feat: Support LaTeX and AsciiMath via MathJax on stem.excalidraw.com

src/i18n.ts

@@ -82,6 +82,22 @@ if (process.env.NODE_ENV === ENV.DEVELOPMENT) {
 let currentLang: Language = defaultLang;
 let currentLangData = {};
 
+const auxCurrentLangData = Array<Object>();
+const auxFallbackLangData = Array<Object>();
+const auxSetLanguageFuncs =
+  Array<(langCode: string) => Promise<Object | undefined>>();
+
+export const registerAuxLangData = (
+  fallbackLangData: Object,
+  setLanguageAux: (langCode: string) => Promise<Object | undefined>,
+) => {
+  if (auxFallbackLangData.includes(fallbackLangData)) {
+    return;
+  }
+  auxFallbackLangData.push(fallbackLangData);
+  auxSetLanguageFuncs.push(setLanguageAux);
+};
+
 export const setLanguage = async (lang: Language) => {
   currentLang = lang;
   document.documentElement.dir = currentLang.rtl ? "rtl" : "ltr";
@@ -94,6 +110,17 @@ export const setLanguage = async (lang: Language) => {
       currentLangData = await import(
         /* webpackChunkName: "locales/[request]" */ `./locales/${currentLang.code}.json`
       );
+      // Empty the auxCurrentLangData array
+      while (auxCurrentLangData.length > 0) {
+        auxCurrentLangData.pop();
+      }
+      // Fill the auxCurrentLangData array with each locale file found in auxLangDataRoots for this language
+      auxSetLanguageFuncs.forEach(async (setLanguageFn) => {
+        const condData = await setLanguageFn(currentLang.code);
+        if (condData) {
+          auxCurrentLangData.push(condData);
+        }
+      });
     } catch (error: any) {
       console.error(`Failed to load language ${lang.code}:`, error.message);
       currentLangData = fallbackLangData;
@@ -132,6 +159,13 @@ export const t = (
   let translation =
     findPartsForData(currentLangData, parts) ||
     findPartsForData(fallbackLangData, parts);
+  const auxData = Array<Object>().concat(
+    auxCurrentLangData,
+    auxFallbackLangData,
+  );
+  for (let i = 0; i < auxData.length; i++) {
+    translation = translation || findPartsForData(auxData[i], parts);
+  }
   if (translation === undefined) {
     throw new Error(`Can't find translation for ${path}`);
   }