diff --git a/crates/generate/src/generate.rs b/crates/generate/src/generate.rs
index 0551bb1d..cf6d1009 100644
--- a/crates/generate/src/generate.rs
+++ b/crates/generate/src/generate.rs
@@ -505,7 +505,6 @@ fn load_js_grammar_file(grammar_path: &Path, js_runtime: Option<&str>) -> JSResu
         .wait_with_output()
         .map_err(|e| JSError::IO(format!("Failed to read output from `{js_runtime}` -- {e}")))?;
     match output.status.code() {
-        None => panic!("`{js_runtime}` process was killed"),
         Some(0) => {
             let stdout = String::from_utf8(output.stdout).map_err(|e| JSError::JSRuntimeUtf8 {
                 runtime: js_runtime.to_string(),
@@ -533,6 +532,10 @@ fn load_js_grammar_file(grammar_path: &Path, js_runtime: Option<&str>) -> JSResu
             runtime: js_runtime.to_string(),
             code,
         }),
+        None => Err(JSError::JSRuntimeExit {
+            runtime: js_runtime.to_string(),
+            code: -1,
+        }),
     }
 }
 
diff --git a/lib/binding_rust/lib.rs b/lib/binding_rust/lib.rs
index 23506e03..5e0381bb 100644
--- a/lib/binding_rust/lib.rs
+++ b/lib/binding_rust/lib.rs
@@ -351,7 +351,7 @@ impl From<ffi::TSQuantifier> for CaptureQuantifier {
             ffi::TSQuantifierZeroOrMore => Self::ZeroOrMore,
             ffi::TSQuantifierOne => Self::One,
             ffi::TSQuantifierOneOrMore => Self::OneOrMore,
-            _ => panic!("Unrecognized quantifier: {value}"),
+            _ => unreachable!(),
         }
     }
 }