From af612db8c3ab22111d2b63330b9abd7a45f1ae8c Mon Sep 17 00:00:00 2001
From: Ananda Umamil <zweimach@zweimach.org>
Date: Fri, 25 Sep 2020 20:16:28 +0700
Subject: [PATCH] Fix `@babel/generator` does not print decorators of private
 properties (#12081)

---
 packages/babel-generator/src/generators/classes.js       | 1 +
 .../test/fixtures/decorators/private-props/input.js      | 7 +++++++
 .../test/fixtures/decorators/private-props/options.json  | 9 +++++++++
 .../test/fixtures/decorators/private-props/output.js     | 6 ++++++
 4 files changed, 23 insertions(+)
 create mode 100644 packages/babel-generator/test/fixtures/decorators/private-props/input.js
 create mode 100644 packages/babel-generator/test/fixtures/decorators/private-props/options.json
 create mode 100644 packages/babel-generator/test/fixtures/decorators/private-props/output.js

diff --git a/packages/babel-generator/src/generators/classes.js b/packages/babel-generator/src/generators/classes.js
index 1713293369..4d00272c4c 100644
--- a/packages/babel-generator/src/generators/classes.js
+++ b/packages/babel-generator/src/generators/classes.js
@@ -101,6 +101,7 @@ export function ClassProperty(node: Object) {
 }
 
 export function ClassPrivateProperty(node: Object) {
+  this.printJoin(node.decorators, node);
   if (node.static) {
     this.word("static");
     this.space();
diff --git a/packages/babel-generator/test/fixtures/decorators/private-props/input.js b/packages/babel-generator/test/fixtures/decorators/private-props/input.js
new file mode 100644
index 0000000000..2744b0c3f1
--- /dev/null
+++ b/packages/babel-generator/test/fixtures/decorators/private-props/input.js
@@ -0,0 +1,7 @@
+class A {
+  @dec
+  foo;
+
+  @dec
+  #bar;
+}
diff --git a/packages/babel-generator/test/fixtures/decorators/private-props/options.json b/packages/babel-generator/test/fixtures/decorators/private-props/options.json
new file mode 100644
index 0000000000..a91f977470
--- /dev/null
+++ b/packages/babel-generator/test/fixtures/decorators/private-props/options.json
@@ -0,0 +1,9 @@
+{
+  "plugins": [
+    ["decorators", { "decoratorsBeforeExport": false }],
+    "classProperties",
+    "classPrivateProperties",
+    "classPrivateMethods"
+  ],
+  "decoratorsBeforeExport": true
+}
diff --git a/packages/babel-generator/test/fixtures/decorators/private-props/output.js b/packages/babel-generator/test/fixtures/decorators/private-props/output.js
new file mode 100644
index 0000000000..845839ad35
--- /dev/null
+++ b/packages/babel-generator/test/fixtures/decorators/private-props/output.js
@@ -0,0 +1,6 @@
+class A {
+  @dec
+  foo;
+  @dec
+  #bar;
+}