Create sveltekit-sync.md

learnings/sveltekit-sync.md

@@ -0,0 +1,27 @@
+# SvelteKit Sync
+
+`svelte-kit sync` creates the tsconfig.json and all generated types for your project. This is useful because Sveltekit has [generated types](https://kit.svelte.dev/docs/types#generated-types).
+
+Example:
+
+```tsx
+import { API_KEY } from '$env/static/private';
+// ^? Module '"$env/static/private"' has no exported member 'API_KEY'.
+```
+
+Running `svelte-kit sync` will generate the correct types and remove the error:
+
+```tsx
+import { API_KEY } from '$env/static/private';
+// ^? (alias) const API_KEY: string
+```
+
+You'll find the generated types under the `.svelte-kit` folder. Here is the one for environment variables:
+
+```tsx
+// .svelte-kit/ambient.d.ts
+declare module '$env/static/private' {
+	export const API_KEY: string;
+  ...
+}
+```