feat: pass filename to migrate (#12749)

* feat: pass filename to `migrate`

* chore: changeset

* chore: adapt with new changes from PR

Author: paoloricciuti

.changeset/dry-feet-wink.md

@@ -0,0 +1,5 @@
+---
+'svelte-migrate': minor
+---
+
+feat: pass filename to `migrate` to allow for `svelte:self` migration

packages/migrate/migrations/svelte-5/index.js

@@ -143,7 +143,7 @@ export async function migrate() {
 		if (extensions.some((ext) => file.endsWith(ext))) {
 			if (svelte_extensions.some((ext) => file.endsWith(ext))) {
 				update_svelte_file(file, transform_module_code, (code) =>
-					transform_svelte_code(code, migrate)
+					transform_svelte_code(code, migrate, { filename: file })
 				);
 			} else {
 				update_js_file(file, transform_module_code);

packages/migrate/migrations/svelte-5/migrate.js

@@ -55,10 +55,11 @@ export function transform_module_code(code) {
 
 /**
  * @param {string} code
- * @param {(source: code) => { code: string }} transform_code
+ * @param {(source: string, options: { filename?: string }) => { code: string }} transform_code
+ * @param {{ filename?: string }} options
  */
-export function transform_svelte_code(code, transform_code) {
-	return transform_code(code).code;
+export function transform_svelte_code(code, transform_code, options) {
+	return transform_code(code, options).code;
 }
 
 /**