disallow reassignments to namespaces

src/Statement.js

@@ -109,33 +109,31 @@ export default class Statement {
 					const reference = new Reference( node, scope );
 					references.push( reference );
 
-					if ( node.type === 'Identifier' ) {
-						if ( parent.type in modifierNodes ) {
-							let subject = parent[ modifierNodes[ parent.type ] ];
-							let depth = 0;
-
-							while ( subject.type === 'MemberExpression' ) {
-								subject = subject.object;
-								depth += 1;
-							}
+					if ( parent.type in modifierNodes ) {
+						let subject = parent[ modifierNodes[ parent.type ] ];
+						let depth = 0;
 
-							const importDeclaration = module.imports[ subject.name ];
+						while ( subject.type === 'MemberExpression' ) {
+							subject = subject.object;
+							depth += 1;
+						}
 
-							if ( !scope.contains( subject.name ) && importDeclaration ) {
-								const minDepth = importDeclaration.name === '*' ?
-									2 : // cannot do e.g. `namespace.foo = bar`
-									1;  // cannot do e.g. `foo = bar`, but `foo.bar = bar` is fine
+						const importDeclaration = module.imports[ subject.name ];
 
-								if ( depth < minDepth ) {
-									const err = new Error( `Illegal reassignment to import '${subject.name}'` );
-									err.file = module.id;
-									err.loc = getLocation( module.magicString.toString(), subject.start );
-									throw err;
-								}
-							}
+						if ( !scope.contains( subject.name ) && importDeclaration ) {
+							const minDepth = importDeclaration.name === '*' ?
+								2 : // cannot do e.g. `namespace.foo = bar`
+								1;  // cannot do e.g. `foo = bar`, but `foo.bar = bar` is fine
 
-							reference.isReassignment = true;
+							if ( depth < minDepth ) {
+								const err = new Error( `Illegal reassignment to import '${subject.name}'` );
+								err.file = module.id;
+								err.loc = getLocation( module.magicString.toString(), subject.start );
+								throw err;
+							}
 						}
+
+						reference.isReassignment = !depth;
 					}
 
 					reference.isImmediatelyUsed = !readDepth;