Always define embed.getVisitorKeys

This feels like it should not be necessary so I don’t think this fix is right. Need to dive into the Prettier source to figure out why its getting called.

Author: thecrypticace

src/index.ts

@@ -1116,6 +1116,25 @@ export const printers: Record<string, Printer> = (function () {
       return base.printers['svelte-ast'].embed(path, options)
     }
 
+    //
+    //  Prettier v3.7 compat
+    //  This isn't in the types but its expected at runtime
+    //
+
+    embed.getVisitorKeys = (node: any, nonTraversableKeys?: Set<string>) => {
+      // @ts-ignore
+      if (base.printers['svelte-ast'].embed && base.printers['svelte-ast'].embed.getVisitorKeys) {
+        // @ts-ignore
+        return base.printers['svelte-ast'].embed!.getVisitorKeys(node, nonTraversableKeys ?? new Set())
+      }
+
+      if (base.printers['svelte-ast'].getVisitorKeys) {
+        return base.printers['svelte-ast'].getVisitorKeys(node, nonTraversableKeys ?? new Set())
+      }
+
+      return []
+    }
+
     printers['svelte-ast'] = {
       ...original,
       print,