Support asserts syntax without predicate

FIX: Allow TypeScript syntax, where the condition is just a variable. Issue #41
lezer-parser · Dec 3, 2024 · eb95618 · eb95618
1 parent 002c166
commit eb95618
Showing 1 changed file with 6 additions and 1 deletion.
diff --git a/src/javascript.grammar b/src/javascript.grammar
@@ -246,7 +246,12 @@ patternAssign {
 
 TypeAnnotation { ":" type }
 
-TypePredicate { ":" tskw<"asserts">? (VariableName | kw<"this">) !predicate tskw<"is"> type }
+TypePredicate {
+  ":" (
+     tskw<"asserts">? (VariableName | kw<"this">) (tskw<"is"> type)? |
+     (VariableName | kw<"this">) !predicate tskw<"is"> type
+  )
+}
 
 patternAssignTyped {
   pattern Optional? TypeAnnotation? ("=" expressionNoComma)?