move constants to top of file and rename with a11y prefix

src/compiler/compile/nodes/Element.ts

@@ -70,6 +70,47 @@ const a11y_labelable = new Set([
 	'textarea'
 ]);
 
+const a11y_nested_implicit_semantics = new Map([
+	['header', 'banner'],
+	['footer', 'contentinfo']
+]);
+
+const a11y_implicit_semantics = new Map([
+	['a', 'link'],
+	['article', 'article'],
+	['aside', 'complementary'],
+	['body', 'document'],
+	['datalist', 'listbox'],
+	['dd', 'definition'],
+	['dfn', 'term'],
+	['details', 'group'],
+	['dt', 'term'],
+	['fieldset', 'group'],
+	['form', 'form'],
+	['h1', 'heading'],
+	['h2', 'heading'],
+	['h3', 'heading'],
+	['h4', 'heading'],
+	['h5', 'heading'],
+	['h6', 'heading'],
+	['hr', 'separator'],
+	['li', 'listitem'],
+	['menu', 'list'],
+	['nav', 'navigation'],
+	['ol', 'list'],
+	['optgroup', 'group'],
+	['output', 'status'],
+	['progress', 'progressbar'],
+	['section', 'region'],
+	['summary', 'button'],
+	['tbody', 'rowgroup'],
+	['textarea', 'textbox'],
+	['tfoot', 'rowgroup'],
+	['thead', 'rowgroup'],
+	['tr', 'row'],
+	['ul', 'list']
+]);
+
 const invisible_elements = new Set(['meta', 'html', 'script', 'style']);
 
 const valid_modifiers = new Set([
@@ -370,56 +411,16 @@ export default class Element extends Node {
 				}
 
 				// no-redundant-roles
-				const implicit_semantics = new Map([
-					['a', 'link'],
-					['article', 'article'],
-					['aside', 'complementary'],
-					['body', 'document'],
-					['datalist', 'listbox'],
-					['dd', 'definition'],
-					['dfn', 'term'],
-					['details', 'group'],
-					['dt', 'term'],
-					['fieldset', 'group'],
-					['form', 'form'],
-					['h1', 'heading'],
-					['h2', 'heading'],
-					['h3', 'heading'],
-					['h4', 'heading'],
-					['h5', 'heading'],
-					['h6', 'heading'],
-					['hr', 'separator'],
-					['li', 'listitem'],
-					['menu', 'list'],
-					['nav', 'navigation'],
-					['ol', 'list'],
-					['optgroup', 'group'],
-					['output', 'status'],
-					['progress', 'progressbar'],
-					['section', 'region'],
-					['summary', 'button'],
-					['tbody', 'rowgroup'],
-					['textarea', 'textbox'],
-					['tfoot', 'rowgroup'],
-					['thead', 'rowgroup'],
-					['tr', 'row'],
-					['ul', 'list']
-				]);
-
-				const has_redundant_role = value === implicit_semantics.get(this.name);
+				const has_redundant_role = value === a11y_implicit_semantics.get(this.name);
 
 				if (this.name === value || has_redundant_role) {
 					component.warn(attribute, compiler_warnings.a11y_no_redundant_roles(value));
 				}
 
 				// Footers and headers are special cases, and should not have redundant roles unless they are the children of sections or articles.
-				const nested_implicit_semantics = new Map([
-					['header', 'banner'],
-					['footer', 'contentinfo']
-				]);
 				const is_parent_section_or_article = is_parent(this.parent, ['section', 'article']);
 				if (!is_parent_section_or_article) {
-					const has_nested_redundant_role = value === nested_implicit_semantics.get(this.name);
+					const has_nested_redundant_role = value === a11y_nested_implicit_semantics.get(this.name);
 					if (has_nested_redundant_role) {
 						component.warn(attribute, compiler_warnings.a11y_no_redundant_roles(value));
 					}