feat(valid-langs): deprecate validLangs, add isValidLangs, reduce fil…

…e size (#2527)

* feat(valid-langs): deprecate validLangs, add isValidLangs, reduce file size

* no prettier

* comment typo

* fix external api integration test

* comment at top

* fix ie11

* Update lib/core/utils/valid-langs.js

Co-authored-by: Wilco Fiers <WilcoFiers@users.noreply.github.com>

* update list

Co-authored-by: Wilco Fiers <WilcoFiers@users.noreply.github.com>

lib/checks/language/valid-lang-evaluate.js

@@ -1,9 +1,7 @@
-import { validLangs, getBaseLang } from '../../core/utils';
+import { isValidLang, getBaseLang } from '../../core/utils';
 import { sanitize } from '../../commons/text';
 
 function validLangEvaluate(node, options, virtualNode) {
-	const langs = (options.value ? options.value : validLangs()).map(getBaseLang);
-
 	const invalid = [];
 	options.attributes.forEach(langAttr => {
 		const langVal = virtualNode.attr(langAttr);
@@ -12,11 +10,14 @@ function validLangEvaluate(node, options, virtualNode) {
 		}
 
 		const baselangVal = getBaseLang(langVal);
+		const invalidLang = options.value
+			? !options.value.map(getBaseLang).includes(baselangVal)
+			: !isValidLang(baselangVal);
 
 		// Edge sets lang to an empty string when xml:lang is set
 		// so we need to ignore empty strings here
 		if (
-			(baselangVal !== '' && langs.indexOf(baselangVal) === -1) ||
+			(baselangVal !== '' && invalidLang) ||
 			// whitespace only lang value is invalid
 			(langVal !== '' && !sanitize(langVal))
 		) {

lib/core/utils/index.js

@@ -74,4 +74,4 @@ export { default as toArray } from './to-array';
 export { default as tokenList } from './token-list';
 export { default as uniqueArray } from './unique-array';
 export { default as validInputTypes } from './valid-input-type';
-export { default as validLangs } from './valid-langs';
+export { default as isValidLang, validLangs } from './valid-langs';