singleToArray return new frozen array

Author: compulim

packages/api/src/hooks/middleware/concatMiddleware.ts

@@ -3,7 +3,7 @@ type Enhancer<T> = (next: Work<T>) => Work<T>;
 type Middleware<Setup, Result> = (setup: Setup) => Enhancer<Result>;
 
 export default function concatMiddleware<Setup, Result>(
-  ...middleware: Middleware<Setup, Result>[]
+  ...middleware: readonly Middleware<Setup, Result>[]
 ): Middleware<Setup, Result> {
   return setupArgs => {
     const setup = middleware.reduce((setup, middleware) => {

packages/base/src/utils/singleToArray.ts

@@ -1,11 +1,8 @@
 const EMPTY_ARRAY: readonly any[] = Object.freeze([]);
 
-export default function singleToArray(singleOrArray: undefined): readonly never[];
-export default function singleToArray<T>(singleOrArray: T | T[]): readonly T[];
-
 /** @deprecated Will be removed on or after 2028-03-16. */
-export default function singleToArray<T>(singleOrArray: T | T[]): readonly T[] {
+export default function singleToArray<T>(singleOrArray: T | readonly T[]): readonly T[] {
   return typeof singleOrArray === 'undefined'
-    ? EMPTY_ARRAY
+    ? (EMPTY_ARRAY as readonly T[])
     : Object.freeze(Array.isArray(singleOrArray) ? [...singleOrArray] : [singleOrArray]);
 }