From 553e9bb1ac528dd8d44bfd8c621d2002382f9d61 Mon Sep 17 00:00:00 2001
From: Ika <ikatyang@gmail.com>
Date: Mon, 21 May 2018 18:57:30 +0800
Subject: [PATCH] fix(typescript): preserve quoted class property (#4517)

---
 src/language-js/printer-estree.js                     |  3 ++-
 .../typescript_class/__snapshots__/jsfmt.spec.js.snap | 11 +++++++++++
 tests/typescript_class/quoted-property.ts             |  3 +++
 3 files changed, 16 insertions(+), 1 deletion(-)
 create mode 100644 tests/typescript_class/quoted-property.ts

diff --git a/src/language-js/printer-estree.js b/src/language-js/printer-estree.js
index 19ff14d1..09a78b2f 100644
--- a/src/language-js/printer-estree.js
+++ b/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(
diff --git a/tests/typescript_class/__snapshots__/jsfmt.spec.js.snap b/tests/typescript_class/__snapshots__/jsfmt.spec.js.snap
index 861224dd..2648f4c5 100644
--- a/tests/typescript_class/__snapshots__/jsfmt.spec.js.snap
+++ b/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;
+}
+
+`;
diff --git a/tests/typescript_class/quoted-property.ts b/tests/typescript_class/quoted-property.ts
new file mode 100644
index 00000000..d9755ac8
--- /dev/null
+++ b/tests/typescript_class/quoted-property.ts
@@ -0,0 +1,3 @@
+class User {
+    "username": string;
+}