diff --git a/eval/expression.ts b/eval/expression.ts
index f7e3c079..cdd2b097 100644
--- a/eval/expression.ts
+++ b/eval/expression.ts
@@ -101,10 +101,6 @@ class ExpressionImpl extends String implements ExpressionProps {
     this.prototype[Symbol.toStringTag] = "Expression";
   }
 
-  constructor(raw: string) {
-    super(raw);
-  }
-
   [vimExpressionOf](): string {
     return this.valueOf();
   }
diff --git a/eval/string.ts b/eval/string.ts
index 0d580971..e07f893c 100644
--- a/eval/string.ts
+++ b/eval/string.ts
@@ -136,10 +136,6 @@ class RawStringImpl extends String implements RawStringProps {
 
   #cached?: string;
 
-  constructor(raw: string) {
-    super(raw);
-  }
-
   [vimExpressionOf](): string {
     this.#cached ??= `"${
       this.valueOf().replaceAll(/\\.|(")/g, (m, q: string) => q ? `\\${q}` : m)
diff --git a/eval/use_eval.ts b/eval/use_eval.ts
index dcefbf89..6ffa66ad 100644
--- a/eval/use_eval.ts
+++ b/eval/use_eval.ts
@@ -28,7 +28,7 @@ import type { RawString } from "./string.ts";
  * }
  * ```
  */
-export async function useEval<T extends unknown>(
+export async function useEval<T>(
   denops: Denops,
   executor: (helper: UseEvalHelper) => Promise<T>,
 ): Promise<T> {