removeClassCallCheck option

packages/babel-plugin-transform-es2015-classes/src/index.js

@@ -45,7 +45,7 @@ export default function ({ types: t }) {
         let Constructor = VanillaTransformer;
         if (state.opts.loose) Constructor = LooseTransformer;
 
-        path.replaceWith(new Constructor(path, state.file).run());
+        path.replaceWith(new Constructor(path, state.file, state.opts).run());
 
         if (path.isCallExpression() && path.get("callee").isArrowFunctionExpression()) {
           path.get("callee").arrowFunctionToExpression();

packages/babel-plugin-transform-es2015-classes/src/vanilla.js

@@ -66,7 +66,7 @@ const findThisesVisitor = visitors.merge([noMethodVisitor, {
 }]);
 
 export default class ClassTransformer {
-  constructor(path: NodePath, file) {
+  constructor(path: NodePath, file, opts) {
     this.parent = path.parent;
     this.scope = path.scope;
     this.node = path.node;
@@ -86,6 +86,7 @@ export default class ClassTransformer {
     this.pushedConstructor = false;
     this.pushedInherits = false;
     this.isLoose = false;
+    this.removeClassCallCheck = opts.removeClassCallCheck;
 
     this.superThises = [];
 
@@ -129,12 +130,14 @@ export default class ClassTransformer {
     this.buildBody();
 
     // make sure this class isn't directly called
+    if (!this.removeClassCallCheck) {
     constructorBody.body.unshift(t.expressionStatement(t.callExpression(
       file.addHelper("classCallCheck"), [
         t.thisExpression(),
         this.classRef,
       ]
     )));
+    }
 
     body = body.concat(this.staticPropBody.map((fn) => fn(this.classRef)));
 

packages/babel-plugin-transform-es2015-classes/test/fixtures/removeClassCallCheck/class/actual.js

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

packages/babel-plugin-transform-es2015-classes/test/fixtures/removeClassCallCheck/class/expected.js

@@ -0,0 +1 @@
+let A = function A() {};

packages/babel-plugin-transform-es2015-classes/test/fixtures/removeClassCallCheck/options.json

@@ -0,0 +1,8 @@
+{
+  "plugins": [
+    ["transform-es2015-classes", {
+      "removeClassCallCheck": true,
+      "loose": true
+    }]
+  ]
+}

packages/babel-plugin-transform-es2015-classes/test/fixtures/removeClassCallCheck/with-constructor/actual.js

@@ -0,0 +1,11 @@
+class A {
+  constructor() {
+    console.log('a');
+  }
+}
+
+class B {
+  b() {
+    console.log('b');
+  }
+}

packages/babel-plugin-transform-es2015-classes/test/fixtures/removeClassCallCheck/with-constructor/expected.js

@@ -0,0 +1,13 @@
+let A = function A() {
+  console.log('a');
+};
+
+let B = function () {
+  function B() {}
+
+  B.prototype.b = function b() {
+    console.log('b');
+  };
+
+  return B;
+}();