Harden Settings using mapped types (#28775)

* Harden Settings using mapped types

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Fix issues found during hardening

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Iterate

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Iterate

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Iterate

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Remove oidc native flow stale key

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

---------

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

src/@types/common.ts

@@ -44,3 +44,11 @@ type DeepReadonlyObject<T> = {
 };
 
 export type AtLeastOne<T, U = { [K in keyof T]: Pick<T, K> }> = Partial<T> & U[keyof U];
+
+/**
+ * Returns a union type of the keys of the input Object type whose values are assignable to the given Item type.
+ * Based on https://stackoverflow.com/a/57862073
+ */
+export type Assignable<Object, Item> = {
+    [Key in keyof Object]: Object[Key] extends Item ? Key : never;
+}[keyof Object];

src/@types/json.ts

@@ -0,0 +1,13 @@
+/*
+Copyright 2024 New Vector Ltd.
+
+SPDX-License-Identifier: AGPL-3.0-only OR GPL-3.0-only
+Please see LICENSE files in the repository root for full details.
+*/
+
+export type JsonValue = null | string | number | boolean;
+export type JsonArray = Array<JsonValue | JsonObject | JsonArray>;
+export interface JsonObject {
+    [key: string]: JsonObject | JsonArray | JsonValue;
+}
+export type Json = JsonArray | JsonObject;