fix(typescript): preserve quoted class property (#4517)

src/language-js/printer-estree.js

@@ -3247,7 +3247,8 @@ function printPropertyKey(path, options, print) {
     isStringLiteral(key) &&
     isIdentifierName(key.value) &&
     !node.computed &&
-    options.parser !== "json"
+    options.parser !== "json" &&
+    !(options.parser === "typescript" && node.type === "ClassProperty")
   ) {
     // 'a' -> a
     return path.call(

tests/typescript_class/__snapshots__/jsfmt.spec.js.snap

@@ -171,3 +171,14 @@ class X {
 }
 
 `;
+
+exports[`quoted-property.ts 1`] = `
+class User {
+    "username": string;
+}
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+class User {
+  "username": string;
+}
+
+`;

tests/typescript_class/quoted-property.ts

@@ -0,0 +1,3 @@
+class User {
+    "username": string;
+}