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node_modules/next/dist/shared/lib/deep-freeze.d.ts

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+import type { DeepReadonly } from './deep-readonly';
+/**
+ * Recursively freezes an object and all of its properties. This prevents the
+ * object from being modified at runtime. When the JS runtime is running in
+ * strict mode, any attempts to modify a frozen object will throw an error.
+ *
+ * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/freeze
+ * @param obj The object to freeze.
+ */
+export declare function deepFreeze<T extends object>(obj: T): DeepReadonly<T>;