feat(prefer-svelte-reactivity): added support for ES class element accessibility

Author: marekdedic

packages/eslint-plugin-svelte/src/rules/prefer-svelte-reactivity.ts

@@ -320,13 +320,13 @@ function isPropertyEncapsulated(
 	returnedFunctionCalls: Map<FunctionLike, TSESTree.MethodDefinition[]>,
 	returnedVariables: Map<FunctionLike, VariableLike[]>
 ): boolean {
-	if (node.accessibility === 'public') {
+	if (isPublic(node)) {
 		return false;
 	}
 	for (const classElement of node.parent.body) {
 		if (
 			classElement.type === 'MethodDefinition' &&
-			classElement.accessibility === 'public' &&
+			isPublic(classElement) &&
 			methodReturnsProperty(classElement, node, returnedFunctionCalls, returnedVariables)
 		) {
 			return false;
@@ -335,6 +335,10 @@ function isPropertyEncapsulated(
 	return true;
 }
 
+function isPublic(node: TSESTree.MethodDefinition | TSESTree.PropertyDefinition): boolean {
+	return node.accessibility === undefined || node.accessibility === 'public';
+}
+
 function isDateMutable(referenceTracker: ReferenceTracker, ctorNode: TSESTree.Expression): boolean {
 	return !referenceTracker
 		.iteratePropertyReferences(ctorNode, {