fix: nested switch fallthrough

Author: xbwwj

src/control_flow/mod.rs

@@ -479,13 +479,25 @@ impl Visit for Analyzer<'_> {
         .iter()
         .filter_map(|case| self.get_end_reason(case.start()))
         .try_fold(
-          End::Forced {
-            ret: false,
-            throw: false,
-            infinite_loop: false,
+          (
+            End::Forced {
+              ret: false,
+              throw: false,
+              infinite_loop: false,
+            },
+            // record if previous is continue
+            false,
+          ),
+          |acc, cur| {
+            if matches!(cur, End::Continue) {
+              Some((acc.0, true))
+            } else {
+              acc.0.merge_forced(cur).map(|acc| (acc, false))
+            }
           },
-          |acc, cur| acc.merge_forced(cur),
-        );
+        )
+        // None if last is continue
+        .and_then(|(acc, last_continue)| (!last_continue).then_some(acc));
 
       match forced_end {
         Some(e) if has_default => e,

src/rules/no_fallthrough.rs

@@ -191,6 +191,23 @@ switch(someValue) {
     console.log(42);
 }
       "#,
+      r#"
+switch(foo) {
+  case true:
+    switch (bar) {
+      case true:
+      default:
+        return true;
+    }
+  default:
+    switch (bar) {
+      case true:
+        return true;
+      default:
+        return false;
+    }
+}
+      "#
     };
   }