feat: allow for literal property definition with state on classes (#11326)

closes #11316

---------

Co-authored-by: Simon Holthausen <simon.holthausen@vercel.com>

.changeset/honest-nails-share.md

@@ -0,0 +1,5 @@
+---
+"svelte": patch
+---
+
+feat: allow for literal property definition with state on classes

packages/svelte/src/compiler/phases/3-transform/client/visitors/javascript-runes.js

@@ -4,6 +4,7 @@ import * as b from '../../../../utils/builders.js';
 import * as assert from '../../../../utils/assert.js';
 import { get_prop_source, is_state_source, should_proxy_or_freeze } from '../utils.js';
 import { extract_paths } from '../../../../utils/ast.js';
+import { regex_invalid_identifier_chars } from '../../../patterns.js';
 
 /** @type {import('../types.js').ComponentVisitors} */
 export const javascript_visitors_runes = {
@@ -20,9 +21,13 @@ export const javascript_visitors_runes = {
 		for (const definition of node.body) {
 			if (
 				definition.type === 'PropertyDefinition' &&
-				(definition.key.type === 'Identifier' || definition.key.type === 'PrivateIdentifier')
+				(definition.key.type === 'Identifier' ||
+					definition.key.type === 'PrivateIdentifier' ||
+					definition.key.type === 'Literal')
 			) {
-				const { type, name } = definition.key;
+				const type = definition.key.type;
+				const name = get_name(definition.key);
+				if (!name) continue;
 
 				const is_private = type === 'PrivateIdentifier';
 				if (is_private) private_ids.push(name);
@@ -79,9 +84,12 @@ export const javascript_visitors_runes = {
 		for (const definition of node.body) {
 			if (
 				definition.type === 'PropertyDefinition' &&
-				(definition.key.type === 'Identifier' || definition.key.type === 'PrivateIdentifier')
+				(definition.key.type === 'Identifier' ||
+					definition.key.type === 'PrivateIdentifier' ||
+					definition.key.type === 'Literal')
 			) {
-				const name = definition.key.name;
+				const name = get_name(definition.key);
+				if (!name) continue;
 
 				const is_private = definition.key.type === 'PrivateIdentifier';
 				const field = (is_private ? private_state : public_state).get(name);
@@ -160,7 +168,6 @@ export const javascript_visitors_runes = {
 							);
 						}
 					}
-
 					continue;
 				}
 			}
@@ -437,3 +444,14 @@ export const javascript_visitors_runes = {
 		context.next();
 	}
 };
+
+/**
+ * @param {import('estree').Identifier | import('estree').PrivateIdentifier | import('estree').Literal} node
+ */
+function get_name(node) {
+	if (node.type === 'Literal') {
+		return node.value?.toString().replace(regex_invalid_identifier_chars, '_');
+	} else {
+		return node.name;
+	}
+}

packages/svelte/src/compiler/phases/patterns.js

@@ -15,6 +15,8 @@ export const regex_only_whitespaces = /^[ \t\n\r\f]+$/;
 export const regex_not_newline_characters = /[^\n]/g;
 
 export const regex_is_valid_identifier = /^[a-zA-Z_$][a-zA-Z_$0-9]*$/;
+// used in replace all to remove all invalid chars from a literal identifier
+export const regex_invalid_identifier_chars = /(^[^a-zA-Z_$]|[^a-zA-Z0-9_$])/g;
 
 export const regex_starts_with_vowel = /^[aeiou]/;
 export const regex_heading_tags = /^h[1-6]$/;

packages/svelte/tests/runtime-runes/samples/class-state-with-literal/_config.js

@@ -0,0 +1,15 @@
+import { test } from '../../test';
+
+export default test({
+	html: `<button>false</button>`,
+
+	async test({ assert, target }) {
+		const btn = target.querySelector('button');
+
+		await btn?.click();
+		assert.htmlEqual(target.innerHTML, `<button>true</button>`);
+
+		await btn?.click();
+		assert.htmlEqual(target.innerHTML, `<button>false</button>`);
+	}
+});

packages/svelte/tests/runtime-runes/samples/class-state-with-literal/main.svelte

@@ -0,0 +1,12 @@
+<script>
+	class Toggle {
+		"aria-pressed" = $state(false);
+
+		toggle(){
+			this["aria-pressed"] = !this["aria-pressed"]
+		}
+	}
+	const toggle = new Toggle();
+</script>
+
+<button on:click={() => toggle.toggle()}>{toggle["aria-pressed"]}</button>