From 98824e7cb781ecbea493075111054d6da27a38d5 Mon Sep 17 00:00:00 2001
From: Henry Zhu <hi@henryzoo.com>
Date: Tue, 15 Aug 2017 17:01:25 -0400
Subject: [PATCH] backport the fix #6052 [skip ci]

---
 .../src/index.js                                           | 1 +
 .../test/fixtures/interop/export-destructured/actual.js    | 4 ++++
 .../test/fixtures/interop/export-destructured/expected.js  | 7 +++++++
 3 files changed, 12 insertions(+)

diff --git a/packages/babel-plugin-transform-es2015-modules-commonjs/src/index.js b/packages/babel-plugin-transform-es2015-modules-commonjs/src/index.js
index 3bc4d54db7..697ab5e8d3 100644
--- a/packages/babel-plugin-transform-es2015-modules-commonjs/src/index.js
+++ b/packages/babel-plugin-transform-es2015-modules-commonjs/src/index.js
@@ -109,6 +109,7 @@ export default function () {
       }
       else if (left.isArrayPattern()) {
         for (const element of left.node.elements) {
+          if (!element) continue;
           const name = element.name;
 
           const exports = this.exports[name];
diff --git a/packages/babel-plugin-transform-es2015-modules-commonjs/test/fixtures/interop/export-destructured/actual.js b/packages/babel-plugin-transform-es2015-modules-commonjs/test/fixtures/interop/export-destructured/actual.js
index 09c986a2d1..44169dbd66 100644
--- a/packages/babel-plugin-transform-es2015-modules-commonjs/test/fixtures/interop/export-destructured/actual.js
+++ b/packages/babel-plugin-transform-es2015-modules-commonjs/test/fixtures/interop/export-destructured/actual.js
@@ -12,3 +12,7 @@ export function f2 () {
 export function f3 () {
   [x, y, z] = [3, 4, 5]
 }
+
+export function f4 () {
+  [x, , y] = [3, 4, 5]
+}
diff --git a/packages/babel-plugin-transform-es2015-modules-commonjs/test/fixtures/interop/export-destructured/expected.js b/packages/babel-plugin-transform-es2015-modules-commonjs/test/fixtures/interop/export-destructured/expected.js
index d7015886fc..1dcd7bcb56 100644
--- a/packages/babel-plugin-transform-es2015-modules-commonjs/test/fixtures/interop/export-destructured/expected.js
+++ b/packages/babel-plugin-transform-es2015-modules-commonjs/test/fixtures/interop/export-destructured/expected.js
@@ -6,6 +6,7 @@ Object.defineProperty(exports, "__esModule", {
 exports.f1 = f1;
 exports.f2 = f2;
 exports.f3 = f3;
+exports.f4 = f4;
 let x = exports.x = 0;
 let y = exports.y = 0;
 
@@ -25,3 +26,9 @@ function f3() {
   exports.y = y;
   exports.x = x;
 }
+
+function f4() {
+  [x,, y] = [3, 4, 5];
+  exports.y = y;
+  exports.x = x;
+}