Inverse condition. Re-run the tests after restructuring code.

src/Module.js

@@ -25,7 +25,7 @@ class SyntheticDefaultDeclaration {
 
 	addReference ( reference ) {
 		// Don't change the name to `default`; it's not a valid identifier name.
-		if ( reference.name !== 'default' ) return;
+		if ( reference.name === 'default' ) return;
 
 		reference.declaration = this;
 		this.name = reference.name;