ReferenceError: window is not defined

Describe the bug After some time (from 1.0.0-next.87) I am using SvelteKit again.

With 87 I can use console.log(window.localStorage) in $layout.svelte.

If I use the same code now (with 108) it throws with:

ReferenceError: window is not defined
  at __layout.svelte:5:43

NOTE: the default SvelteKit init demo comes without adapters, should I add one? Is this the issue?

To Reproduce

• npm init svelte@next my-app
• cd my-app
• npm install
• add console.log(window.localStorage) to __layout.svelte right before </script>
• npm run dev

Expected behavior It prints in console.

Information about your SvelteKit Installation:

Diagnostics

• The output of npx envinfo --system --npmPackages svelte,@sveltejs/kit,vite --binaries --browsers:

  System: OS: Windows 10 10.0.19042 Binaries: Node: 14.17.0 - C:\Program Files\nodejs\node.EXE npm: 7.13.0 - C:\Program Files\nodejs\npm.CMD npmPackages: @sveltejs/kit: 1.0.0-next.108 => 1.0.0-next.108 svelte: 3.38.2 => 3.38.2 vite: 2.3.3 => 2.3.3

• Your browser: Chrome 90

• Your adapter: none

Severity I cannot work.

[dummdidumm]

See https://github.com/sveltejs/kit/discussions/3365#discussioncomment-1976132

[rdela]

Re: gustavneustadt comment above for people finding this issue in the future

comment on https://github.com/sveltejs/kit/issues/4849 by mrkishi:

If you have fallback: ‘index.html’ configured, that will clash with your actual routes/index.svelte route since they’d both be rendered into index.html. You should name your fallback differently and configure your server/platform to serve it for all requests that don’t have a matching html file.

see also:

• https://github.com/sveltejs/kit/issues/5185
• https://github.com/sveltejs/kit/issues/4842
• https://github.com/sveltejs/kit/discussions/3365