Move code for loading MathJax v3 into the editor core (#11433)

GitOrigin-RevId: 14adc6c35d511d6737d0f3b8c0adec00d8a0abb6

services/web/frontend/js/features/chat/components/message-content.tsx

@@ -1,9 +1,9 @@
 import { useRef, useEffect, type FC } from 'react'
 // @ts-ignore
 import Linkify from 'react-linkify'
-import { loadMathJax } from '../../../../../modules/source-editor/frontend/js/utils/mathjax'
 import useIsMounted from '../../../shared/hooks/use-is-mounted'
 import { configureMathJax } from '../../mathjax/configure'
+import { loadMathJax } from '../../mathjax/load-mathjax'
 
 const MessageContent: FC<{ content: string }> = ({ content }) => {
   const root = useRef<HTMLDivElement | null>(null)

services/web/frontend/js/features/mathjax/load-mathjax.ts

@@ -0,0 +1,55 @@
+import getMeta from '../../utils/meta'
+
+let mathJaxPromise: Promise<typeof window.MathJax>
+
+export const loadMathJax = async () => {
+  if (!mathJaxPromise) {
+    mathJaxPromise = new Promise((resolve, reject) => {
+      // https://docs.mathjax.org/en/v3.2-latest/upgrading/v2.html
+      window.MathJax = {
+        // https://docs.mathjax.org/en/latest/options/input/tex.html#the-configuration-block
+        tex: {
+          inlineMath: [
+            ['\\(', '\\)'],
+            ['$', '$'],
+          ],
+          displayMath: [
+            ['\\[', '\\]'],
+            ['$$', '$$'],
+          ],
+          packages: {
+            '[-]': [
+              'html', // avoid creating HTML elements/attributes
+              'require', // prevent loading disabled packages
+            ],
+          },
+          processEscapes: true,
+          processEnvironments: true,
+        },
+        loader: {
+          load: [
+            'ui/safe', // https://docs.mathjax.org/en/latest/options/safe.html
+          ],
+        },
+        options: {
+          enableMenu: false, // https://docs.mathjax.org/en/latest/options/menu.html
+        },
+        startup: {
+          typeset: false,
+        },
+      }
+
+      const script = document.createElement('script')
+      script.src = getMeta('ol-mathJax3Path')
+      script.addEventListener('load', async () => {
+        await window.MathJax.startup.promise
+        document.head.appendChild(window.MathJax.svgStylesheet())
+        resolve(window.MathJax)
+      })
+      script.addEventListener('error', reject)
+      document.head.append(script)
+    })
+  }
+
+  return mathJaxPromise
+}