fix: Narrow the type of Action.name while still allowing custom names

src/element/subtypes/index.ts

@@ -28,7 +28,7 @@ let parentTypeMap: readonly {
 }[] = [];
 let subtypeActionMap: readonly {
   subtype: Subtype;
-  actions: readonly SubtypeActionName[];
+  actions: readonly ActionName[];
 }[] = [];
 let disabledActionMap: readonly {
   subtype: Subtype;
@@ -91,7 +91,7 @@ const isDisabledActionName = (s: any): s is DisabledActionName =>
 // by `subtype` (if `isAdded` is false)?
 const isForSubtype = (
   subtype: ExcalidrawElement["subtype"],
-  actionName: ActionName | SubtypeActionName,
+  actionName: ActionName,
   isAdded: boolean,
 ) => {
   const actions = isAdded ? subtypeActionMap : disabledActionMap;
@@ -371,7 +371,12 @@ export const prepareSubtype = (
   if (record.actionNames) {
     subtypeActionMap = [
       ...subtypeActionMap,
-      { subtype, actions: record.actionNames },
+      {
+        subtype,
+        actions: record.actionNames.map(
+          (actionName) => `custom.${actionName}` as ActionName,
+        ),
+      },
     ];
   }
   if (record.disabledNames) {
@@ -383,7 +388,12 @@ export const prepareSubtype = (
   if (record.alwaysEnabledNames) {
     alwaysEnabledMap = [
       ...alwaysEnabledMap,
-      { subtype, actions: record.alwaysEnabledNames },
+      {
+        subtype,
+        actions: record.alwaysEnabledNames.map(
+          (actionName) => `custom.${actionName}` as ActionName,
+        ),
+      },
     ];
   }
   if (record.shortcutMap) {

src/element/subtypes/mathjax/implementation.tsx

@@ -1395,7 +1395,7 @@ const enableActionChangeMathProps = (
 const createMathActions = () => {
   const mathActions: Action[] = [];
   const actionUseTexTrue: Action = {
-    name: "useTexTrue",
+    name: "custom.useTexTrue",
     perform: (elements, appState) => {
       const mathOnly = getMathProps.getMathOnly(appState);
       const customData = appState.customData ?? {};
@@ -1414,7 +1414,7 @@ const createMathActions = () => {
     trackEvent: false,
   };
   const actionUseTexFalse: Action = {
-    name: "useTexFalse",
+    name: "custom.useTexFalse",
     perform: (elements, appState) => {
       const mathOnly = getMathProps.getMathOnly(appState);
       const customData = appState.customData ?? {};
@@ -1433,7 +1433,7 @@ const createMathActions = () => {
     trackEvent: false,
   };
   const actionResetUseTex: Action = {
-    name: "resetUseTex",
+    name: "custom.resetUseTex",
     perform: (elements, appState) => {
       const useTex = getMathProps.getUseTex(appState);
       const modElements = changeProperty(
@@ -1481,7 +1481,7 @@ const createMathActions = () => {
     trackEvent: false,
   };
   const actionChangeMathOnly: Action = {
-    name: "changeMathOnly",
+    name: "custom.changeMathOnly",
     perform: (elements, appState, mathOnly: boolean | null) => {
       if (mathOnly === null) {
         mathOnly = getFormValue(