Check AST shape instead of parser (#18672)

src/language-js/print/assignment.js

@@ -146,9 +146,7 @@ function chooseLayout(path, options, print, leftDoc, rightPropertyName) {
     (rightNode.type === "CallExpression" &&
       rightNode.callee.name === "require") ||
     // do not put values on a separate line from the key in json
-    options.parser === "json5" ||
-    options.parser === "jsonc" ||
-    options.parser === "json"
+    path.root.type === "JsonRoot"
   ) {
     return "never-break-after-operator";
   }