From e93d9940669b37bdf4183e84ad6ae6fb08f66943 Mon Sep 17 00:00:00 2001
From: Boopathi Rajaa <me@boopathi.in>
Date: Thu, 3 Nov 2016 21:31:31 +0100
Subject: [PATCH] Remove Empty Functions in block (close #247)

---
 .../__tests__/dead-code-elimination-test.js    | 18 +++++++++++++++++-
 .../src/index.js                               |  5 +++++
 2 files changed, 22 insertions(+), 1 deletion(-)

diff --git a/packages/babel-plugin-minify-dead-code-elimination/__tests__/dead-code-elimination-test.js b/packages/babel-plugin-minify-dead-code-elimination/__tests__/dead-code-elimination-test.js
index 9a9d7a22f..4eb96d171 100644
--- a/packages/babel-plugin-minify-dead-code-elimination/__tests__/dead-code-elimination-test.js
+++ b/packages/babel-plugin-minify-dead-code-elimination/__tests__/dead-code-elimination-test.js
@@ -82,7 +82,7 @@ describe("dce-plugin", () => {
     const source = unpad(`
       function foo(p) {
         return 1;
-      };
+      }
       function bar(q) {
         return q + 1;
       }
@@ -2193,4 +2193,20 @@ describe("dce-plugin", () => {
       }
     })).toBe(expected);
   });
+  it("should remove empty statements when children of block", () => {
+    const source = unpad(`
+      (function () {
+        function foo() {};
+        function bar() {};
+        function baz() {};
+        function ban() {};
+        function quux() {};
+        function cake() {};
+      })();
+    `);
+    const expected = unpad(`
+      (function () {})();
+    `);
+    expect(transform(source)).toBe(expected);
+  });
 });
diff --git a/packages/babel-plugin-minify-dead-code-elimination/src/index.js b/packages/babel-plugin-minify-dead-code-elimination/src/index.js
index e91996c9f..28d7ed53b 100644
--- a/packages/babel-plugin-minify-dead-code-elimination/src/index.js
+++ b/packages/babel-plugin-minify-dead-code-elimination/src/index.js
@@ -678,6 +678,11 @@ module.exports = ({ types: t, traverse }) => {
   return {
     name: "minify-dead-code-elimination",
     visitor: {
+      EmptyStatement(path) {
+        if (path.parentPath.isBlockStatement() || path.parentPath.isProgram()) {
+          path.remove();
+        }
+      },
       Program(path, {
         opts: {
           // set defaults