fix: populate globalThis with defines in Vitest

[elliott-with-the-longest-name-on-github]

Closes #16214

Sets defines on globalThis when we detect that Vitest is running, since it "helpfully" deletes them for us.

[pkg-svelte-dev]

Install the latest version of @sveltejs/kit from dc7b03c:

pnpm add https://pkg.svelte.dev/@sveltejs/kit/c/dc7b03c2b9877f0052f393e3fe16720920f8fa7f

Open in pkg.svelte.dev: https://pkg.svelte.dev/repos/kit/pr/16224

[changeset-bot]

⚠️ No Changeset found

Latest commit: dc7b03c

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes no changesets

When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types

Click here to learn what changesets are, and how to add one.

Click here if you're a maintainer who wants to add a changeset to this PR

[elliott-with-the-longest-name-on-github]

@MaddyGuthridge can you install using the pkg.svelte.dev link above and let me know if it fixes your issue? I think it should...

[svelte-docs-bot]

Preview: https://svelte-dev-git-preview-kit-16224-svelte.vercel.app/

[MaddyGuthridge]

I'll give this a go after work today

[MaddyGuthridge]

I've tried it out, but had some issues:

• This change targets v3 of svelte-kit, which means there are other breaking changes, none of which appear in the mainline documentation yet. Is a backport to the v2 branch possible?
• The JSON error mentioned by the vercel bot.

$ npm t
> kit-template-default@0.0.1 test
> vitest run


⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯ Startup Error ⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯
SyntaxError: Unexpected token 'g', "globalThis"... is not valid JSON
    at JSON.parse (<anonymous>)
    at BasicMinimalPluginContext.handler (file:///home/maddy/Downloads/sveltejs-kit-template-default-fann5ee8/node_modules/@sveltejs/kit/src/exports/vite/index.js:506:67)
    at async runConfigHook (file:///home/maddy/Downloads/sveltejs-kit-template-default-fann5ee8/node_modules/vite/dist/node/chunks/node.js:35760:15)
    at async resolveConfig (file:///home/maddy/Downloads/sveltejs-kit-template-default-fann5ee8/node_modules/vite/dist/node/chunks/node.js:35195:11)
    at async _createServer (file:///home/maddy/Downloads/sveltejs-kit-template-default-fann5ee8/node_modules/vite/dist/node/chunks/node.js:25332:65)
    at async createViteServer (file:///home/maddy/Downloads/sveltejs-kit-template-default-fann5ee8/node_modules/vitest/dist/chunks/cli-api.24X8XwN1.js:8835:17)
    at async createVitest (file:///home/maddy/Downloads/sveltejs-kit-template-default-fann5ee8/node_modules/vitest/dist/chunks/cli-api.24X8XwN1.js:14221:18)
    at async prepareVitest (file:///home/maddy/Downloads/sveltejs-kit-template-default-fann5ee8/node_modules/vitest/dist/chunks/cli-api.24X8XwN1.js:14588:14)
    at async startVitest (file:///home/maddy/Downloads/sveltejs-kit-template-default-fann5ee8/node_modules/vitest/dist/chunks/cli-api.24X8XwN1.js:14531:14)
    at async start (file:///home/maddy/Downloads/sveltejs-kit-template-default-fann5ee8/node_modules/vitest/dist/chunks/cac.D3xHeqeL.js:2340:15)

[dummdidumm]

this should target main (I briefly tried through the UI but that will try to add all of version-3, too), otherwise lgtm

[Rich-Harris]

figured it'd be easiest to just open a new PR: #16246

[Rich-Harris]

merged #16246, closing