/**
 * Copyright (c) 2026 AzerothJS.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 */
/**
 * Merges an addition object onto the context. `request`, `params` and `url` are readonly
 * to TypeScript and writable at runtime, so a function that returns parsed request data
 * as its additions (`app.use((c) => readJson(c.request))`) would otherwise let a body of
 * `{"params":{"id":"admin"}}` replace the path params a handler authorises on. Own keys
 * only: an addition must never arrive from a polluted prototype.
 *
 * `__proto__` is refused for the same reason from the other side: `JSON.parse` produces it as an
 * OWN key, and assigning it invokes the inherited setter, which swaps the context's prototype -
 * its `url`/`path` accessors vanish and every key never set as an own property resolves to
 * whatever the body supplied.
 *
 * @param context - The live request context.
 * @param addition - Whatever the middleware/guard returned (non-object values are ignored).
 */
export declare function mergeAdditions(context: object, addition: unknown): void;