diff --git a/apps/oxlint/src-js/plugins/context.ts b/apps/oxlint/src-js/plugins/context.ts
index d8e186d4e6df2..14ef77d5dfd6c 100644
--- a/apps/oxlint/src-js/plugins/context.ts
+++ b/apps/oxlint/src-js/plugins/context.ts
@@ -9,7 +9,6 @@ export interface Diagnostic {
   node: {
     start: number;
     end: number;
-    [key: string]: unknown;
   };
   fix?: FixFn;
 }
diff --git a/apps/oxlint/src-js/plugins/types.ts b/apps/oxlint/src-js/plugins/types.ts
index 55287d5383fd0..8bc4af6d68001 100644
--- a/apps/oxlint/src-js/plugins/types.ts
+++ b/apps/oxlint/src-js/plugins/types.ts
@@ -11,7 +11,7 @@ export type { Visitor };
 
 // Hook function that runs before traversal.
 // If returns `false`, traversal is skipped for the rule.
-export type BeforeHook = () => boolean | undefined;
+export type BeforeHook = () => boolean | void;
 
 // Hook function that runs after traversal.
 export type AfterHook = () => void;