Support exclusively special characters in component filenames. Fixes #7143.

src/compiler/compile/utils/__test__.ts

@@ -13,4 +13,10 @@ describe('get_name_from_filename', () => {
 	it('handles Windows filenames', () => {
 		assert.equal(get_name_from_filename('path\\to\\Widget.svelte'), 'Widget');
 	});
+
+	it('handles special characters in filenames', () => {
+		assert.equal(get_name_from_filename('@.svelte'), '_');
+		assert.equal(get_name_from_filename('&.svelte'), '_');
+		assert.equal(get_name_from_filename('~.svelte'), '_');
+	});
 });

src/compiler/compile/utils/get_name_from_filename.ts

@@ -15,8 +15,8 @@ export default function get_name_from_filename(filename: string) {
 		.replace(/%/g, 'u')
 		.replace(/\.[^.]+$/, '')
 		.replace(/[^a-zA-Z_$0-9]+/g, '_')
-		.replace(/^_/, '')
+		.replace(/^_(?=.)/, '')
-		.replace(/_$/, '')
+		.replace(/(?<=.)_$/, '')
 		.replace(/^(\d)/, '_$1');
 
 	if (!base) {