babel-plugin-transform-class-properties: Ignore type annotations when looking for name collisions (#6082)

packages/babel-plugin-transform-class-properties/src/index.js

@@ -12,6 +12,9 @@ export default function({ types: t }) {
   };
 
   const referenceVisitor = {
+    TypeAnnotation(path) {
+      path.skip();
+    },
     ReferencedIdentifier(path) {
       if (this.scope.hasOwnBinding(path.node.name)) {
         this.collision = true;

packages/babel-plugin-transform-class-properties/test/fixtures/compile-to-class/constructor-collision-ignores-types/actual.js

@@ -0,0 +1,6 @@
+class C {
+    // Output should not use `_initialiseProps`
+    x: T;
+    y = 0;
+    constructor(T) {}
+}

packages/babel-plugin-transform-class-properties/test/fixtures/compile-to-class/constructor-collision-ignores-types/expected.js

@@ -0,0 +1,7 @@
+class C {
+  // Output should not use `_initialiseProps`
+  constructor(T) {
+    this.y = 0;
+  }
+
+}

packages/babel-plugin-transform-class-properties/test/fixtures/compile-to-class/constructor-collision-ignores-types/options.json

@@ -0,0 +1,3 @@
+{
+  "plugins": ["transform-typescript", "transform-class-properties"]
+}