Track reassignments of array elements

src/ast/nodes/ArrayExpression.ts

@@ -5,7 +5,8 @@ import {
 	getMemberReturnExpressionWhenCalled,
 	hasMemberEffectWhenCalled,
 	ObjectPath,
-	UNKNOWN_EXPRESSION
+	UNKNOWN_EXPRESSION,
+	UNKNOWN_PATH
 } from '../values';
 import * as NodeType from './NodeType';
 import { ExpressionNode, NodeBase } from './shared/Node';
@@ -15,6 +16,13 @@ export default class ArrayExpression extends NodeBase {
 	type: NodeType.tArrayExpression;
 	elements: (ExpressionNode | SpreadElement | null)[];
 
+	bind() {
+		super.bind();
+		for (const element of this.elements) {
+			if (element !== null) element.reassignPath(UNKNOWN_PATH);
+		}
+	}
+
 	getReturnExpressionWhenCalledAtPath(path: ObjectPath) {
 		if (path.length !== 1) return UNKNOWN_EXPRESSION;
 		return getMemberReturnExpressionWhenCalled(arrayMembers, path[0]);

test/function/samples/reassign-array-literal-elements/_config.js

@@ -0,0 +1,3 @@
+module.exports = {
+	description: 'makes sure reassignments of array elements are tracked'
+};

test/function/samples/reassign-array-literal-elements/main.js

@@ -0,0 +1,8 @@
+var foo = {x: true};
+var bar = {x: true};
+var baz = [foo, bar];
+
+baz[0].x = false;
+baz[1].x = false;
+
+if (foo.x) assert.fail('foo was not reassigned');