Fix isStringKeySafeToUnquote (#16058)

changelog_unreleased/javascript/16058.md

@@ -0,0 +1,16 @@
+#### Fix unstable object print (#16058 by @fisker)
+
+<!-- prettier-ignore -->
+```jsx
+// Input
+a = {"\a": 1, "b": 2}
+
+// Prettier stable (--quote-props consistent)
+a = { "a": 1, "b": 2 };
+
+// Prettier stable (--quote-props as-needed)
+a = { "a": 1, b: 2 };
+
+// Prettier main
+a = { a: 1, b: 2 };
+```

src/language-js/print/property.js

@@ -44,8 +44,7 @@ function isStringKeySafeToUnquote(node, options) {
     options.parser === "json" ||
     options.parser === "jsonc" ||
     !isStringLiteral(node.key) ||
-    // TODO[@fisker]: Use `printString` instead
-    rawText(node.key).slice(1, -1) !== node.key.value
+    printString(rawText(node.key), options).slice(1, -1) !== node.key.value
   ) {
     return false;
   }