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# Svelte + TS + Vite |
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This template should help get you started developing with Svelte and TypeScript in Vite. |
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## Recommended IDE Setup |
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[VS Code](https://code.visualstudio.com/) + [Svelte](https://marketplace.visualstudio.com/items?itemName=svelte.svelte-vscode). |
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## Need an official Svelte framework? |
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Check out [SvelteKit](https://github.com/sveltejs/kit#readme), which is also powered by Vite. Deploy anywhere with its serverless-first approach and adapt to various platforms, with out of the box support for TypeScript, SCSS, and Less, and easily-added support for mdsvex, GraphQL, PostCSS, Tailwind CSS, and more. |
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## Technical considerations |
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**Why use this over SvelteKit?** |
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- It brings its own routing solution which might not be preferable for some users. |
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- It is first and foremost a framework that just happens to use Vite under the hood, not a Vite app. |
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This template contains as little as possible to get started with Vite + TypeScript + Svelte, while taking into account the developer experience with regards to HMR and intellisense. It demonstrates capabilities on par with the other `create-vite` templates and is a good starting point for beginners dipping their toes into a Vite + Svelte project. |
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Should you later need the extended capabilities and extensibility provided by SvelteKit, the template has been structured similarly to SvelteKit so that it is easy to migrate. |
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**Why `global.d.ts` instead of `compilerOptions.types` inside `jsconfig.json` or `tsconfig.json`?** |
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Setting `compilerOptions.types` shuts out all other types not explicitly listed in the configuration. Using triple-slash references keeps the default TypeScript setting of accepting type information from the entire workspace, while also adding `svelte` and `vite/client` type information. |
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**Why include `.vscode/extensions.json`?** |
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Other templates indirectly recommend extensions via the README, but this file allows VS Code to prompt the user to install the recommended extension upon opening the project. |
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**Why enable `allowJs` in the TS template?** |
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While `allowJs: false` would indeed prevent the use of `.js` files in the project, it does not prevent the use of JavaScript syntax in `.svelte` files. In addition, it would force `checkJs: false`, bringing the worst of both worlds: not being able to guarantee the entire codebase is TypeScript, and also having worse typechecking for the existing JavaScript. In addition, there are valid use cases in which a mixed codebase may be relevant. |
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**Why is HMR not preserving my local component state?** |
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HMR state preservation comes with a number of gotchas! It has been disabled by default in both `svelte-hmr` and `@sveltejs/vite-plugin-svelte` due to its often surprising behavior. You can read the details [here](https://github.com/rixo/svelte-hmr#svelte-hmr). |
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If you have state that's important to retain within a component, consider creating an external store which would not be replaced by HMR. |
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```ts |
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// store.ts |
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// An extremely simple external store |
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import { writable } from 'svelte/store' |
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export default writable(0) |
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``` |
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