Fix swift.spec.js

Since highlight.js 11.6+, the `distributed` keyword is built-in and no
custom overrides are needed

Author: marinaaisa

src/utils/custom-highlight-lang/swift.js

@@ -13,34 +13,6 @@ import swift from 'highlight.js/lib/languages/swift';
 export default function swiftOverride(hljs) {
   const language = swift(hljs);
 
-  // Temporarily patch the Swift language syntax to recognize `distributed` as
-  // a keyword until the next version of highlight.js (v11.6) is released, which
-  // will have built-in support for this [1]
-  //
-  // [1]: https://github.com/highlightjs/highlight.js/pull/3523
-  language.keywords.keyword = [
-    ...language.keywords.keyword,
-    'distributed',
-  ];
-
-  const isClassMode = ({ beginKeywords = '' }) => beginKeywords
-    .split(' ')
-    .includes('class');
-  const classModeIndex = language.contains.findIndex(isClassMode);
-  if (classModeIndex >= 0) {
-    const {
-      beginKeywords, // purposefully strip this out
-      ...classMode
-    } = language.contains[classModeIndex];
-    // Update the existing "class" mode by replacing the `beginKeywords` with
-    // a `begin` regular expression, which is careful not to mistakenly
-    // recognize class function declarations as class declarations
-    language.contains[classModeIndex] = {
-      ...classMode,
-      begin: /\b(struct|protocol|extension|enum|actor|class\b(?!.*\bfunc))\b/,
-    };
-  }
-
   // Checks if a given language sub-mode matches the "ESCAPED_NEWLINE" from the
   // built-in Swift parser from hljs
   const isEscapedNewlineMode = (mode) => {

tests/unit/utils/custom-highlight-lang/swift.spec.js

@@ -27,17 +27,21 @@ describe('swift', () => {
 
     beforeEach(() => {
       mode = language.contains.find(m => (
-        m.begin && m.begin.test && m.begin.test('class Foobar {')
+        Array.isArray(m.begin)
+        && m.begin.length > 0
+        && m.begin[0].test('class Foobar {')
       ));
     });
 
     it('does not have a `beginKeywords` attribute anymore', () => {
+      expect(mode).toBeDefined();
       expect(mode.beginKeywords).toBeFalsy();
     });
 
     it('does have a new `begin` attribute', () => {
-      expect(mode.begin)
-        .toEqual(/\b(struct|protocol|extension|enum|actor|class\b(?!.*\bfunc))\b/);
+      expect(mode).toBeDefined();
+      expect(Array.isArray(mode.begin)).toBe(true);
+      expect(mode.begin[0]).toEqual(/(struct|protocol|class|extension|enum|actor)/);
     });
   });
 });