fix: false positives for import vars with TS in svelte/valid-compile (

#790)

close #652

This PR fixes the issue mentioned in the comments below.


#652 (comment)

In the code posted at the top of the thread the rule seems to work
correctly, and correctly shows the svelte compiler warnings.

.changeset/ninety-lobsters-dress.md

@@ -0,0 +1,5 @@
+---
+"eslint-plugin-svelte": patch
+---
+
+fix: false positives for import vars with TS in `svelte/valid-compile`

packages/eslint-plugin-svelte/src/shared/svelte-compile-warns/transform/typescript.ts

@@ -35,6 +35,7 @@ export function transform(
 					ts.ScriptTarget.ESNext,
 				module: ts.ModuleKind.ESNext,
 				importsNotUsedAsValues: ts.ImportsNotUsedAsValues.Preserve,
+				preserveValueImports: true,
 				sourceMap: true
 			}
 		});

packages/eslint-plugin-svelte/tests/fixtures/rules/valid-compile/valid/ts/ts-unused-in-script-input.svelte

@@ -0,0 +1,5 @@
+<script lang="ts">
+	import { page } from '$app/stores';
+</script>
+
+{$page}