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Jun 8, 2020
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Document how to declare reactive variable type #4973

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8 changes: 7 additions & 1 deletion site/content/faq/500-what-about-typescript-support.md
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question: What about Typescript support?
---

You need to install a [community supported preprocessor](https://github.com/sveltejs/integrations#preprocessors) such as [svelte-preprocess](https://github.com/kaisermann/svelte-preprocess). Work is ongoing to improve [IDE support](https://github.com/sveltejs/language-tools/issues/83). You can also run type checking from command line with [svelte-check](https://www.npmjs.com/package/svelte-check).
You need to install a [community supported preprocessor](https://github.com/sveltejs/integrations#preprocessors) such as [svelte-preprocess](https://github.com/kaisermann/svelte-preprocess). Work is ongoing to improve [IDE support](https://github.com/sveltejs/language-tools/issues/83). You can also run type checking from the command line with [svelte-check](https://www.npmjs.com/package/svelte-check).

To declare the type of a reactive variable in a Svelte template, you can use the following syntax:
```
let x: number;
$: x = count + 1;
```