt, whereas when strict may in some way ask for aria-x per component. I can see that is very non-trivial to decide at what SCALE to implement A11y since people may make a component for a part of a card which may not really need an A11y, but I think we can resolve that with some community input

Alternatives considered

I did look for alternatives, as extensions as such, but there don't really exist lightweight ones/ ones with sensible defaults. Additionally, this is going to be a svelte compiler modifying behaviour and will modify only a small part of the system namely the warnings generated by the compiler

Currently I resort to using a combination of eslint and/or turning off warnings as needed

Importance

would make my life easier

PS: I'm willing to contribute/help out in anyway i can

[j3rem1e]

Imo a11y warning should be part of the eslint plugin.