fix: Properties that are abstract should not be initialized.

packages/babel-plugin-transform-typescript/src/index.ts

@@ -160,6 +160,8 @@ export default declare((api, opts: Options) => {
             path.remove();
           }
         }
+      } else if (node.abstract) {
+        path.remove();
       } else if (!process.env.BABEL_8_BREAKING) {
         if (
           !allowDeclareFields &&

packages/babel-plugin-transform-typescript/test/fixtures/class/abstract-allowDeclareFields-false/input.ts

@@ -0,0 +1,3 @@
+abstract class A {
+    abstract prop: string;
+}

packages/babel-plugin-transform-typescript/test/fixtures/class/abstract-allowDeclareFields-false/options.json

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

packages/babel-plugin-transform-typescript/test/fixtures/class/abstract-allowDeclareFields-false/output.js

@@ -0,0 +1 @@
+class A {}

packages/babel-plugin-transform-typescript/test/fixtures/class/abstract-allowDeclareFields-true/input.ts

@@ -0,0 +1,3 @@
+abstract class A {
+    abstract prop: string;
+}

packages/babel-plugin-transform-typescript/test/fixtures/class/abstract-allowDeclareFields-true/options.json

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

packages/babel-plugin-transform-typescript/test/fixtures/class/abstract-allowDeclareFields-true/output.js

@@ -0,0 +1 @@
+class A {}

packages/babel-plugin-transform-typescript/test/fixtures/class/accessor-allowDeclareFields-false/output.js

@@ -4,11 +4,8 @@ class Foo {
   accessor #prop3 = 1;
   accessor [prop4] = 1;
   accessor prop5 = 1;
-  accessor prop6;
   accessor #p;
   accessor a;
   accessor aa;
-  accessor #s;
-  accessor f = 1;
   accessor g;
 }

packages/babel-plugin-transform-typescript/test/fixtures/class/accessor-allowDeclareFields-true-babel-7/output.js

@@ -4,5 +4,4 @@ class Foo {
   accessor #prop3 = 1;
   accessor [prop4] = 1;
   accessor prop5 = 1;
-  accessor f = 1;
 }

packages/babel-plugin-transform-typescript/test/fixtures/class/accessor-allowDeclareFields-true/output.js

@@ -4,11 +4,8 @@ class Foo {
   accessor #prop3 = 1;
   accessor [prop4] = 1;
   accessor prop5 = 1;
-  accessor prop6;
   accessor #p;
   accessor a;
   accessor aa;
-  accessor #s;
-  accessor f = 1;
   accessor g;
 }