Allow to specify TS target using parserOptions (#375)

Co-authored-by: Yosuke Ota <[email protected]>

Author: ptrxyz

.changeset/many-cougars-act.md

@@ -0,0 +1,6 @@
+---
+"eslint-plugin-svelte": minor
+---
+
+Change to use `parserServices.program.getCompilerOptions().target` for TS transpile in `svelte/valid-compile` rule.
+

src/shared/svelte-compile-warns/transform/typescript.ts

@@ -29,7 +29,10 @@ export function transform(
     const output = ts.transpileModule(code, {
       reportDiagnostics: false,
       compilerOptions: {
-        target: ts.ScriptTarget.ESNext,
+        target:
+          context.parserServices.program?.getCompilerOptions()?.target ||
+          ts.ScriptTarget.ESNext,
+        module: ts.ModuleKind.ESNext,
         importsNotUsedAsValues: ts.ImportsNotUsedAsValues.Preserve,
         sourceMap: true,
       },