typecheck: allow passing a "null" scope to typeCheckInputArgs

Because almond-dialog-agent indirectly does that when typechecking predicates on their own
stanford-oval · Nov 1, 2019 · 635777d · 635777d
1 parent e9fa3a9
commit 635777d
Showing 1 changed file with 3 additions and 2 deletions.
diff --git a/lib/typecheck.js b/lib/typecheck.js
@@ -629,8 +629,9 @@ function typeCheckInputArgs(ast, schema, scope, classes) {
         if (ast.selector.isDevice) {
             let dupes = new Set;
 
-            const attrscope = scope.clone();
-            attrscope.cleanOutput();
+            const attrscope = scope ? scope.clone() : null;
+            if (attrscope)
+                attrscope.cleanOutput();
             for (let attr of ast.selector.attributes) {
                 if (dupes.has(attr.name))
                     throw new TypeError(`Duplicate device attribute ${attr.name}`);