Fix bug in preset-env usage plugin with destructure in for-of (#6662)

experimental/babel-preset-env/src/use-built-ins-plugin.js

@@ -217,14 +217,12 @@ export default function({ types: t }: { types: Object }): Plugin {
       const obj = node.init;
 
       if (!t.isObjectPattern(node.id)) return;
-      const props = node.id.properties;
-
       if (!t.isReferenced(obj, node)) return;
 
       // doesn't reference the global
-      if (path.scope.getBindingIdentifier(obj.name)) return;
+      if (obj && path.scope.getBindingIdentifier(obj.name)) return;
 
-      for (let prop of props) {
+      for (let prop of node.id.properties) {
         prop = prop.key;
         if (
           !node.computed &&

experimental/babel-preset-env/test/fixtures/preset-options-add-used-built-ins/for-of-destructure-with/actual.js

@@ -0,0 +1,3 @@
+for (const { padStart } of foo) {
+  console.log('b'.padEnd(5));
+}

experimental/babel-preset-env/test/fixtures/preset-options-add-used-built-ins/for-of-destructure-with/expected.js

@@ -0,0 +1,8 @@
+import "@babel/polyfill/lib/core-js/modules/es7.string.pad-end";
+import "@babel/polyfill/lib/core-js/modules/es7.string.pad-start";
+
+for (const {
+  padStart
+} of foo) {
+  console.log('b'.padEnd(5));
+}

experimental/babel-preset-env/test/fixtures/preset-options-add-used-built-ins/for-of-destructure-with/options.json

@@ -0,0 +1,11 @@
+{
+  "presets": [
+    ["../../../../lib", {
+      "targets": {
+        "node": "7"
+      },
+      "useBuiltIns": "usage",
+      "modules": false
+    }]
+  ]
+}

experimental/babel-preset-env/test/fixtures/preset-options-add-used-built-ins/for-of-destructure-without/actual.js

@@ -0,0 +1,3 @@
+for (const { a } of foo) {
+  console.log(a);
+}

experimental/babel-preset-env/test/fixtures/preset-options-add-used-built-ins/for-of-destructure-without/expected.js

@@ -0,0 +1,5 @@
+for (const {
+  a
+} of foo) {
+  console.log(a);
+}

experimental/babel-preset-env/test/fixtures/preset-options-add-used-built-ins/for-of-destructure-without/options.json

@@ -0,0 +1,11 @@
+{
+  "presets": [
+    ["../../../../lib", {
+      "targets": {
+        "node": "8"
+      },
+      "useBuiltIns": "usage",
+      "modules": false
+    }]
+  ]
+}