Support for SvelteKit projects

[rossyman]

As it stands, Vite-Jest has baked in support for React and Vue. See here:

https://github.com/sodatea/vite-jest/blob/6cb71219d13dfced3dbb0a2a6df3e437d80d9849/packages/vite-jest/jest-preset.js#L7

Myself and @FractalHQ are working on an "adder" that enables developers to introduce Jest tests to their SvelteKit project. We've recently encountered a similar issue to that faced by Vue and React developers, relating to Jest/Vite nuances. See here:

We've got a similar discussion going on in our repo, relating to us utilising vite-jest in our adder:

• https://github.com/rossyman/svelte-add-jest/issues/14

The two key points I'd like to address, are the following:

• What changes would be needed to add svelte support to vite-jest (Relating to transformers, etc)
• Are there any limitations that prevent us from applying vite-jest to svelte, due to the nature of how .svelte components are created?
• Would we need to do these changes in co-ordination with another transformer such as svelte-jester to ensure that the .svelte extension is correctly transformed.

[benmccann]

Perhaps this list should match the list that's in Vite itself? https://github.com/vitejs/vite/pull/3128/files#diff-071a32aedd2ea59472ebb69fb456e818b103d1a332da632e12c2d54395938ad1L109

@dominikg has a PR open to make the list more configurable in Vite core https://github.com/vitejs/vite/pull/3828

[benmccann]

The import.meta issue is also mentioned in https://github.com/sodatea/vite-jest/issues/14

https://github.com/sodatea/vite-jest/issues/17 is a bit different, but also related to ESM vs non-ESM code (the error message in that one is Cannot use import statement outside a module)