Use correct highlight.js call

Previous call signature was deprecated.

See highlightjs/highlight.js#2277

Signed-off-by: Clark Fischer <clark.fischer@gmail.com>

src/components/views/elements/SyntaxHighlight.tsx

@@ -1,5 +1,6 @@
 /*
 Copyright 2017 Michael Telatynski <7t3chguy@gmail.com>
+Copyright 2023 The Matrix.org Foundation C.I.C.
 
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
@@ -25,7 +26,7 @@ interface IProps {
 export default class SyntaxHighlight extends React.PureComponent<IProps> {
     public render(): JSX.Element {
         const { children: content, language } = this.props;
-        const highlighted = language ? hljs.highlight(language, content) : hljs.highlightAuto(content);
+        const highlighted = language ? hljs.highlight(content, { language }) : hljs.highlightAuto(content);
 
         return (
             <pre className={`mx_SyntaxHighlight hljs language-${highlighted.language}`}>

test/components/views/elements/SyntaxHighlight-test.tsx

@@ -0,0 +1,38 @@
+/* eslint @typescript-eslint/no-unused-vars: ["error", { "varsIgnorePattern": "^_" }] */
+/*
+Copyright 2023 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import { render } from "@testing-library/react";
+import hljs from "highlight.js";
+import React from "react";
+
+import SyntaxHighlight from "../../../../src/components/views/elements/SyntaxHighlight";
+
+describe("<SyntaxHighlight />", () => {
+    it("renders", () => {
+        const { container } = render(<SyntaxHighlight>console.log("Hello, World!");</SyntaxHighlight>);
+        expect(container).toMatchSnapshot();
+    });
+
+    it.each(["json", "javascript", "css"])("uses the provided language", (lang) => {
+        const mock = jest.spyOn(hljs, "highlight");
+
+        render(<SyntaxHighlight language={lang}>// Hello, World</SyntaxHighlight>);
+
+        const [_lang, opts] = mock.mock.lastCall!;
+        expect(opts["language"]).toBe(lang);
+    });
+});

test/components/views/elements/__snapshots__/SyntaxHighlight-test.tsx.snap

@@ -0,0 +1,30 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`<SyntaxHighlight /> renders 1`] = `
+<div>
+  <pre
+    class="mx_SyntaxHighlight hljs language-arcade"
+  >
+    <code>
+      <span
+        class="hljs-built_in"
+      >
+        console
+      </span>
+      .
+      <span
+        class="hljs-built_in"
+      >
+        log
+      </span>
+      (
+      <span
+        class="hljs-string"
+      >
+        "Hello, World!"
+      </span>
+      );
+    </code>
+  </pre>
+</div>
+`;