fix: guard against undefined right

gajus · Nov 11, 2021 · c02506b · c02506b
1 parent 0a7183b
commit c02506b
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Showing 2 changed files with 5 additions and 1 deletion.
diff --git a/src/internalFilter.ts b/src/internalFilter.ts
@@ -291,6 +291,10 @@ export const internalFilter = <T extends Object>(
     highlights,
   );
 
+  if (!ast.right) {
+    throw new Error('Unexpected state.');
+  }
+
   if (ast.operator === 'OR') {
     const rightRows = internalFilter(
       ast.right,

diff --git a/src/types.ts b/src/types.ts
@@ -18,7 +18,7 @@ export type Ast = {
   range?: Range,
   regex?: boolean,
   relationalOperator?: RelationalOperator,
-  right: Ast,
+  right?: Ast,
   test?: InternalTest,
 };