fix: MaybeArray with readonly array (#24)

fratzinger · web-flow · commit 80845bb09317 · 2026-03-06T09:10:38.000+01:00
diff --git a/src/hooks/params-for-server/params-for-server.hook.test.ts b/src/hooks/params-for-server/params-for-server.hook.test.ts
@@ -23,6 +23,28 @@ describe('paramsForServer', () => {
     })
   })
 
+  it('should accept a readonly array', () => {
+    const whitelist = ['a', 'b'] as const
+    expect(
+      paramsForServer(whitelist)({
+        params: {
+          a: 1,
+          b: 2,
+          query: {},
+        },
+      } as HookContext),
+    ).toEqual({
+      params: {
+        query: {
+          _$client: {
+            a: 1,
+            b: 2,
+          },
+        },
+      },
+    })
+  })
+
   it('should move params to query._$client and leave remaining', () => {
     expect(
       paramsForServer('a')({
diff --git a/src/internal.utils.ts b/src/internal.utils.ts
@@ -7,9 +7,9 @@ export const hasOwnProperty = (
   return keys.some((x) => Object.prototype.hasOwnProperty.call(obj, x))
 }
 
-export type MaybeArray<T> = T | T[]
-export const toArray = <T>(value: T | T[]): T[] =>
-  Array.isArray(value) ? value : [value]
+export type MaybeArray<T> = T | readonly T[]
+export const toArray = <T>(value: T | readonly T[]): T[] =>
+  Array.isArray(value) ? [...value] : [value as T]
 
 export type Promisable<T> = T | Promise<T>
 export type KeyOf<T> = Extract<keyof T, string>
