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node_modules/buble/src/program/extractNames.js

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+export default function extractNames ( node ) {
+	const names = [];
+	extractors[ node.type ]( names, node );
+	return names;
+}
+
+const extractors = {
+	Identifier ( names, node ) {
+		names.push( node );
+	},
+
+	ObjectPattern ( names, node ) {
+		for ( const prop of node.properties ) {
+			extractors[ prop.value.type ]( names, prop.value );
+		}
+	},
+
+	ArrayPattern ( names, node ) {
+		for ( const element of node.elements )  {
+			if ( element ) extractors[ element.type ]( names, element );
+		}
+	},
+
+	RestElement ( names, node ) {
+		extractors[ node.argument.type ]( names, node.argument );
+	},
+
+	AssignmentPattern ( names, node ) {
+		extractors[ node.left.type ]( names, node.left );
+	}
+};