Get svelte-loader working with v3 alpha

[malkomalko]

This makes some small changes to get svelte-loader working with the current v3 alpha branch.

Todo

• Fix failing tests

[Rich-Harris]

thanks! looks like the tests are failing because this'll no longer work with Svelte 1/2 — I think we can fix that by putting

const { compile, preprocess } = require('svelte/compiler');

after we've established major_version, and doing this:

const { compile, preprocess } = major_version >= 3
  ? require('svelte/compiler')
  : require('svelte');

[malkomalko]

Cool, I'll fix the tests after coffee.

[malkomalko]

This seems to be fine. I installed this with npm i svelte-loader@malkomalko/svelte-loader#svelte-v3 in my sapper project and things seem to be working. Feel free to give that a try and merge at your leisure.

[Rich-Harris]

thanks! released 2.12