Typescript Generics

[jycouet]

Describe the bug

In https://github.com/dummdidumm/rfcs/blob/ts-typedefs-within-svelte-components/text/ts-typing-props-slots-events.md#generics I was able to learn about generics.

I would like to have:

<script lang="ts" generics="T extends Record<string, any>">

Unfortunalty I get ERROR: Unterminated string literal. (probably due to < and > parsing).

---

Timing seems great, I'm wondering if sveltejs/svelte#9482 will not solve this at the same time?

Reproduction

https://github.com/jycouet/kit-generics

Logs

No response

System Info

System:
    OS: macOS 14.1.1
    CPU: (12) arm64 Apple M3 Pro
    Memory: 17.00 GB / 36.00 GB
    Shell: 5.9 - /bin/zsh
  Binaries:
    Node: 21.2.0 - ~/.nvm/versions/node/v21.2.0/bin/node
    npm: 10.2.3 - ~/.nvm/versions/node/v21.2.0/bin/npm
    pnpm: 8.10.5 - ~/Library/pnpm/pnpm
  Browsers:
    Chrome: 119.0.6045.123
    Safari: 17.1
  npmPackages:
    @sveltejs/adapter-auto: ^2.0.0 => 2.1.1 
    @sveltejs/kit: ^1.27.4 => 1.27.6 
    svelte: ^4.0.5 => 4.2.3 
    vite: ^4.4.2 => 4.5.0

Severity

annoyance

Additional Information

No response

[david-plugge]

You can use $$Generic:

<script lang="ts">
	type T = $$Generic<Record<string, number>>;

	export let data: T;

	export let keys: (keyof T)[];
</script>

<script lang="ts">
	import Test from './test.svelte';
</script>

<Test data={{ a: 1 }} keys={['a']}></Test>

[brunnerh]

That is deprecated syntax.

Discarded alternative 1
You use new reserved type called $$Generic.

[jycouet]

Thx @david-plugge I confirm that it's working well 👍
As @brunnerh highlighted, it's deprecated, maybe the new PR will tackle this?

In the mean time, I'm good with $$generic thx a lot

[dummdidumm]

Fixed on the language tools side, release pending - but this likely also needs changes in svelte-preprocess / svelte / any other tool that uses a regex to extract the contents of a script or style tag. The regex needs to be adjusted to handle the "> inside an attribute string" case