From a5f63299ebdcf0523023d1dd1307979ff25c3979 Mon Sep 17 00:00:00 2001
From: "James C. Davis" <jamescdavis@gmail.com>
Date: Thu, 27 Feb 2020 15:31:23 -0500
Subject: [PATCH] TypeScript: Preserve decorated definite class properties
 (#11129)

* test: update fixture with decorated definite class property

* fix: don't remove decorated definite class properties
---
 packages/babel-plugin-transform-typescript/src/index.js      | 5 ++++-
 .../test/fixtures/class/properties/input.ts                  | 1 +
 .../test/fixtures/class/properties/output.js                 | 2 ++
 3 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/packages/babel-plugin-transform-typescript/src/index.js b/packages/babel-plugin-transform-typescript/src/index.js
index 97b23b454503..906800fec056 100644
--- a/packages/babel-plugin-transform-typescript/src/index.js
+++ b/packages/babel-plugin-transform-typescript/src/index.js
@@ -74,7 +74,9 @@ export default declare(
             );
           }
 
-          path.remove();
+          if (!node.decorators) {
+            path.remove();
+          }
         } else if (!allowDeclareFields && !node.value && !node.decorators) {
           path.remove();
         }
@@ -84,6 +86,7 @@ export default declare(
         if (node.readonly) node.readonly = null;
         if (node.optional) node.optional = null;
         if (node.typeAnnotation) node.typeAnnotation = null;
+        if (node.definite) node.definite = null;
       },
       method({ node }) {
         if (node.accessibility) node.accessibility = null;
diff --git a/packages/babel-plugin-transform-typescript/test/fixtures/class/properties/input.ts b/packages/babel-plugin-transform-typescript/test/fixtures/class/properties/input.ts
index b59f26e0c387..2aad5f4a3474 100644
--- a/packages/babel-plugin-transform-typescript/test/fixtures/class/properties/input.ts
+++ b/packages/babel-plugin-transform-typescript/test/fixtures/class/properties/input.ts
@@ -5,4 +5,5 @@ class C {
     @foo d: number;
     @foo e: number = 3;
     f!: number;
+    @foo g!: number;
 }
diff --git a/packages/babel-plugin-transform-typescript/test/fixtures/class/properties/output.js b/packages/babel-plugin-transform-typescript/test/fixtures/class/properties/output.js
index 8dd079732dbc..429cf6d41341 100644
--- a/packages/babel-plugin-transform-typescript/test/fixtures/class/properties/output.js
+++ b/packages/babel-plugin-transform-typescript/test/fixtures/class/properties/output.js
@@ -5,4 +5,6 @@ class C {
   d;
   @foo
   e = 3;
+  @foo
+  g;
 }