Ensure references inside default destructuring values count.

Fixes #364.

src/Statement.js

@@ -86,7 +86,7 @@ export default class Statement {
 
 				// special case – shorthand properties. because node.key === node.value,
 				// we can't differentiate once we've descended into the node
-				if ( node.type === 'Property' && node.shorthand ) {
+				if ( node.type === 'Property' && node.shorthand && parent.type !== 'ObjectPattern' ) {
 					const reference = new Reference( node.key, scope );
 					reference.isShorthandProperty = true; // TODO feels a bit kludgy
 					references.push( reference );

test/form/object-destructuring-default-values/_config.js

@@ -0,0 +1,3 @@
+module.exports = {
+  description: 'object destructuring default values are preserved'
+};

test/form/object-destructuring-default-values/_expected/amd.js

@@ -0,0 +1,9 @@
+define(function () { 'use strict';
+
+	const a = 1;
+	const b = 2;
+	const { c = a } = {};
+	const [ d = b ] = [];
+	console.log(c, d);
+
+});

test/form/object-destructuring-default-values/_expected/cjs.js

@@ -0,0 +1,7 @@
+'use strict';
+
+const a = 1;
+const b = 2;
+const { c = a } = {};
+const [ d = b ] = [];
+console.log(c, d);

test/form/object-destructuring-default-values/_expected/es6.js

@@ -0,0 +1,5 @@
+const a = 1;
+const b = 2;
+const { c = a } = {};
+const [ d = b ] = [];
+console.log(c, d);

test/form/object-destructuring-default-values/_expected/iife.js

@@ -0,0 +1,9 @@
+(function () { 'use strict';
+
+	const a = 1;
+	const b = 2;
+	const { c = a } = {};
+	const [ d = b ] = [];
+	console.log(c, d);
+
+})();

test/form/object-destructuring-default-values/_expected/umd.js

@@ -0,0 +1,13 @@
+(function (global, factory) {
+	typeof exports === 'object' && typeof module !== 'undefined' ? factory() :
+	typeof define === 'function' && define.amd ? define(factory) :
+	factory();
+}(this, function () { 'use strict';
+
+	const a = 1;
+	const b = 2;
+	const { c = a } = {};
+	const [ d = b ] = [];
+	console.log(c, d);
+
+}));

test/form/object-destructuring-default-values/main.js

@@ -0,0 +1,5 @@
+const a = 1;
+const b = 2;
+const { c = a } = {};
+const [ d = b ] = [];
+console.log(c, d);