1 files changed, 46 insertions, 0 deletions
diff --git a/node_modules/rollup-pluginutils/src/extractAssignedNames.ts b/node_modules/rollup-pluginutils/src/extractAssignedNames.ts
new file mode 100644
index 0000000..996f41a
--- /dev/null
+++ b/node_modules/rollup-pluginutils/src/extractAssignedNames.ts
@@ -0,0 +1,46 @@
+import { Node } from 'estree-walker';
+
+interface Extractors {
+	[key: string]: (names: Array<string>, param: Node) => void;
+}
+
+const extractors: Extractors = {
+	ArrayPattern(names: Array<string>, param: Node) {
+		for (const element of param.elements) {
+			if (element) extractors[element.type](names, element);
+		}
+	},
+
+	AssignmentPattern(names: Array<string>, param: Node) {
+		extractors[param.left.type](names, param.left);
+	},
+
+	Identifier(names: Array<string>, param: Node) {
+		names.push(param.name);
+	},
+
+	MemberExpression() {},
+
+	ObjectPattern(names: Array<string>, param: Node) {
+		for (const prop of param.properties) {
+			if (prop.type === 'RestElement') {
+				extractors.RestElement(names, prop);
+			} else {
+				extractors[prop.value.type](names, prop.value);
+			}
+		}
+	},
+
+	RestElement(names: Array<string>, param: Node) {
+		extractors[param.argument.type](names, param.argument);
+	}
+};
+
+const extractAssignedNames = function extractAssignedNames(param: Node): Array<string> {
+	const names: Array<string> = [];
+
+	extractors[param.type](names, param);
+	return names;
+};
+
+export { extractAssignedNames as default };