Support for @rollup/plugin-alias

[bensleveritt]

I see rollup-plugin-import-resolver is supported (#10), and I'm not sure how the resolution strategy works, but svelte-intellisense doesn't work with @rollup/plugin-alias AFAICT.

If someone could illuminate on the strategy, I might be able to help fix it.

With aliasing:

Without aliasing:

Where the relevant part of the rollup config is simply:

alias({
        entries: { components: 'src/components', content: 'src/content' },
      }),

[bensleveritt]

Just realised that the resolution strategy might work from VS Code's config.

I also have the aliases setup in a jsconfig.json:

...
  "compilerOptions": {
    "baseUrl": ".",
    "paths": {
      "components/*": ["./src/components/*"],
      "content/*": ["./src/content/*"]
    }
  },
...