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Docs: Update type-casting of "self" without re-declaration in service-worker #13624

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Docs: Update type-casting of "self" without re-declaration in service-worker #13624

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6 changes: 3 additions & 3 deletions documentation/docs/30-advanced/40-service-workers.md
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Original file line number Diff line number Diff line change
Expand Up @@ -132,18 +132,18 @@ Setting up proper types for service workers requires some manual setup. Inside y
/// <reference lib="esnext" />
/// <reference lib="webworker" />

const sw = /** @type {ServiceWorkerGlobalScope} */ (/** @type {unknown} */ (self));
/** @typedef {ServiceWorkerGlobalScope} self */
```
```generated-ts
/// <reference types="@sveltejs/kit" />
/// <reference no-default-lib="true"/>
/// <reference lib="esnext" />
/// <reference lib="webworker" />

const sw = self as unknown as ServiceWorkerGlobalScope;
declare const self: ServiceWorkerGlobalScope;
```

This disables access to DOM typings like `HTMLElement` which are not available inside a service worker and instantiates the correct globals. The reassignment of `self` to `sw` allows you to type cast it in the process (there are a couple of ways to do this, but this is the easiest that requires no additional files). Use `sw` instead of `self` in the rest of the file. The reference to the SvelteKit types ensures that the `$service-worker` import has proper type definitions. If you import `$env/static/public` you either have to `// @ts-ignore` the import or add `/// <reference types="../.svelte-kit/ambient.d.ts" />` to the reference types.
This disables access to DOM typings like `HTMLElement` which are not available inside a service worker and instantiates the correct globals. The reference to the SvelteKit types ensures that the `$service-worker` import has proper type definitions. If you import `$env/static/public` you either have to `// @ts-ignore` the import or add `/// <reference types="../.svelte-kit/ambient.d.ts" />` to the reference types.

## Other solutions

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