Minor refactor to markdown embed print (#18518)

src/language-markdown/embed.js

@@ -6,29 +6,39 @@ import { getFencedCodeBlockValue } from "./utilities.js";
 function embed(path, options) {
   const { node } = path;
 
-  if (node.type === "code" && node.lang !== null) {
-    const parser = inferParser(options, { language: node.lang });
-    if (parser) {
+  switch (node.type) {
+    case "code": {
+      const { lang: language } = node;
+      if (!language) {
+        return;
+      }
+
+      const parser = inferParser(options, { language });
+      if (!parser) {
+        return;
+      }
+
       return async (textToDoc) => {
-        const styleUnit = options.__inJsTemplate ? "~" : "`";
-        const style = styleUnit.repeat(
-          Math.max(3, getMaxContinuousCount(node.value, styleUnit) + 1),
-        );
-        const newOptions = { parser };
+        const textToDocOptions = { parser };
 
         // Override the filepath option.
         // This is because whether the trailing comma of type parameters
         // should be printed depends on whether it is `*.ts` or `*.tsx`.
         // https://github.com/prettier/prettier/issues/15282
-        if (node.lang === "ts" || node.lang === "typescript") {
-          newOptions.filepath = "dummy.ts";
-        } else if (node.lang === "tsx") {
-          newOptions.filepath = "dummy.tsx";
+        if (language === "ts" || language === "typescript") {
+          textToDocOptions.filepath = "dummy.ts";
+        } else if (language === "tsx") {
+          textToDocOptions.filepath = "dummy.tsx";
         }
 
         const doc = await textToDoc(
           getFencedCodeBlockValue(node, options.originalText),
-          newOptions,
+          textToDocOptions,
+        );
+
+        const styleUnit = options.__inJsTemplate ? "~" : "`";
+        const style = styleUnit.repeat(
+          Math.max(3, getMaxContinuousCount(node.value, styleUnit) + 1),
         );
 
         return markAsRoot([
@@ -42,9 +52,7 @@ function embed(path, options) {
         ]);
       };
     }
-  }
 
-  switch (node.type) {
     // MDX
     case "import":
     case "export":